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  • Hard Reset USB in Ubuntu 10.04

    - by Cory
    I have a USB device (a modem) that is really finicky. Sometimes it works fine, but other times it refuses to connect. The only solution I have found to fix it once it gets into a bad state is to physically unplug the device and plug it back in. However, I don't always have physical access to the machine it is plugged in on, so I'm looking for a way to do this through the command line. This post suggests running: $ sudo modprobe -w -r usb_storage; sudo modprobe usb_storage However I get an "unknown option -w" output. This slightly modified command: $ sudo modprobe -r usb_storage Fails with the message FATAL: Module usb_storage is in use. If I try to kill -9 the processes marked [usb-storage] before running they refuse to die (I think because they are deeply tied to the kernel). Anyone know of a way to do this? NOTE: I cross-posted this on serverfault as I didn't know which was more appropriate. I will delete and/or link whichever one is answered first.

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  • Where can someone store >100GB of pictures online? [closed]

    - by sbi
    A person who is not very computer-savvy needs to store 130GB of photos. The key parameters are: an non-negligible probability that the company selling the storage will be existing, and the data accessible, for at least five years data should be considered safe once uploaded reasonable terms of service: google drive reserving the right to literally do anything they want with their user's data is not acceptable; the possibility that the CIA might look at those pictures is not considered a threat easy to use from Windows, preferably as a drive no nerve-wracking limitations ("cannot upload 10GB/day" or "files 500MB" etc.) that serve no purpose other than pushing the user to the next-higher price plan some upgrade plan: there's currently 10-30GB of new photos per year, with a tendency to increase, which might bust a 150GB limit next January ability to somehow sort the pictures: currently they are sorted into folders, but something alike (tags) would be just as good, if easy enough to apply of course, the pricing is important (although there's a reason this is the last bullet; reasonable data safety is considered more important) Nice to have, but not necessary features would be: additional features related to photos (thumbnail generation, album sharing etc.) access from web and other platforms than Windows (smart phones) Let me stress this again: The person in need of that is able to copy pictures from the camera to the computer, can copy files in the explorer, and uses a web email service. That's about it, there's almost no understanding of what happens under the hood.

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  • Hard Reset USB in Ubuntu 10.04

    - by Cory
    I have a USB device (a modem) that is really finicky. Sometimes it works fine, but other times it refuses to connect. The only solution I have found to fix it once it gets into a bad state is to physically unplug the device and plug it back in. However, I don't always have physical access to the machine it is plugged in on, so I'm looking for a way to do this through the command line. This post suggests running: $ sudo modprobe -w -r usb_storage; sudo modprobe usb_storage However I get an "unknown option -w" output. This slightly modified command: $ sudo modprobe -r usb_storage Fails with the message FATAL: Module usb_storage is in use. If I try to kill -9 the processes marked [usb-storage] before running they refuse to die (I think because they are deeply tied to the kernel). Anyone know of a way to do this? NOTE: I cross-posted this on serverfault as I didn't know which was more appropriate. I will delete and/or link whichever one is answered first.

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  • ZFS Data Loss Scenarios

    - by Obtuse
    I'm looking toward building a largish ZFS Pool (150TB+), and I'd like to hear people experiences about data loss scenarios due to failed hardware, in particular, distinguishing between instances where just some data is lost vs. the whole filesystem (of if there even is such a distinction in ZFS). For example: let's say a vdev is lost due to a failure like an external drive enclosure losing power, or a controller card failing. From what I've read the pool should go into a faulted mode, but if the vdev is returned the pool should recover? or not? or if the vdev is partially damaged, does one lose the whole pool, some files, etc.? What happens if a ZIL device fails? Or just one of several ZILs? Truly any and all anecdotes or hypothetical scenarios backed by deep technical knowledge are appreciated! Thanks! Update: We're doing this on the cheap since we are a small business (9 people or so) but we generate a fair amount of imaging data. The data is mostly smallish files, by my count about 500k files per TB. The data is important but not uber-critical. We are planning to use the ZFS pool to mirror 48TB "live" data array (in use for 3 years or so), and use the the rest of the storage for 'archived' data. The pool will be shared using NFS. The rack is supposedly on a building backup generator line, and we have two APC UPSes capable of powering the rack at full load for 5 mins or so.

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  • Exchange IMAP4 connector - Error Event ID 2006

    - by MikeB
    Hi, A couple of users in my organisation use IMAP4 to connect to Exchange 2007 (Update rollup 9 applied) because they prefer Thunderbird / Postbox clients. One of the users is generating errors in the Application Log as follows: An exception Microsoft.Exchange.Data.Storage.ConversionFailedException occurred while converting message Imap4Message 1523, user "*******", folder *********, subject: "******", date: "*******" into MIME format. Microsoft.Exchange.Data.Storage.ConversionFailedException: Message content has become corrupted. ---> System.ArgumentException: Value should be a valid content type in the form 'token/token' Parameter name: value at Microsoft.Exchange.Data.Mime.ContentTypeHeader.set_Value(String value) at Microsoft.Exchange.Data.Storage.MimeStreamWriter.WriteHeader(HeaderId type, String data) at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimeStreamAttachment(StreamAttachmentBase attachment, MimeFlags flags) --- End of inner exception stack trace --- at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimeStreamAttachment(StreamAttachmentBase attachment, MimeFlags flags) at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimeAttachment(MimePartInfo part, MimeFlags flags) at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimePart(MimePartInfo part, MimeFlags mimeFlags) at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimeParts(List`1 parts, MimeFlags mimeFlags) at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimePart(MimePartInfo part, MimeFlags mimeFlags) at Microsoft.Exchange.Data.Storage.ImapItemConverter.<>c__DisplayClass2.<WriteMimePart>b__0() at Microsoft.Exchange.Data.Storage.ConvertUtils.CallCts(Trace tracer, String methodName, String exceptionString, CtsCall ctsCall) at Microsoft.Exchange.Data.Storage.ImapItemConverter.WriteMimePart(ItemToMimeConverter converter, MimeStreamWriter writer, OutboundConversionOptions options, MimePartInfo partInfo, MimeFlags conversionFlags) at Microsoft.Exchange.Data.Storage.ImapItemConverter.GetBody(Stream outStream) at Microsoft.Exchange.Data.Storage.ImapItemConverter.GetBody(Stream outStream, UInt32[] indices) From my reading around it seems that the suggestion is to ask users to log in to Outlook / OWA and view the messages there. However, having logged in as the users myself, the messages cannot be found either through searching or by browsing the folder detailed in the log entry. The server returns the following error to the client: "The message could not be retrieved using the IMAP4 protocol. The message has not been deleted and may be accessible using either Microsoft Outlook or Microsoft Office Outlook Web Access. You can also try contacting the original sender of the message to find out about the contents of the message. Retrieval of this message will be retried when the server is updated with a fix that addresses the problem." Messages were transferred in to Exchange by copying them from the old Apple Xserve, accessed using IMAP. So my question, finally: 1. Is there any way to get the IMAP Exchange connector to rebuild its cache of messages since it doesn't seem to be pulling them directly from the MAPI store? 2. Alternatively, if there is no database, any ideas on why these messages don't appear in Outlook or OWA would be gratefully received. Many thanks, Mike

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  • Exchange IMAP4 connector - Error Event ID 2006

    - by MikeB
    A couple of users in my organisation use IMAP4 to connect to Exchange 2007 (Update rollup 9 applied) because they prefer Thunderbird / Postbox clients. One of the users is generating errors in the Application Log as follows: An exception Microsoft.Exchange.Data.Storage.ConversionFailedException occurred while converting message Imap4Message 1523, user "*******", folder *********, subject: "******", date: "*******" into MIME format. Microsoft.Exchange.Data.Storage.ConversionFailedException: Message content has become corrupted. ---> System.ArgumentException: Value should be a valid content type in the form 'token/token' Parameter name: value at Microsoft.Exchange.Data.Mime.ContentTypeHeader.set_Value(String value) at Microsoft.Exchange.Data.Storage.MimeStreamWriter.WriteHeader(HeaderId type, String data) at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimeStreamAttachment(StreamAttachmentBase attachment, MimeFlags flags) --- End of inner exception stack trace --- at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimeStreamAttachment(StreamAttachmentBase attachment, MimeFlags flags) at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimeAttachment(MimePartInfo part, MimeFlags flags) at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimePart(MimePartInfo part, MimeFlags mimeFlags) at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimeParts(List`1 parts, MimeFlags mimeFlags) at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimePart(MimePartInfo part, MimeFlags mimeFlags) at Microsoft.Exchange.Data.Storage.ImapItemConverter.<>c__DisplayClass2.<WriteMimePart>b__0() at Microsoft.Exchange.Data.Storage.ConvertUtils.CallCts(Trace tracer, String methodName, String exceptionString, CtsCall ctsCall) at Microsoft.Exchange.Data.Storage.ImapItemConverter.WriteMimePart(ItemToMimeConverter converter, MimeStreamWriter writer, OutboundConversionOptions options, MimePartInfo partInfo, MimeFlags conversionFlags) at Microsoft.Exchange.Data.Storage.ImapItemConverter.GetBody(Stream outStream) at Microsoft.Exchange.Data.Storage.ImapItemConverter.GetBody(Stream outStream, UInt32[] indices) From my reading around it seems that the suggestion is to ask users to log in to Outlook / OWA and view the messages there. However, having logged in as the users myself, the messages cannot be found either through searching or by browsing the folder detailed in the log entry. The server returns the following error to the client: "The message could not be retrieved using the IMAP4 protocol. The message has not been deleted and may be accessible using either Microsoft Outlook or Microsoft Office Outlook Web Access. You can also try contacting the original sender of the message to find out about the contents of the message. Retrieval of this message will be retried when the server is updated with a fix that addresses the problem." Messages were transferred in to Exchange by copying them from the old Apple Xserve, accessed using IMAP. So my question, finally: 1. Is there any way to get the IMAP Exchange connector to rebuild its cache of messages since it doesn't seem to be pulling them directly from the MAPI store? 2. Alternatively, if there is no database, any ideas on why these messages don't appear in Outlook or OWA would be gratefully received. Many thanks, Mike

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  • LocalStorage storing multiple div hides

    - by Jesse Toxik
    I am using a simple code to hide multiple divs if the link to hide them is clicked. On one of them I have local storage set-up to remember of the div is hidden or not. The thing is this. How can I write a code to make local storage remember the hidden state of multiple divs WITHOUT having to put localstorage.setItem for each individual div. Is it possible to store an array with the div ids and their display set to true or false to decide if the page should show them or not? **********EDITED************ function ShowHide(id) { if(document.getElementById(id).style.display = '') { document.getElementById(id).style.display = 'none'; } else if (document.getElementById(id).style.display = 'none') { document.getElementById(id).style.display = ''; }

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  • ORM on iPhone. More simple than CoreData.

    - by Alexander Babaev
    The question is rather simple. I know that there is SQLite. There is Core Data also. But I need something in between. More object-oriented than SQLite API and simplier than Core Data. Main points are: I need access to stored entities only by id. No queries required. I need to store items of a single type, it means that I can use only one table if I choose SQLite. I want automatic object-relational conversion. Or object-storage if the storage is not relational. I can use object archiving, but I have to implement things (NSArchiver). But I want to write some kind of class and get persistence automatically. As it can be done with Hibernate/ActiveRecord/Core Data/etc. Thanks.

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  • ServiceBus WorkerRole DiagnosticMonitor Error

    - by user1596485
    I have a WebRole and 2 ServiceBus WorkerRoles running, During the OnStart of the roles I get the following Exception: [System.ArgumentOutOfRangeException] invalid syntax for container log4net Parameter name: initialConfiguration Running Azure: ConfigurationManager version=1.7.0.3 ServiceBus version=1.7.0.1 Storage version=1.7.0.0 This occurs while running locally in the dev Azure environment and in the Cloud. All roles have the following Configurtion settings: <LocalStorage name="Log4Net" cleanOnRoleRecycle="true" sizeInMB="2048" /> All Roles have the following code in the OnStart: try { // Configure Disgnostics to poll Log file to Blob Storage var diagnosticsConfig = DiagnosticMonitor.GetDefaultInitialConfiguration(); diagnosticsConfig.Directories.ScheduledTransferPeriod = TimeSpan.FromMinutes(5); diagnosticsConfig.Directories.DataSources.Add( new DirectoryConfiguration { Path = RoleEnvironment.GetLocalResource("Log4Net").RootPath, DirectoryQuotaInMB = 512, Container = "wad-WebRolelog4net" }); DiagnosticMonitor.Start("Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString", diagnosticsConfig); } catch { OnStop(); return false; }

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  • How to reliably map vSphere disks <-> Linux devices

    - by brianmcgee
    Task at hand After a virtual disk has been added to a Linux VM on vSphere 5, we need to identify the disks in order to automate the LVM storage provision. The virtual disks may reside on different datastores (e.g. sas or flash) and although they may be of the same size, their speed may vary. So I need a method to map the vSphere disks to Linux devices. Ideas Through the vSphere API, I am able to get the device info: Data Object Type: VirtualDiskFlatVer2BackingInfo Parent Managed Object ID: vm-230 Property Path: config.hardware.device[2000].backing Properties Name Type Value ChangeId string Unset contentId string "d58ec8c12486ea55c6f6d913642e1801" datastore ManagedObjectReference:Datastore datastore-216 (W5-CFAS012-Hybrid-CL20-004) deltaDiskFormat string "redoLogFormat" deltaGrainSize int Unset digestEnabled boolean false diskMode string "persistent" dynamicProperty DynamicProperty[] Unset dynamicType string Unset eagerlyScrub boolean Unset fileName string "[W5-CFAS012-Hybrid-CL20-004] l****9-000001.vmdk" parent VirtualDiskFlatVer2BackingInfo parent split boolean false thinProvisioned boolean false uuid string "6000C295-ab45-704e-9497-b25d2ba8dc00" writeThrough boolean false And on Linux I may read the uuid strings: [root@lx***** ~]# lsscsi -t [1:0:0:0] cd/dvd ata: /dev/sr0 [2:0:0:0] disk sas:0x5000c295ab45704e /dev/sda [3:0:0:0] disk sas:0x5000c2932dfa693f /dev/sdb [3:0:1:0] disk sas:0x5000c29dcd64314a /dev/sdc As you can see, the uuid string of disk /dev/sda looks somehow familiar to the string that is visible in the VMware API. Only the first hex digit is different (5 vs. 6) and it is only present to the third hyphen. So this looks promising... Alternative idea Select disks by controller. But is it reliable that the ascending SCSI Id also matches the next vSphere virtual disk? What happens if I add another DVD-ROM drive / USB Thumb drive? This will probably introduce new SCSI devices in between. Thats the cause why I think I will discard this idea. Questions Does someone know an easier method to map vSphere disks and Linux devices? Can someone explain the differences in the uuid strings? (I think this has something to do with SAS adressing initiator and target... WWN like...) May I reliably map devices by using those uuid strings? How about SCSI virtual disks? There is no uuid visible then... This task seems to be so obvious. Why doesn't Vmware think about this and simply add a way to query the disk mapping via Vmware Tools?

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  • juju bootstrap fails with a local environment, why?

    - by Braiam
    Each time I try to bootstrap juju using a local enviroment it fails starting the juju-db-braiam-local script as follows: $ sudo juju --debug --verbose bootstrap 2013-10-20 02:28:53 INFO juju.provider.local environprovider.go:32 opening environment "local" 2013-10-20 02:28:53 DEBUG juju.provider.local environ.go:210 found "10.0.3.1" as address for "lxcbr0" 2013-10-20 02:28:53 DEBUG juju.provider.local environ.go:234 checking 10.0.3.1:8040 to see if machine agent running storage listener 2013-10-20 02:28:53 DEBUG juju.provider.local environ.go:237 nope, start some 2013-10-20 02:28:53 DEBUG juju.environs.tools storage.go:87 Uploading tools for [raring precise] 2013-10-20 02:28:53 DEBUG juju.environs.tools build.go:109 looking for: juju 2013-10-20 02:28:53 DEBUG juju.environs.tools build.go:150 checking: /usr/bin/jujud 2013-10-20 02:28:53 INFO juju.environs.tools build.go:156 found existing jujud 2013-10-20 02:28:53 INFO juju.environs.tools build.go:166 target: /tmp/juju-tools243949228/jujud 2013-10-20 02:28:53 DEBUG juju.environs.tools build.go:217 forcing version to 1.14.1.1 2013-10-20 02:28:53 DEBUG juju.environs.tools build.go:37 adding entry: &tar.Header{Name:"FORCE-VERSION", Mode:420, Uid:0, Gid:0, Size:8, ModTime:time.Time{sec:63517832933, nsec:278894120, loc:(*time.Location)(0x108fda0)}, Typeflag:0x30, Linkname:"", Uname:"ubuntu", Gname:"ubuntu", Devmajor:0, Devminor:0, AccessTime:time.Time{sec:63517832933, nsec:278894120, loc:(*time.Location)(0x108fda0)}, ChangeTime:time.Time{sec:63517832933, nsec:278894120, loc:(*time.Location)(0x108fda0)}} 2013-10-20 02:28:53 DEBUG juju.environs.tools build.go:37 adding entry: &tar.Header{Name:"jujud", Mode:493, Uid:0, Gid:0, Size:19179512, ModTime:time.Time{sec:63517832933, nsec:274894120, loc:(*time.Location)(0x108fda0)}, Typeflag:0x30, Linkname:"", Uname:"ubuntu", Gname:"ubuntu", Devmajor:0, Devminor:0, AccessTime:time.Time{sec:63517832933, nsec:274894120, loc:(*time.Location)(0x108fda0)}, ChangeTime:time.Time{sec:63517832933, nsec:274894120, loc:(*time.Location)(0x108fda0)}} 2013-10-20 02:28:55 INFO juju.environs.tools storage.go:106 built 1.14.1.1-raring-amd64 (4196kB) 2013-10-20 02:28:55 INFO juju.environs.tools storage.go:112 uploading 1.14.1.1-precise-amd64 2013-10-20 02:28:55 INFO juju.environs.tools storage.go:112 uploading 1.14.1.1-raring-amd64 2013-10-20 02:28:55 INFO juju.environs.tools tools.go:29 reading tools with major version 1 2013-10-20 02:28:55 INFO juju.environs.tools tools.go:34 filtering tools by version: 1.14.1.1 2013-10-20 02:28:55 INFO juju.environs.tools tools.go:37 filtering tools by series: precise 2013-10-20 02:28:55 DEBUG juju.environs.tools storage.go:41 reading v1.* tools 2013-10-20 02:28:55 DEBUG juju.environs.tools storage.go:61 found 1.14.1.1-precise-amd64 2013-10-20 02:28:55 DEBUG juju.environs.tools storage.go:61 found 1.14.1.1-raring-amd64 2013-10-20 02:28:55 INFO juju.environs.boostrap bootstrap.go:57 bootstrapping environment "local" 2013-10-20 02:28:55 INFO juju.environs.tools tools.go:29 reading tools with major version 1 2013-10-20 02:28:55 INFO juju.environs.tools tools.go:34 filtering tools by version: 1.14.1.1 2013-10-20 02:28:55 INFO juju.environs.tools tools.go:37 filtering tools by series: precise 2013-10-20 02:28:55 DEBUG juju.environs.tools storage.go:41 reading v1.* tools 2013-10-20 02:28:55 DEBUG juju.environs.tools storage.go:61 found 1.14.1.1-precise-amd64 2013-10-20 02:28:55 DEBUG juju.environs.tools storage.go:61 found 1.14.1.1-raring-amd64 2013-10-20 02:28:55 DEBUG juju.provider.local environ.go:395 create mongo journal dir: /home/braiam/.juju/local/db/journal 2013-10-20 02:28:55 DEBUG juju.provider.local environ.go:401 generate server cert 2013-10-20 02:28:55 INFO juju.provider.local environ.go:421 installing service juju-db-braiam-local to /etc/init 2013-10-20 02:28:56 ERROR juju.provider.local environ.go:423 could not install mongo service: exec ["start" "juju-db-braiam-local"]: exit status 1 (start: Job failed to start) 2013-10-20 02:28:56 ERROR juju supercommand.go:282 command failed: exec ["start" "juju-db-braiam-local"]: exit status 1 (start: Job failed to start) error: exec ["start" "juju-db-braiam-local"]: exit status 1 (start: Job failed to start) What is the reason for this error and how to solve it?

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  • ???????????????????2(???????)

    - by rika.tokumichi
    ??????OTN????????? ?????????????????????????????/????????????Developers Summit?(????)???????? >???????????????????1 ???????????? ???????????????2??????????? ??????????????2?????????·????????? ???3??????????????????????··· ?????????????1??????????????????????·????(Oracle Automatic Storage Management: Oracle ASM)??? ???????????? ?????????????????????????????????????????????????????! (??????????????^^) ---------------------------------- ¦?????·????(Storage GRID) ?????????????????? ????????????I/A??????????????????????????????????????? ???????????????????????????????????????? Storage GRID????????????????????????????????????????????????????? Developers Summit 2010?????Storage GRID??????????????? Storage GRID??????? Storage GRID??????????????????????????????????? ????????????????????????????????? ?????????????????????????? ??????????????/????? ??????????????????????????(?????)??????????????????????? ????????????????????????????????????? ??????????????????????????????????? ?????????????????Oracle ASM(Automatic Storage Management)?? Storage GRID?????????????????????ASM????????????????????? ASM?Grid Infrastructure?????????????????????Grid Infrastructure????????????????????Grid Infrastructure?????????????????????????????? ????OS?????Oracle Unbreakable Linux?????????????????? ??????????????1??????????Oracle Database Enterprise Edition???Oracle Database Standard Edition????????????????????????????? ????????????????????Oracle Clusterware????????????????1???2???????????????????????????Oracle Clusterware??????????????????? ?????????????????????????????? ????????????Oracle????????????? Storage GRID?????????????????????????????????????????????? Storage GRID????????????????????????????????????????????????????????????????I/O????????? ????????????????????????????????????????????????????I/O????????????????????????????????????????????????????????? ????????I/O????????????????????????????????????????????????????????????H/W?????????????????????????CPU ????????????????????????????????????????????????TCO????????????????? Storage GRID????????????????????????????????????????????????? ??OTN-Japan?????Grid Infrastructure???????????????????????????? >Grid Infrastructure??????????? 1)OTN??????????????????????Oracle Database 11g Release2???????????????????????????????????? 2)??????????????????????????????????????????????????Grid Infrastructure??????????????????????? ???????? Developers Summit 2010(????2010)??Web??? ?????????? ??????????????2?????????·????????????? ---------------------------------- ??????????????????????????? ????????????????????????????·?????????????????????????????I/A?????????????????????????????????????????Oracle ASM??????????????????Oracle Database 11g R2???????????????Oracle VM ???????????????????????????????????????! nkjmkzk.net >???????????????????? >Oracle 11g R2??????OEL 5.4 VM?????? ???··· ¦OTN?????????????????????????? >Oracle Database 11g R2?????Oracle VM?????????????NEW? ??????10?30????????????Oracle VM Forum 2009???????????????? >????????????????????????????????! ?????··· Oracle VM?????? Oracle VM???????????????????? Part1|Part2 ???????????? ---------------------- ??????????????! OTN???????????????????????????????????????????????????????????? >???????????????????1 ????????????

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  • Symantec BE: How is data flow of backups/restore to storage pools?

    - by Kumala
    I am evaluating Symantec's BackupExec 2012 and was wondering how does the backup data flow from the server that as being backed up to the storage pool. E.g. My BE server is in city A, the server that I am backing up is in city B and the storage pool that I plan to use is also located in city B. When performing a backup, does the backup data flow from the server in city B to the BE server in city A and back to the storage pool in city B or is it possible to have the backup data go directly from server in city B to storage pool in city B?

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  • How to configure multiple iSCSI Portal Groups on a EqualLogic PS6100?

    - by kce
    I am working on a migration from a VMware vSphere environment to a Hyper-V Cluster utilizing Windows Server 2012 R2. The setup is pretty small, an EqualLogic PS6100e and two Dell PowerConnect 5424 switches and handful of R710s and R620s. The SAN was configured as a non-RFC1918 network that is not assigned to our organization and since I am working on building a new virtualization environment I figured that this would be an appropriate time to do a subnet migration. I configured a separate VLAN and subnet on the switches and the two previously unused NICs on the PS6100's controllers. At this time I only have a single Hyper-V host cabled in but I can successfully ping the PS6100 from the host. From the PS6100 I can ping each of the four NICs that currently on the storage network. I cannot connect the Microsoft iSCSI Initiator to the Target. I have successfully added the Target Portals (the IP addresses of PS6100 NICs) and the Targets are discovered but listed as inactive. If I try to Connect to them I get the following error, "Log onto Target - Connection Failed" and ISCSIPrt 1 and 70 events are recorded in the Event Log. I have verified that access control to the volume is not the problem by temporarily disabling it. I suspect the problem is with the Portal Group IP address which is still listed as Group Address of old subnet (I know, I know I might be committing the sin of the X/Y problem but everything else looks good): RFC3720 has this to say about Network Portal and Portal Groups: Network Portal: The Network Portal is a component of a Network Entity that has a TCP/IP network address and that may be used by an iSCSI Node within that Network Entity for the connection(s) within one of its iSCSI sessions. A Network Portal in an initiator is identified by its IP address. A Network Portal in a target is identified by its IP address and its listening TCP port. Portal Groups: iSCSI supports multiple connections within the same session; some implementations will have the ability to combine connections in a session across multiple Network Portals. A Portal Group defines a set of Network Portals within an iSCSI Network Entity that collectively supports the capability of coordinating a session with connections spanning these portals. Not all Network Portals within a Portal Group need participate in every session connected through that Portal Group. One or more Portal Groups may provide access to an iSCSI Node. Each Network Portal, as utilized by a given iSCSI Node, belongs to exactly one portal group within that node. The EqualLogic Group Manager documentation has this to say about the Group IP Address: You use the group IP address as the iSCSI discovery address when connecting initiators to iSCSI targets in the group. If you modify the group IP address, you might need to change your initiator configuration to use the new discovery address Changing the group IP address disconnects any iSCSI connections to the group and any administrators logged in to the group through the group IP address. Which sounds equivalent to me (I am following up with support to confirm). I think a reasonable explanation at this point is that the Initiator can't complete the connection to the Target because the Group IP Address / Network Portal is on a different subnet. I really want to avoid a cutover and would prefer to run both subnets side-by-side until I can install and configure each Hyper-V host. Question/s: Is my assessment at all reasonable? Is it possible to configure multiple Group IP Addresses on the EqualLogic PS6100? I don't want to just change it as it will disconnect the remaining ESXi hosts. Am I just Doing It Wrong(TM)?

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  • Should server spare parts be stored in climate controlled storage?

    - by Shane Wealti
    What is a best practice for storing server spares (hard drives, RAM, power supplies, etc) with respect to how/where they are stored? Some options are storing them in climate controlled storage or just a standard warehouse-type stockroom? My understanding is that all other things being equal climate-controlled storage is preferred. What are the risks of storing that type of thing in a non-climate-controlled, somewhat dusty shelving area? Conversely are there risks to storing spares in a climate controlled area? If there are space limitations in climate controlled storage are there some parts, such as hard drives, which should be in climate controlled, while other parts such as power supplies will probably be ok in non climate controlled storage?

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  • Best NIC config when virtual servers need iSCSI storage?

    - by icky2000
    I have a Windows 2008 server running Hyper-V. There are 6 NICs on the server configured like this: NIC01 & NIC02: teamed administrative interface (RDP, mgmt, etc) NIC03: connected to iSCSI VLAN #1 NIC04: connected to iSCSI VLAN #2 NIC05: dedicated to one virtual switch for VMs NIC06: dedicated to another virtual switch for VMs The iSCSI NICs are used obviously for storage to host the VMs. I put half the VMs on the host on the switch assigned to NIC05 and the other half on the switch assigned to NIC06. We have multiple production networks that the VMs could appear on so the switch ports that NIC05 & NIC06 are connected to are trunked and we then tag the NIC on the VM for the appropriate VLAN. No clustering on this host. Now I wish to assign some iSCSI storage direct to a VM. As I see it I have 2 options: Add the iSCSI VLANs to the trunked ports (NIC05 and NIC06), add two NICs to the VM that needs iSCSI storage, and tag them for the iSCSI VLANs Create two additional virtual switches on the host. Assign one to NIC03 and one to NIC04. Add two NICs to the VM that needs iSCSI storage and let them share that path to the SAN with the host. I'm wondering about how much overhead the VLAN tagging in Hyper-V has and haven't seen any discussion about that. I'm also a bit concerned that something funky on the iSCSI-connected VM could saturate the iSCSI NICs or cause some other problem that could threaten storage access for the entire host which would be bad. Any thoughts or suggestions? How do you configure your hosts when VMs connect direct to iSCSI?

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  • Open source embedded filesystem (or single file virtual filesystem, or structured storage) library f

    - by Ioan
    I'm not sure what the "general" name of something like this might be. I'm looking for a library that gives me a file format to store different types of binary data in an expanding single file. open source, non-GPL (LGPL ok) C interface the file format is a single file multiple files within using a POSIX-like file API (or multiple "blobs" within using some other API) file/structure editing is done in-place reliable first, performant second Examples include: the virtual drives of a virtual machine whefs HDF CDF NetCDF Problems with the above: whefs doesn't appear to be very mature, but best describes what I'm after HDF, CDF, NetCDF are usable (also very reliable and fast), but they're rather complicated and I'm not entirely convinced of their support for opaque binary "blobs" Edit: Forgot to mention, one other relevant question: http://stackoverflow.com/questions/1361560/simple-virtual-filesystem-in-c-c Another similar question: http://stackoverflow.com/questions/374417/is-there-an-open-source-alternative-to-windows-compound-files Edit: Added condition of in-place editing.

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  • Silverlight 4.0: How to increase quota in Isolated File Storage

    - by xscape
    Got this line of code here but its not working. using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication()) { long newSpace = isf.Quota + spaceRequest; try { if(true == isf.IncreaseQuotaTo(newSpace)) { Debug.WriteLine("success"); } else { Debug.WriteLine("unsuccessful"); } } catch (Exception e) { throw; } }

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  • Seperation of notification confirmation+storage and handling notification asp.net mvc

    - by bastijn
    After a payment from my web application to a 3rd party the 3rd party sends, next to the direct confirmation message, a notification message. This notification message is stored in my database for future use and I have to send a notification confirmed back. For this purpose I currently use a: return Content("received") Which is standard protocol for the service. Currently, I process the incoming notification by first storing it, than handling it (updating account credits etc in my application) and in the end sending a response. This all works well. But I want to seperate handling the notification and storing+responding to the webservice. The problem is that the "return Content()" is ending my controller method and therefore I cannot simply first send the confirmation message back to the webservice and than call my handle_Notification() method. So the solution would be to replace the return Content() part with something equal which doesn't involve a "return", is this possible, as I do not now the complete URL calling I cannot easily create a simple HTTP POST web request (I tried, might have made an error but did not work). Another solution would be to have some kind of timer or listener which either periodically checks for new notifications in the Database which have to be handled or a listener listening to DB new notifications or something. What is the standard procedure on this, if any?

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  • PHP: optimum configuration storage ?

    - by Jerome WAGNER
    Hello, My application gets configured via a lot of key/values (let's say 30.000 for instance) I want to find the best deployment method for these configurations, knowing that I want to avoid DEFINEs to allow for runtime re-configuration. I have thought of - pre-compiling them into an array via a php file - pre-compiling them into a tmpfs sqlite database - pre-compiling them into a memcached db what are my options for the best random access time to these configuration (memory is not an issue) ? Thanks Jerome

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  • Is SHA-1 secure for password storage?

    - by Tgr
    Some people throw around remarks like "SHA-1 is broken" a lot, so I'm trying to understand what exactly that means. Let's assume I have a database of SHA-1 password hashes, and an attacker whith a state of the art SHA-1 breaking algorithm and a botnet with 100,000 machines gets access to it. (Having control over 100k home computers would mean they can do about 10^15 operations per second.) How much time would they need to find out the password of any one user? find out the password of a given user? find out the password of all users? find a way to log in as one of the users? find a way to log in as a specific user? How does that change if the passwords are salted? Does the method of salting (prefix, postfix, both, or something more complicated like xor-ing) matter? Here is my current understanding, after some googling. Please correct in the answers if I misunderstood something. If there is no salt, a rainbow attack will immediately find all passwords (except extremely long ones). If there is a sufficiently long random salt, the most effective way to find out the passwords is a brute force or dictionary attack. Neither collision nor preimage attacks are any help in finding out the actual password, so cryptographic attacks against SHA-1 are no help here. It doesn't even matter much what algorithm is used - one could even use MD5 or MD4 and the passwords would be just as safe (there is a slight difference because computing a SHA-1 hash is slower). To evaluate how safe "just as safe" is, let's assume that a single sha1 run takes 1000 operations and passwords contain uppercase, lowercase and digits (that is, 60 characters). That means the attacker can test 1015*60*60*24 / 1000 ~= 1017 potential password a day. For a brute force attack, that would mean testing all passwords up to 9 characters in 3 hours, up to 10 characters in a week, up to 11 characters in a year. (It takes 60 times as much for every additional character.) A dictionary attack is much, much faster (even an attacker with a single computer could pull it off in hours), but only finds weak passwords. To log in as a user, the attacker does not need to find out the exact password; it is enough to find a string that results in the same hash. This is called a first preimage attack. As far as I could find, there are no preimage attacks against SHA-1. (A bruteforce attack would take 2160 operations, which means our theoretical attacker would need 1030 years to pull it off. Limits of theoretical possibility are around 260 operations, at which the attack would take a few years.) There are preimage attacks against reduced versions of SHA-1 with negligible effect (for the reduced SHA-1 which uses 44 steps instead of 80, attack time is down from 2160 operations to 2157). There are collision attacks against SHA-1 which are well within theoretical possibility (the best I found brings the time down from 280 to 252), but those are useless against password hashes, even without salting. In short, storing passwords with SHA-1 seems perfectly safe. Did I miss something?

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