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• Unable to write DVD-R(Blank DVD's)

  - by FrozenKing

  I have a problem in dvd drive i.e. It can read CD/DVD and can write CD and all CD/DVD-RW but cannot write DVD DVD drive model is SH-S203B Samsung; I also have a log file created by nero burning rom 11. Actually the fact is no Blank DVD's are being read in my dvd drive only previously written dvd's can be read! Is this the problem of OS or should I try cleaning the dvd drive or my DVD drive is 4yrs old so is it going to spoil now, since it is showing this type of symptoms! OS = WinXP AV = KIS 2012 DVD Drive = Samsung SH-S203B (Also tried latest firmware and downgrade versions also) IA32 Nero Version: 11.2.4.100 Internal Version: 11,2,4,100 Recorder: <TSSTcorp CDDVDW SH-S203B>Version: SB04 - HA 1 TA 0 - 11.2.4.100 Adapter driver: <Serial ATA> HA 1 Drive buffer : 2048kB Bus Type : via Inquiry data CD-ROM: <TSSTcorp CDDVDW SH-S203B >Version: SB04 - HA 1 TA 0 - 11.2.4.100 Adapter driver: <Serial ATA> HA 1 18:58:10 #37 SPTI -1511 File SCSIPassThrough.cpp, Line 224 CdRom0: SCSIStatus(x02) WinError(0) NeroError(-1511) CDB Data: 0x28 00 00 00 00 00 00 00 10 00 Sense Key: 0x04 (KEY_HARDWARE_ERROR) Sense Code: 0x3E Sense Qual: 0x02 Sense Area: 0x70 00 04 00 00 00 00 0A 00 00 00 00 3E 02 Buffer x08047340: Len x8000 18:58:10 #38 SectorVerify 20 File Cdrdrv.cpp, Line 12057 Read errors from sector 0 to 14 <Padding> 18:58:19 #39 SPTI -1511 File SCSIPassThrough.cpp, Line 224 CdRom0: SCSIStatus(x02) WinError(0) NeroError(-1511) CDB Data: 0x28 00 00 00 00 10 00 00 10 00 Sense Key: 0x04 (KEY_HARDWARE_ERROR) Sense Code: 0x3E Sense Qual: 0x02 Sense Area: 0x70 00 04 00 00 00 00 0A 00 00 00 00 3E 02 Buffer x08047340: Len x8000 18:58:19 #40 SectorVerify 21 File Cdrdrv.cpp, Line 12057 Read error at sector 15 <Virtual Multisession Info> 18:58:19 #41 SectorVerify 20 File Cdrdrv.cpp, Line 12057 Read errors from sector 16 to 18 <Volume Structure Descriptor Sequence> 18:58:28 #42 SPTI -1511 File SCSIPassThrough.cpp, Line 224 CdRom0: SCSIStatus(x02) WinError(0) NeroError(-1511) CDB Data: 0x28 00 00 00 00 20 00 00 10 00 Sense Key: 0x04 (KEY_HARDWARE_ERROR) Sense Code: 0x3E Sense Qual: 0x02 Sense Area: 0x70 00 04 00 00 00 00 0A 00 00 00 00 3E 02 Buffer x08047340: Len x8000

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• SSRS2008R2 report times out, but the underlying query executes in the Management Studio

  - by Matthew Belk

  A customer of mine recently moved servers and the new server has SQL2008R2. His old server was SQL2005. The new server has substantially better CPU, RAM, and disk performance than the old, but several reports time out while executing. When I run the underlying query in the SQL Management Studio, the query executes in sub-second time. The exact error message returned via the Report Manager UI is: An error occurred within the report server database. This may be due to a connection failure, timeout or low disk condition within the database. (rsReportServerDatabaseError) Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. It must be noted that this database is not just analytical; it's also fairly transactional, although the transaction volume is not exceptionally high. What can I do to improve the performance of the SSRS query engine? Are there settings in the data source I can adjust, or in the SSRS config files?

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• Virtual Fileserver

  - by Sergei

  Hi, We are planning to move our production servers to the datacenter and virtualize remaining servers in the process.Datacenter will have HP blades with vSphere on top.Currentliy we are using Celerra NS20 as fileserver.Since datacenter is using HP kit and EVA 4400 as SAN, we cannot have Celerra there, as EMC supoprt for Celerra does not work for non EMC array. I have searched for possible options and one of them was to have HP NAS blade X3800sb instead of Celerra.However this seems like overkill for me.We are only using Celerra for about 100 users and 50 servers and I think having X3800sb could be waste of resources. The other option would be to have a virtual fileserver as a part of vmware environment in datacenter.We only need CIFS to be provided.The only option I can think of is Windows Storage server.We had a bad expirience with Windows servers used as fileservers ( memory leaks one thing) in the past and this was one of the reasons we moved to Celerra. What are the other options?We need something as reliable as Celerra with as many options as possible.For example , Celerra has per folder quotas, deduplication, dynamic volume allocation, automatic failover, VTLU, replication. Also we would need to replicate NAS data to the failover site.We could use block level replication , SAN-to-SAN, but this would mean wasted bandwidth, as we need only subset of folders to be replicated.We used CA XSoft for windows servers in the past and Celerra has option for Celerra replication. Thank you very much in advance, Please ask me if I missed any details!

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• Best way to attach 96 tb to workstation

  - by user994179

  I'm running a workstation with dual xeon 5690's (12 physical/24 logical cores), 192 gb of ram (ie, maxed-out), Windows 7 64bit, 5 slots for adapter cards, and 1 tb of internal storage, with 5 more internal bays available. I have an app that creates data files totaling about 88 tbs. These are written once every 14 months, and the rest of the time the app only needs to read them; and 95% of the reads are sequential reads of huge chunks of data. I have some control over how big the individual files are, but ideally they would be between 5 and 8 tbs. The app will be reading from only one drive at a time, and the nature of the data is such that if (when) a drive dies I can restore the data to a new disk from tape. While it would be nice to be able to use the fastest drive/controllers available, at this point size matters more than speed. After doing lots of reading, I am leaning toward buying a bunch of cheap 2tb drives and putting them into a bunch of cheap enclosures. All this stuff is going into my home office, so I need to avoid the raised floor/refrigerated approach. My questions: Is the cheap drive/enclosure solution the best one for this situation? Given the nature of the app and the way the data is used, does RAID make sense? If so, which one? For huge sequential reads, would Usb 3.0 and eSata be a wash performance-wise? For each slot available on the workstation, can I hook up an enclosure that can hold multiple drives? Or is it one controller per drive? If I can have multiple drives on one controller, am I essentially splitting the bandwidth (throughput)? For example, if I have a 12 bay enclosure, is the throughput of the controller reduced by a factor of 12? Are there any Windows 7 volume/drive/capacity limits I should be aware of? Thanks

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• Wastage of resources in Virtualization

  - by Sabeen Malik

  I have asked this question on SO, but was suggested that i ask it here on SF, so here it goes. http://stackoverflow.com/questions/3010753/wastage-of-resources-in-virtualization I am not sure if this is the right place to ask the question. However i hope it is. When looking for a VPS earlier today, I was trying to understand how each container would work in the background. Keeping in mind the fact that the operating system uses most of the memory and power on a system, wouldn't having multiple operating systems in the same machine mean more wastage of resources. For instance if i was running centOS on a dedicated box and it was running lets say 20 background OS level processes. Then i go and install a virtualization platform and install 5 more centOS virtual machines in the same system which are exactly the same as the host operating system. Doesn't this mean duplication of those 20 processes 6 times? So internally the context switching is happening between 120 processes instead of 20? Further Notes: Here is an example of what i am thinking: I have a master-slave configuration for a long running, cpu + memory intensive process, which can be distributed to 4 machines. Lets say when the process runs on these 4 machines with lets say 1 Gh CPU and 1 Gig RAM, i get 400 results per hour from the cluster (assuming 100 results from one machine) . Now i get a bigger machine ( lets say 4Gh and 4 Gig RAM), have 4 virtual hosts on it with 1 Gz CPU and 1 Gig RAM. Will this configuration give me the same 4 results per hour from these 4 virtual hosts?

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• Speakers silent, headphones work in Ubuntu 9.04

  - by CarlF

  I'm running Ubuntu 9.04. Worked fine for months, then I rebooted yesterday after weeks of continuous operation. Now audio won't play through the speakers. The USB headset works fine, but the Conexant audio (CX20549) does not. Weirdly, it thinks it's playing. pavumeter shows appropriate levels, volume looks OK in alsamixer, but no sound. I did find this page: http://www.eugeneteplitsky.com/fixing-silent-pulseaudio-in-ubuntu-9-04/ Unfortunately the advice there doesn't help me. For one thing, the syntax for the alsa-base.conf file is apparently not actually documented anywhere. For another, my chipset isn't listed in the kernel.org docs he links to! EDIT: would upgrading to 9.10 help? Is there a major change in the audio subsystem between 9.04 and 9.10? Any suggestions? EDIT 2: This is stranger than I thought. Sound works normally in Xine, but is silent in Audacity, VLC and mplayer. What the?

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• ESX hosts lose connectivity with iSCSI SAN LUNs

  - by Themist

  I've been experiencing this issue for a couple of months now where my ESX hosts lose connectivity with my iSCSI SAN vmfs volumes. As a results the ESX hosts enter a nonresponsive mode the associated VMs disconnect and the only remedy is to reboot the host. This issue happens randomly . I have escalated this issue with VMWare but I haven't had any solution to the issue yet. I see no errors on my switches and there are no hardware issues as well. My SAN infrastucture is solid and there are 2 paths for every vmfs volume. Did anybody else experienced a similar issue? edit: Here are some more details: The iSCSI SAN software is Datacore Sanmelody 2.0.4.2 running on 2 HP Proliant G5 servers. The storage attached to each of the servers is an HP MSA70 and all the iSCSI SAN Volumes that are presented to my 4 ESX hosts are mirrored. I have two iSCSI swithces HP Procurve 1800G-24 that are trunked together. My SANLELODY servers are using NC360T NICs. I team two NICs and have one cable connecting to each iSCSi switch. Each ESX server uses two NICs as well for the iSCSI Network.

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• HAproxy with MySQL Master-Master Replication incredibly slow

  - by Yayap

  I have two MySQL servers in multi-master mode, with an HAproxy machine for simple load balancing/redundancy. When I am connected to one of the servers directly and try to update about 100,000 entries, it is completed including replication in about half a minute. When connecting through the proxy it takes usually over three whole minutes. Is it normal to have that type of latency? Is something amiss with my proxy configuration (included below)? This is getting really frustrating as I assumed the proxy would do some sort of load balancing, or at least have little to no overhead. #--------------------------------------------------------------------- # Example configuration for a possible web application. See the # full configuration options online. # # http://haproxy.1wt.eu/download/1.4/doc/configuration.txt # #--------------------------------------------------------------------- #--------------------------------------------------------------------- # Global settings #--------------------------------------------------------------------- global # to have these messages end up in /var/log/haproxy.log you will # need to: # # 1) configure syslog to accept network log events. This is done # by adding the '-r' option to the SYSLOGD_OPTIONS in # /etc/sysconfig/syslog # # 2) configure local2 events to go to the /var/log/haproxy.log # file. A line like the following can be added to # /etc/sysconfig/syslog # # local2.* /var/log/haproxy.log # log 127.0.0.1 local2 # chroot /var/lib/haproxy # pidfile /var/run/haproxy.pid maxconn 4096 user haproxy group haproxy daemon #debug #quiet # turn on stats unix socket stats socket /var/lib/haproxy/stats #--------------------------------------------------------------------- # common defaults that all the 'listen' and 'backend' sections will # use if not designated in their block #--------------------------------------------------------------------- defaults mode tcp log global #option tcplog option dontlognull option tcp-smart-accept option tcp-smart-connect #option http-server-close #option forwardfor except 127.0.0.0/8 #option redispatch retries 3 #timeout http-request 10s #timeout queue 1m timeout connect 400 timeout client 500 timeout server 300 #timeout http-keep-alive 10s #timeout check 10s maxconn 2000 listen mysql-cluster 0.0.0.0:3306 mode tcp balance roundrobin option tcpka option httpchk server db01 192.168.15.118:3306 weight 1 inter 1s rise 1 fall 1 server db02 192.168.15.119:3306 weight 1 inter 1s rise 1 fall 1

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• vmware vmdk disk problem

  - by dmtr

  Hello, I have a vmware esxi 4 server and 2 storage servers (mount as nfs). Between the storage servers (fedora 14) is made drbd cluster (dual primary) and ocfs2 filesystem, also every server has local partition with ext4 filesystem, both are mounted as nfs on esxi server. When i tried to copy a virtual machine (naturally it power off) files from ext4 partition to ocfs2 partition, vmdk total file size is different, but md5sum is the same. on ext4 partition: # ls -la total 28492228 -rw------- 1 root root 42949672960 Jan 14 14:46 disk-flat.vmdk # md5sum disk-flat.vmdk 0eaebe3138beb32f54ea5de6dfe5a987 on ocfs2 partition: # ls -la total 13974660 -rw------- 1 root root 42949672960 Jan 14 16:16 disk-flat.vmdk # md5sum disk-flat.vmdk 0eaebe3138beb32f54ea5de6dfe5a987 When i power on the virtual machine from ocfs2 partition it dosn't work. I have a windows on the virtual machine and it freez?s after windows logo. From ext4 partition the virtual machine is worked. Test with linux (create and install on ext4 partition and copy) the same problem appears. When i create a virtual machine directly from ocfs2 partition, there are no problems. I tried to copy via vSphere client, and i have the same problem. Any suggestions ?

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• Exchange 2010 DAG + VMWare HA = no support?

  - by Dan

  We currently have an Exchange 2003 clustered environment (two machine cluster) that we're looking to upgrade to 2010. We recently purchased a VMWare virtualization environment (three Dell R710's with an EMC NS-120 serving up NFS datastores - iSCSI is available) that we wish to use for this new environment. I'm seeing that Microsoft does not support Exchange 2010 DAGs with a virtualization high availability solution (see links below). I would like to utilize the DAG to ensure the data stays available if one host goes down, and HA to ensure that if the physical host goes down, the VM will come back up on the other available host. Does anybody know why MS does not support this? VMWare HA will only restart the VM if it is hung/down - I don't see any difference between this and restarting the physical box if someone pulled the power... Will we only run into issues with support if it has something to do with HA/DAG failover or will they see we have HA and tell us to put it on a physical box even if it has nothing to do with HA? If we disable HA for these VM's will that satisfy them on a support case? Has anybody set up an Exchange 2010 DAG on VMware with HA enabled? Will they have any issues with using an NFS datastore? We have much greater flexibility on the EMC with NFS vs iSCSI, so I would prefer to continue utilizing that. Thanks for any input! http://www.vmwareinfo.com/2010/01/verifying-microsoft-exchange-2010.html Take a look at the second image under "Not Supported" http://technet.microsoft.com/en-us/library/aa996719.aspx "Microsoft doesn't support combining Exchange high availability solutions (database availability groups (DAGs)) with hypervisor-based clustering, high availability, or migration solutions. DAGs are supported in hardware virtualization environments provided that the virtualization environment doesn't employ clustered root servers."

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• Mac OS X Disk Encryption - Automation

  - by jfm429

  I want to setup a Mac Mini server with an external drive that is encrypted. In Finder, I can use the full-disk encryption option. However, for multiple users, this could become tricky. What I want to do is encrypt the external volume, then set things up so that when the machine boots, the disk is unlocked so that all users can access it. Of course permissions need to be maintained, but that goes without saying. What I'm thinking of doing is setting up a root-level launchd script that runs once on boot and unlocks the disk. The encryption keys would probably be stored in root's keychain. So here's my list of concerns: If I store the encryption keys in the system keychain, then the file in /private/var/db/SystemKey could be used to unlock the keychain if an attacker ever gained physical access to the server. this is bad. If I store the encryption keys in my user keychain, I have to manually run the command with my password. This is undesirable. If I run a launchd script with my user credentials, it will run under my user account but won't have access to the keychain, defeating the purpose. If root has a keychain (does it?) then how would it be decrypted? Would it remain locked until the password was entered (like the user keychain) or would it have the same problem as the system keychain, with keys stored on the drive and accessible with physical access? Assuming all of the above works, I've found diskutil coreStorage unlockVolume which seems to be the appropriate command, but the details of where to store the encryption key is the biggest problem. If the system keychain is not secure enough, and user keychains require a password, what's the best option?

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• Recover NTFS data from a ZFS pool that was exposed as an iSCSI target

  - by David

  This was me being stupid and the data is by no means critical and is now a learning experience first, time saver second. I set up a 100GB iSCSI target via the bare bone instructions in napp-it. It's a volume LU. I then had my Windows 7 machine connect to the iSCSI target, formatted it to NTFS, and tested the performance of it with some large iso file transfers. I then unmapped the drive, reconnected to the target, and was forced to format to NTFS again. It was then I realized the files I had transferred only existed on the iSCSI target. I threw a little fit and then went about my business. When I was cleaning up my experiment I noticed in this screen: http://imgur.com/1xlcu.jpg That is my experimental target tank/iSCSI and it still has a lot of data in it. Assuming my isos are still in this pool how would I go about recovering them? While writing this I used GetDataBackup for NTFS from www.runtime.org. And while it found two previous NTFS partitions there was no data.

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• Find out when a system went down?

  - by Clinton Blackmore

  I have a Mac OS X 10.5 server, with a RAID set in it, that went down due to a power outage on Thursday, and the machine is not happily booting right now*. It is possible to find out when the machine went down, while not booted off the internal drive? (I'm booted off an external drive, waiting for the RAID sets to initialize.) Normally, I'd run last. The man page doesn't indicate that I can run it against a different startup volume. It looks possible to parse /var/log/utmpx, but I don't think it'd be worthwhile to try to do that from scratch for this one-off problem. * I'm still trying to figure out why it isn't happy, and may ask a follow-up question. Right now I can see that UserNotificationCenter crashed repeatedly early Thursday morning, and that securityd, mdworker, and ARDAgent crash shortly after startup [I think -- I want to verify when the box went up and down]. The login window does not come up right (I think it is crashing or not able to cope with a dead securityd). The box is supposed to be set to go down when the UPS tells it power is out; at the moment, I'm wondering if it went down, and turned back on multiple times! I sure hope not.

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• Feasibility of Windows Server 2008 DFS replication over WAN link

  - by CesarGon

  We have just set up a WAN link that connects two buildings in our organisation. The link is provided by a 100-Mbps point to point line. We have a Windows Server 2008 R2 domain controller on each side of the link. Now we are planning to set up DFS for file services across the organisation. The estimated data volume is over 2 TB, and will grow at approximately 20% annually. My idea is to set up a file server in each building and install DFS so that all the contents stay replicated over the 100-Mbps link. I hope that this will ensure that any user will be directed to the closest (and fastest) server when requesting a file from the DFS folders. My concern is whether a 100-Mbps WAN link is good enough to guarantee DFS replication. I've no experience with DFS, so any solid advice is welcome. The line is reliable (i.e. it doesn't crash often) and our data transfer tests show that a 5 MB/sec transfer rate is easily achieved. This is approximately 40% of the nominal bandwidth. I am also concerned about the latency. I mean, how long will users need to wait to see one change on one side of the link after the change has been made on the other side. My questions are: Is this link between networks a reliable infrastructure on which to set up DFS replication? What latency times would be typical (seconds, minutes, hours, days)? Would you recommend that we go for DFS in this scenario, or is there a better alternative? Many thanks.

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• Terrible noises from subwoofer of ACER Aspire 6930 with Realtek sound chip

  - by OneWorld

  After approximately 5-15 min of listening to music my subwoofer begins to make terrible noises. He's just "coughing". That began after 6 months I had this computer. Now I found out, that I can temporarily fix this problem by "restarting" the audio stream of the application that plays music. For example reloading last.fm page (reloads the flash file). Another way to reset the audio playback is switching the speaker configuration shown below in the screenshot. According to many posts on the internet like http://www.tomshardware.co.uk/forum/52918-20-acer-aspire-6935g-speaker-problem ACER support isn't any help Exchanging hardware doesn't fix the problem Even the later models have this problem Turning off the volume of the subwoofer is not an option to me. I still have warranty (I bought an extension of one year). I already tried about 15 versions of the Realtek driver with no success. I am not sure but MAYBE the problem did not occur on the original windows vista that was shipped with this computer. However, I removed the original windows for good reasons (english). What do you suggest me? Did anyone fix this problem? Maybe by writing a script which resets the audio streams every 5 minutes? Shall I take the effort to deal with the acer support until they give me another model? (I won't have a computer than for a longer time, will spend money on telephone hotlines (1,30 EUR / min)......) Here are additional infos, if they are any help: Windows 7 64 Bit (Original was Windows Vista Home Premium 32 Bit) All specs Audio driver version:

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• Drobo-like linux file server - how do I do it?

  - by John Hunt

  I've been pondering for a long time about how I can set up a server which operates much like the Drobo storage thing. The reasons I don't actually want a drobo is because I've heard scare stories, plus I'd like to do this on the cheap. So ideally I'm looking for something like lvm so I can create a logical volume that spans many hard disks of varying sizes... obviously that only offers redundancy if I put the LV on a raid array (as far as I know..) I have however been reading about technologies such as Microsoft's drive extender which duplicates files at the filesystem level and makes sure that the mirrored files are on a different phyiscal disk.. does anyone know or recommend a filesystem or method like this as it'll hopefully make much better use of the space available than raid ever could. Performance isn't an issue, I'd just really like to make the most of the hard disks I have lying around whilst having a bit of redundancy incase a disk dies. I understand full well that this is no replacement for a backup, but I'll only be storing files of medium importance and using the nas itself as a backup of my main pc and other systems. Thanks in advance! I'm hoping zfs or btrfs or something can do something clever for me :)

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• Exchange backup verification shows no files

  - by Olaf

  [SBS2003SP2] If i read the exhange log it shows the backup contains no files just folders and the total size seems to be Ok. I i try to restore the folders are empty... But the 14 files that where backupped dissapeared in the verification log?! Other backups on the same medium turned out to be fine. Any idea what's wrong here? This is my log: Backup Status Operation: Backup Active backup destination: File Media name: "testbackup.bkf created 2-6-2010 at 11:25" Volume shadow copy creation: Attempt 1. Backup of "SERVER1\Microsoft Information Store\First Storage Group" Backup set #1 on media #1 Backup description: "Set created 2-6-2010 at 11:25" Media name: "testbackup.bkf created 2-6-2010 at 11:25" Backup Type: Normal Backup started on 2-6-2010 at 11:26. Backup completed on 2-6-2010 at 12:21. Directories: 4 Files: 14 Bytes: 26.842.932.104 Time: 55 minutes and 38 seconds Verify Status Operation: Verify After Backup Active backup destination: File Active backup destination: \backup\Server1\Backup Files\testbackup.bkf Verify of "SERVER1\Microsoft Information Store\First Storage Group" Backup set #1 on media #1 Backup description: "Set created 2-6-2010 at 11:25" Verify started on 2-6-2010 at 12:21. Verify completed on 2-6-2010 at 12:47. Directories: 4 Files: 0 Different: 0 Bytes: 26.842.932.104 Time: 25 minutes and 46 seconds

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• LVM and cloning HDs

  - by jcea

  Using Linux, I have several backup levels. One of them is a periodical sector by sector copy (using dd) of my laptop harddisk to an external USB disk. Yes, I have other backups too, like remote rsync. This approach (the disk dd) is OK when cloning a HDD with no LVM volumes, since I can plug the external disk anytime and mount the partitions simply mounting /dev/sdb* instead of /dev/sda*. Trivial and handy. Today I moved ALL my harddisk (including the /boot) to LVM. Everything works fine. I will stress it for a couple of days, and then I will do a sector by sector copy to my external harddisk. Now I have a problem, I guess. If in the future I plug the external USB HDD to recover any file, the OS will detect a duplicate LVM configuration, with the same name and the same UUID. Even doing a vgrename (which LVM would be renamed, the internal HDD or the external HDD?), the cloned UUID will not change. Is there any command to change name and UUID? Ideally I would clone the HDD and then change the LVM group name and its UUID, but I don't know how to do it. Another related issue would be... In the past I have booted my laptop using the external disk, using the BIOS boot menu and changing GRUB entries manually to boot from /dev/sdb instead of /dev/sda. But now my current GRUB configuration boots directly from a LVM logical volume, something like: set root='(LVM-root)' in my grub.cfg. So... What is going to happen with duplicated volumes? Any suggestion? I guess I could repartition my external harddisk and change backup strategy from dd to rsync, but this disk has windows installed too, and I really would like to have a physical "real" copy.

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• 530 5.7.1 Client was not authenticated Exchange 2010 for some computers within mask

  - by user1636309

  We have a classic problem with Client not Authenticated but with a specific twist: We have an Exchange 2010 cluster, let's say EX01 and EX02, the connection is always to smtp.acme.com, then it is switched through load balancer. We have an application server, call it APP01 There are clients connected to the APP01. There is a need for anonymous mail relay from both clients and APP01. The Anonymous Users setting of the Exchange is DISABLED, but the specific computers - APP01 and clients by the mask, let's say, 192.168.2.* - are enabled. For internal relay, a "Send Connector" is created, and then the above IP addresses are added for the connector to allow computers, servers, or any other device such as a copy machine to use the exchange server to relay email to recipients. The problem is that the relay works for APP01 and some clients, but not others (we get "Client not Authenticated") - all inside the same network and the same mask. This is basically what we do to test it outside of our application: http://smtp25.blogspot.sk/2009/04/530-571-client-was-not-authenticated.html So, I am looking for ideas: What can be the reason for such a strange behaviour? Where I can see the trace of what's going on at the Exchange side?

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• Nginx and automatic updates

  - by Desmond Hume

  I'm on Ubuntu 12.04.1 with unattended-upgrades configured for automatic security updates, and I installed Nginx by first adding deb http://nginx.org/packages/ubuntu/ lucid nginx deb-src http://nginx.org/packages/ubuntu/ lucid nginx to /etc/apt/sources.list file, just as was suggested by the official wiki, and then by sudo apt-get update sudo apt-get install nginx which installed Nginx with all the standard modules. But now I think I could make good use of one or two of the Nginx optional modules, like the gzip precompression module or some security-related one. So far, I see two ways of adding an optional module to Nginx, one is compiling and installing from the source code and the other is described in this article. So, which of the ways should I choose so that automatic updates still run for and apply to Nginx and its optional modules? Or should I create a cron job with a command/script specific for Nginx instead of using unattended-upgrades utility? Can I choose between volume updates and security-only updates to be automatically applied to the standard and optional modules? And finally, is there a possibility to automatically update Nginx's modules on the fly (without any connections having been dropped), like the documentation suggests it's possible with sudo kill -USR2 $( cat /run/nginx.pid ) P.S. Actually I'm not certain if unattended-upgrades utility would automatically update the standard modules in the first place, not enough time has passed since Nginx was installed to say for sure.

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• Recommendations for handling Directory Harvesting spam on Exchange 2003

  - by Aaron Alton

  Our Exchange server is getting slammed with anywhere between 450,000 and 700,000 spam messages per day. We receive about 1700 legitimate messages in the same time frame. Roughly 75% of the spam is directory harvesting. We currently have GFI MailEssentials installed. To it's credit, it's doing a very good job, but the sheer volume of spam that we're receiving, and the number of connections that our exchange server is making is preventing legitimate email from being delivered in a timely manner. GFI is set up to check for directory harvesting at the SMTP level, which I presume intercepts the mail before it hits the Exchange services , or goes through SMSE. This "module" is ordered at the top of the list, so (hopefully) dealing with the harvesting is consuming a minimum amount of server resources and bandwidth. My question is, is there anything I can do to prevent our Exchange server's connection pool from being eaten up by these spam hosts? We had to limit the number of concurrent connections being made by Exchange, because it was consuming all of our bandwidth. Thanks, in advance.

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• hdfs configuration

  - by Ananymous

  I am a newbie. Trying to setup a hdfs system to serve my data (I don't plan to use mapreduce) at my lab. So far I have read, cluster setup in but I am still confused. Several questions: Do I need to have a secondary namenode? There are 2 files, masters and slaves. Do I really need these 2 files eventhough I just want hdfs? If I need them, what should go in there? I assume my namenode in masters and datanodes as slaves? Do I need slaves nodes What configuration files are needed for namenode, secondary namenode, datanode and client? (I assume core-site.xml is needed for all 4)? In addition, can someone suggest a good configuration model? sample configuration for namenode, secondary namenode, datanode, and the client would be very helpful. I am getting confused because it seems most of the documentation assumes I want to use map-reduce which isn't the case.

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• Backing up SQL NetApp Snapshots using TSM

  - by WerkkreW

  In our environment we have a 3 node SQL 2005 Cluster which is on NetApp storage. We are currently using SMSQL (NetApp SnapManager for SQL) to take Snapshot backups of the data. This works great, but due to some audit requirements we are also forced to maintain some copies on tape. We have used NDMP in other places across the enterprise but we do not want to use it in this specific instance. Basically what I need to do is, get the most recent snapshot copy of the databases on tape, via Tivoli Storage Manager (TSM). What I have done is, obtained a basic Windows Server 2003 VM with SnapDrive installed, which is SAN attached and zoned to the NetApp, and I have written a batch file to do the following: Mount the latest __RECENT snapshot lun to the host, using a specific drive letter Perform a TSM based incremental backup Dis-mount the LUN This seems to work fine, except sometimes the LUN's do not mount due to some sort of timeout. Also, due to my limited knowledge of windows batch scripting, I have no way to monitor the success or failure of these backups since I do not know how to send a valid return code back to the TSM scheduling service. Is there a more efficient/elegant way to accomplish this without NDMP?

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• running chkdsk /F on a large mounted NTFS image file gets BSOD (Windows Vista)

  - by Citizentools

  Using ddrescue, I've created ISO files from the C: and D: drives on my Windows XP laptop's harddisk (after the laptop stopped booting and chkdsk etc. wouldn't fix it). I was able to mount the 60 GB D.iso file use OSFmount, and successfully recreated the D: drive on another laptop. The C.iso image is more problematic. ddrescue left about 3mb unrecovered of 85 GB total, after multiple passes (no big worries about this) and I'm able to mount it with OSFmount on a Windows Vista laptop. However, when I run chkdsk /F /V on the mounted drive (which was mounted as H:), I consistently get a blue screen (BSOD). CHKDSK makes it through the first three passes, including index fixing and security descriptor fixes, without errors, but triggers a BSOD when it attempts to fix the volume records or bitmap If I attempt to fix the drive by clicking on Properties-Tools-Error checking-Check Now-Automatically fix file system errors, I get an alert box reading "WIndows was unable to complete the disk check." I'd try a tool other than OSFMount, but it's the only thing I've found so far that will mount large ISO files, and it has worked for me up to now in this process. [Update 2011-11-13 18:41 EST] Just ran the same process using the original Windows XP laptop, with a different internal drive, and chkdsk worked like a champ. So the question is still interesting, but decidedly less urgent.

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• Distortion problem with Creative audio equalizer

  - by e-t172

  Hi, I have a problem with the Creative Console EQ, I don't know if it's fixable or not (is the EQ software or hardware on these cards?). Basically, I have enormous distortion with certain sounds in the 30 - 125 hz range. When this happens I get some sort of "frrzzzz" (sorry, I'm french and don't really know the correct english word for that) on top of the original sound. I have a Sound Blaster Audigy SE. I'm using the Daniel_K drivers, on Windows 7 Profesionnal x64. All the effects are disabled except EQ. Steps to reproduce Put the card in 24bit/96khz mode. The problem is also present with 16bit/48khz but seems to be less audible. In the Creative Console, use the following EQ: (full size) Play this sound at a reasonably high volume. You should hear distortion on the two "booms". Especially the second one. Disable Creative EQ. Play the sound in an application with an integrated EQ (e.g. foobar2000, ffdshow) using the same EQ parameters. There is no distortion. Conclusion: the Creative EQ is broken. Is anyone having the same problem? I'm also interested in the results with other Creative cards or even other brands soundcards with a similar EQ feature.

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