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• Four disks - RAID 10 or two mirrored pairs?

  - by ewwhite

  I have this discussion with developers quite often. The context is an application running in Linux that has a medium amount of disk I/O. The servers are HP ProLiant DL3x0 G6 with four disks of equal size @ 15k rpm, backed with a P410 controller and 512MB of battery or flash-based cache. There are two schools of thought here, and I wanted some feedback... 1). I'm of the mind that it makes sense to create an array containing all four disks set up in a RAID 10 (1+0) and partition as necessary. This gives the greatest headroom for growth, has the benefit of leveraging the higher spindle count and better fault-tolerance without degradation. 2). The developers think that it's better to have multiple RAID 1 pairs. One for the OS and one for the application data, citing that the spindle separation would reduce resource contention. However, this limits throughput by halving the number of drives and in this case, the OS doesn't really do much other than regular system logging. Additionally, the fact that we have the battery RAID cache and substantial RAM seems to negate the impact of disk latency... What are your thoughts?

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• Dell OMCI: Wacky values for Temperature and etc? (Win7x64)

  - by Yablargo

  Hey All. I am running a Dell Precision R5400 Workstation with dell OMCI installed. I am using it to test polling various data over WMI for our monitoring across the enterprise. I'm getting some weird results. perhaps someone can help point me in the direction of some clarification? Posted is the results of my DCIM\SYSMAN\DCIM_NumericSensor probe for sensor type 2(temp sensor) Microsoft (R) Windows Script Host Version 5.8 Copyright (C) Microsoft Corporation. All rights reserved. ----------------------------------- DCIM_NumericSensor instance ----------------------------------- Accuracy: AccuracyUnits: AdditionalAvailability: Availability: AvailableRequestedStates: BaseUnits: 2 Caption: CommunicationStatus: CreationClassName: DCIM_NumericSensor CurrentReading: -214748365 CurrentState: Unknown Description: DetailedStatus: DeviceID: Root/MainSystemChassis/TemperatureObj ElementName: Temperature Sensor:CPU0 EnabledDefault: 2 EnabledState: 2 EnabledThresholds: ErrorCleared: ErrorDescription: HealthState: 5 Hysteresis: IdentifyingDescriptions: InstallDate: IsLinear: LastErrorCode: LocationIndicator: LowerThresholdCritical: LowerThresholdFatal: LowerThresholdNonCritical: MaxQuiesceTime: MaxReadable: MinReadable: Name: NominalReading: NormalMax: NormalMin: OperatingStatus: OperationalStatus: 2 OtherEnabledState: OtherIdentifyingInfo: OtherSensorTypeDescription: PollingInterval: PossibleStates: Unknown,Normal,Fatal,Lower Non-Critical,Upper Non-Critical,Lower Critical,Upper Critical PowerManagementCapabilities: PowerManagementSupported: PowerOnHours: PrimaryStatus: ProgrammaticAccuracy: RateUnits: 0 RequestedState: 12 Resolution: SensorType: 2 SettableThresholds: Status: StatusDescriptions: StatusInfo: SupportedThresholds: SystemCreationClassName: DCIM_ComputerSystem SystemName: dt:5Q7BKK1 TimeOfLastStateChange: Tolerance: TotalPowerOnHours: TransitioningToState: 12 UnitModifier: 0 UpperThresholdCritical: UpperThresholdFatal: UpperThresholdNonCritical: ValueFormulation: 2 I'm not really sure whats going on, but note the CurrentReading: -214748365. I have reinstalled OMCI a few times, installed the OMCI 7x compatability and same thing I consistently get that error. It almost looks like its a issue between 32/64 bit value or something? Do I have to convert it to a float ? :)

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• GlusterFS as elastic file storage?

  - by Christopher Vanderlinden

  Is there any way to run GlusterFS in a replicated mode, but with the ability to dynamically scale the volume up and down? Say you have 3 servers all running glusterd. your Gluster volume would have to be setup with replica 3 gluster volume create test-volume replica 3 192.168.0.150:/test-volume 192.168.0.151:/test-volume 192.168.0.152:/test-volume You would then mount it as say \mnt\gfs_test What happens when I want to add 2 more servers to the storage pool and then also use them in this volume? Is there any easy way to expand the volume AND increase that replica count to 5? My end goal is to run this on EC2 instances, say 3 Apache front ends, with the webroot setup on the gluster volume mount. My concern is that if I ever need to spin up a server, I would want the server to not only be an additional Apache front end, but also another server in the gluster file system, adding to fault tolerance as well as possibly giving a slight boost in read speed. Maybe there are better options that would fit the bill here? Thanks.

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• Virtualize SBS 2003 - P2V vs migrating to new VM

  - by jlehtinen

  I need to virtualize a SBS 2003 server in my work environment. I need some tips on what people think is the best way to proceed. Background: The SBS 2003 server is the primary DC for the domain and also hosts FTP, RRAS(VPN), DNS, and file shares. Exchange is NOT used, neither is SQL server. DHCP is done via a firewall appliance. I have added a Server 2003 VM to the domain and promoted it to the DC role. AD/DNS is replicating here correctly. This was mainly done to provide fault-tolerance to the domain, I was not intending to make this VM the primary DC. I've already asked about buying upgraded licensing for Server 2008/2012 but was refused due to cost. Options: I see (at least) two routes I could take to complete this. From what I've read option 2 is the "preferred" method, but there's a few steps where I'm not clear on what to expect. Option 1.) P2V the primary DC Power off primary DC Power off secondary DC (to prevent USN rollback in case P2V has issue) P2V (cold clone) primary DC Boot new PDC VM Allow new hardware to detect Remove old NIC hardware from device manager Assign old IPs to new virtual NICs Reboot PDC VM, confirm connectivity and no major issues Power on secondary DC, confirm replication Option 2.) Create new VM, transfer roles, remove original DC from domain Create new VM, install SBS 2003 Do I need the original SBS install discs for this? MS migration doc mentions this. Add VM to domain, promote to DC role Does this start 7 day timer where two SBS servers can be in same domain? Set up RRAS on new VM Set up IIS/FTP on new VM Move file shares to new VM Transfer FSMO roles to new VM DC dcpromo original primary DC out of domain

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• Distributed storage and computing

  - by Tim van Elteren

  Dear Serverfault community, After researching a number of distributed file systems for deployment in a production environment with the main purpose of performing both batch and real-time distributed computing I've identified the following list as potential candidates, mainly on maturity, license and support: Ceph Lustre GlusterFS HDFS FhGFS MooseFS XtreemFS The key properties that our system should exhibit: an open source, liberally licensed, yet production ready, e.g. a mature, reliable, community and commercially supported solution; ability to run on commodity hardware, preferably be designed for it; provide high availability of the data with the most focus on reads; high scalability, so operation over multiple data centres, possibly on a global scale; removal of single points of failure with the use of replication and distribution of (meta-)data, e.g. provide fault-tolerance. The sensitivity points that were identified, and resulted in the following questions, are: transparency to the processing layer / application with respect to data locality, e.g. know where data is physically located on a server level, mainly for resource allocation and fast processing, high performance, how can this be accomplished? Do you from experience know what solutions provide this transparency and to what extent? posix compliance, or conformance, is mentioned on the wiki pages of most of the above listed solutions. The question here mainly is, how relevant is support for the posix standard? Hadoop for example isn't posix compliant by design, what are the pro's and con's? what about the difference between synchronous and asynchronous opeartion of a distributed file system. Though a synchronous distributed file system has the preference because of reliability it also imposes certain limitations with respect to scalability. What would be, from your expertise, the way to go on this? I'm looking forward to your replies. Thanks in advance! :) With kind regards, Tim van Elteren

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• How does KMS (Windows Server 2008 R2) differentiate clients?

  - by Joe Taylor

  I have recently installed a KMS Server in our domain and deployed 75 new Windows 7 machines using an image I made using Acronis True Image. There are 2 variations of this image rolled out currently. When I go to activate the machines it returns that the KMS count is not sufficient. On the server with a slmgr /dlv it shows: Key Management Service is enabled on this machine. Current count: 2 Listening on Port: 1688 DNS publishing enabled KMS Priority: Normal KMS cumulative requests received from clients: 366 Failed requests received: 2 Requests with License status unlicensed: 0 Requests with License status licensed: 0 Requests with License status Initial Grace period: 1 Requests with License statusLicense expired or hardware out of tolerance: 0 Requests with License status Non genuine grace period: 0 Requests with License status Notification: 363 Is it to do with the fact that I've used the same image for all the PC's? If so how do I get round this. Would changing the SID help? OK knowing I've been thick whats the best way to rectify the situation. Can I sysprep the machines to OOBE on each individual machine? Or would NewSID work?

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• what is best multi-server configuration with OpenVPN

  - by sebut

  We have a number of Database severs running MongoDB on Debian plus a number of Application servers also on Debian. The db servers hold replicating db clusters, so they need to talk to each other. Application servers need to talk to all db servers (for reasons of fault tolerance). The servers are potentially spread across multiple hosting centers, so we need secure channels between all servers. The number of servers is bound to grow, so we need a VPN solution that's easy to maintain and expand. This is why I feel that SSH that we use for testing might not be up to the task and OpenVPN seems the way to go. I have ruled out TAP, since I understand that this would mean all traffic going to all the servers - perhaps this is a misunderstanding and TAP acts more like a switch? With TUN devices I imagine that all DB servers would live in their own separate subnet, they would also need a client configured to be able to connect to each of their peers. The application servers could live in a common subnet range with a client config only. Does this sound like a reasonable setup? Strangely, on the web I did not find anything about multi-server with OpenVPN. Thanks for all insights and ideas!

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• .NET Framework 4 updates breaking MMC.exe and other CLR.dll Exceptions

  - by Fox

  I've seen this issue floating around the net the last few weeks and I'm facing exactly the same issue. My servers are set to auto install updates using Windows update (not clever, I know), and since about 2 months ago, I've been getting strange Exceptions. The first thing that happens is that MMC.exe just crashes randomly and sometimes on startup of the console. The exception in the Windows Application log is as follow: Faulting application name: mmc.exe, version: 6.1.7600.16385, time stamp: 0x4a5bc808 Faulting module name: mscorwks.dll, version: 2.0.50727.5448, time stamp: 0x4e153960 Secondly, on the same server, I have some custom Windows services which constantly crash with exceptions : Faulting application name: Myservice.exe, version: 1.0.0.0, time stamp: 0x4f44cb11 Faulting module name: clr.dll, version: 4.0.30319.239, time stamp: 0x4e181a6d Exception code: 0xc0000005 Fault offset: 0x000378aa The exception is not in my code. I've tested and retested it. My server has the following .NET Framework updates installed: Does anyone have any idea?

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• HP network discovery service flooding network with SLP / SRVLOC requests

  - by Chipmunk

  I am having trouble with "HP Network discovery service" which I think is responsible for flooding my network with SLP/SRVLOC requests. This has happened on multiple occasions on different devices where some HP printer software installed. Have I misconfigured something in my network that causes this? Or is the HP service at fault? The destination address (224.0.1.60) and SLP confirm that it is a HP service that is doing this. Also the service url in the packets read: "service:x-hpnp-discover:" further confirms this. Why is this happening? I doubt HP would release faulty software like this? So this leaves me thinking that maybe some settings on the HP Procurves are not set up properly? Comments and suggestions welcome, thank you. Kind regards, Chris

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• Rewrite rules doesn’t work apache 1.3

  - by Sander Versluys

  I'm using a couple of rewrite directives that always works before on apache2 but now i'm trying new a shared hosting and the rewrite rules do not seem to get applied. I've reduced the .htaccess files to the following essential rules: RewriteEngine On Rewritebase /demo/ RewriteRule ^(.*)$ index.php/$1 [L] As you can see, i want to rewrite every request to my index.php file in the demo folder from root. So everything like http://www.example.com/demo/albums/show/1 should be processed by http://www.example.com/demo/index.php for a standard MVC setup. (I'm using CodeIgniter btw) The directives above results in a 500 error, so i thought maybe because of some possible syntax differences between 1.3 and 2.x. After some trail and error editing, i've found the rewrite rule itself to be at fault but i really don't understand why. Any ideas to why my rewrite rule doesn't work? it did before on lots of different servers. Suggestions how to fix it? Note: mod_rewrite does work, i've written a small test to be sure

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• Sonicwall SSL VPN Login : I need help with a NetExtender initialization error.

  - by jacke672

  I receive the error message: "Server is busy now, please try it later!" after logging into our Sonicwall successfully and attempting to initialize NetExtender for the "virtual office" function. It was set up yesterday and I am able to log in without any issues, but I keep getting hung up on the installation and/or initialization of NetExtender. I have attempted to connect remotely on XP and 7 using both FireFox and IE. I am using a Sonicwall NSA-240 with load balancing active (1 ISP and 2 different connections)- I have tried turning off load balancing and disabling the secondary connection but still receive the same error. I've been in contact with SonicWall support but I haven't heard from them as of yet so I'm asking the Server Fault community in the meantime... Does anyone have any ideas as per what could be the issue? Thanks -Jack

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• DHCP Relay V DHCP Local Cisco v 3com

  - by DefSol

  Howdy, I have a client who has a WAN with 7 sites. At one site in particular, randomly about 4-5 clients do not get an IP address. The local gateway is a cisco 871 and relay's to a windows server in a Data Center running a valid scope for the subnet. If I put in a cisco 1800 and configure a dhcp scope (disabling the scope on the server) all clients get an ip address and everything is right with the world. The Wan providing keeps saying it's a local issue although we can work around with the 1800. The provider says a 3Com switch is at fault and the 1800 does not have a local switch, and because the 871 does, means the internal switching will receive a different uplink policy. The 3Com is the only managed switch in the subnet. Any ideas greatly appreciated. Reuben

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• DHCP Relay V DHCP Local Cisoc v 3com

  - by DefSol

  Howdy, I have a client who has a WAN with 7 sites. At one site in particular, randomly about 4-5 clients do not get an IP address. The local gateway is a cisco 871 and relay's to a windows server in a Data Center running a valid scope for the subnet. If I put in a cisco 1800 and configure a dhcp scope (disabling the scope on the server) all clients get an ip address and everything is right with the world. The Wan providing keeps saying it's a local issue although we can work around with the 1800. The provider says a 3Com switch is at fault and the 1800 does not have a local switch, and because the 871 does, means the internal switching will receive a different uplink policy. The 3Com is the only managed switch in the subnet. Any ideas greatly appreciated. Reuben

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• Proliant ML350 Won't Load Windows

  - by Mike

  I have a HP Proliant ML350 G4 running Windows 2003 Server Std Edition that will not load Windows on boot. It gave me a BSOD while running a recent Windows update and has not been able to boot since. The BSOD was a generic error, "Hardware Fault. Contact vendor." I am not getting any errors when the machine boots--it just hangs with a black screen when Windows starts to load. The machine will not boot into safe mode either--it gets stuck after beginning to load drivers. When trying to load the Windows recovery console I get the message that Windows cannot find any hard disks on the machine. This, despite having to load the driver for my storage controller. The HP Smart Start diagnostics finds no problems with my hard disks nor anything else. What should I try next? Mainly, I just want to be able to pull the data off my hard disks.

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• LSI 9211-8i won't boot in KVM

  - by Paul McMillan

  I'm running ubuntu 11.04 with an LSI 9211-8i in IT mode with the latest firmware (10). I'm using KVM with VT-d enabled to pass the entire PCIe device through to the guest OS. I have the device disabled in the system BIOS. When I boot my virtual machine, the adapter quits during bios initialization with the following error: Unable to load LSI Corporation MPT BIOS MPT BIOS Fault 0Ch encountered at adapter PCI(00h,04h,00h) Press any key to continue... I know the virtualization is correctly enabled. I've blacklisted the kernel modules in the host OS. Has anyone else encountered this error? I'm about out of ideas here. Edit: I contacted LSI tech support about this, and they suggested that I try RedHat and Xen. Apparently they don't test or support anything else.

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• How do I generate a core dump from apache

  - by blockhead

  I have a script which intermittently returns a white screen of death in firefox and Error 324 (net::ERR_EMPTY_RESPONSE): Unknown error. chrome. When I try to access the script using a PHP HTTP client (like Zend_Http_Client), intermittently I get an exception (sorry I don't have the exact message on me at the moment). I suspect a segfault. This is further buttressed by the lines in my error log that look like this: [Thu Mar 18 16:03:02 2010] [notice] child pid 845 exit signal Segmentation fault (11) Now, I'm running RedHat, and I know that RedHat doesn't generate core dumps out-of-the-box. I followed the instructions here http://kbase.redhat.com/faq/docs/DOC-5353, but I'm not seeing any core dumps. How do I generate a core dump?

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• SMTP Relay through exchange

  - by John

  Hi guys, We have a bit of a problem in that we want our printers to email our contractor whenever they develop a fault. The problem is on our corporate network we have no access through the firewall to the internet preventing us to use the external SMTP server. So i suppose the question is can we use our exchange server to do this? IE could I run an SMTP service that would forward to the exchange server which would then send the mail to the contractor? Any ideas welcome! Thanks John

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• SharePoint 2010 Search Error 0x800703fa

  - by Ben

  We have migrated from SharePoint 2007 to 2010. Everything appears to be working correctly except for an intermitent error with search. Occastionally search results will crash for all of our sites and when we look up the coorliation id we get the following error: Exception when fetching results: System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: Illegal operation attempted on a registry key that has been marked for deletion. (Exception from HRESULT: 0x800703FA) (Fault Detail is equal to An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is: System.Runtime.InteropServices.COMException: Illegal operation attempted on a registry key that has been marked for deletion. (Exception from HRESULT: 0x800703FA) at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo) at Microsoft.Office.Server.Search.Query.KeywordQueryInternal.Execute() at Microsoft.Office.Server.Search.Query.QueryInternal.Execute(QueryProperties properties) at Microsoft.Office.Server.Search.Administration.SearchServiceApplication.Execute(QueryProperties properties) at SyncInvokeExecute(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc) We reset IIS and the problem resolves itself for a while. Has anyone come across a perminant fix for this?

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• Why would cat6 connectors not work with cat5e patch cable?

  - by Lee Tickett

  I had a naff batch of cat5 connectors (the latching mechanism didn't work) so decided to order in some cat6 connectors in preparation for the inevitable upgrade. My existing reel of for making patch cables is cat5e utp stranded. I made up a few cables and tested them- none of them worked. I recrimped and still nothing. When i check them with a multi-meter not all pins are connected. This reel has always worked with the previous cat5 connectors so I tested the cat6 connectors on a reel of solid cat5e cable and they work fine. Any ideas what I might be doing wrong? Or what might be at fault? (cable/connectors) and how I can diagnose? Thanks Lee

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• Windows Home Server style redundancy/multi-disk-support on Windows Server 2008 R2?

  - by user19597

  I'm setting up a fileserver for our department. It'll be connected to the domain. I want it to have a very large amount of storage (several TB). Ideally, it should also preserve disk space by identifying identical files and only storing them once. It should be fault tollerant so that if one of the drives fails, that drive can be replaced without losing any data. All of these features are available in Microsoft's consumer offering - Windows Home Server. However, I can't find these kind of features within the enterprise Windows Server 2008 R2. Am I missing something? I know that I could buy a Drobo, or similar, and use this instead. However, I would prefer to use a built-in feature of Windows Server should it exist. It seems surprising to me that these features should be available in Home Server but not in an enterprise fileserver.

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• Why would the 'show processlist' command speed up normally slow requests to my remote DB? (connected via VPN)

  - by Hakan B.

  I am running a local Django development server that connects to a remote MySQL server via a VPN (IPSec). Request times are awfully slow and I consistently see timeouts. Attempting to diagnose the problem, I logged in to the remote database and ran: show full processlist Immediately, the local server went from idle to working. The page had not yet completely loaded, but progress had been made (debug logs confirm this). When I ran 'show full processlist' several times more in succession, the request completed quickly. I can currently reproduce this - unless I run 'show full processlist' over and over on the remote server, my local request usually times out. Does anyone have any idea why this would happen? I'm running Django 1.3 and OS X 10.7. Note: I realize this may be entirely not be a question with a clear-cut answer and is probably my fault, but it is odd and reproducable, so I hope someone can at least point me the right direction. Thanks in advance.

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• PHP5 module makes Apache 1.3 segfault

  - by tehalive

  I am trying to get PHP4 and 5 to work with Apache 1.3. PHP4 is compiled as a module and currently works fine, although Apache does display the following warning upon starting: Loaded DSO libphp4.so uses plain Apache 1.3 API, this module might crash under EAPI! (please recompile it with -DEAPI) So I compiled PHP5 using the latest source. I get the same warning, twice now for each PHP module, but then Apache gets a segmentation fault when loading the PHP4 + PHP5 modules. I have tried compiling PHP5 with apxs and without. It does appear to be using the -DEAPI flag. Maybe this isn't related to the segfault. The flags I am using to configure PHP5: ./configure --with-mysql --with-zlib --disable-cgi --with-apxs=/www/bin/apxs

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• Tool to copy IMAP folders from one server to another

  - by Barry Brown

  I need a Unix-based tool, such as a shell script or command-line program, to copy IMAP folders from one server to another. Ideally, the tool should copy all the folders for a single account (Inbox, Sent, Trash, and user-created folders) at once, rather than one folder at a time. It should preserve message dates. As an option, I'd like to be able to copy just a single IMAP folder. Alternatively, is there a tool to copy an mbox file to an IMAP server? I have direct access to the mbox files in the filesystem, but not to the filesystem of the remote IMAP server. Edit: Is there a way for a user to migrate their own questions to Server Fault?

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• How to separate Hyper-V Private network from the External network

  - by Ron Ratzlaff

  I am setting up a virtual test lab and I configured a domain controller VM running Windows 2008 R2 on my Hyper-V 2008 R2 server. I needed to download and install updates on it so I added an External NIC adapter and got that done. However, systems on my actual real physical domain were pulling IPs from this server and that was a big oopsy on my part so I immediately removed the External NIC adapter until I could find out how to go about keeping the Private and the External separate. If someone from the Server Fault community can help with this since I am pretty new to this, I would be very grateful. Thanks everyone.

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• Binding MySQL to run from the public or private LAN IP address - which one is faster

  - by Lamin Barrow

  So we have 2 servers all running at the same web host. We have bind MySQL to listen on the public ip-address of the database server and the web server connects to it from the public ip. Both servers run on the same private network. Currently, the DB connect method from our php script takes about 3ms to connect to the MySQL database server host. My question is, would MySql data interaction from the web server be faster if we bind it to listen on the private lan address on the database server instead of the public IP? or is it the same regardless and it wont make a different. i have moved this question to server fault http://serverfault.com/questions/438156/binding-mysql-to-run-from-the-public-or-private-lan-ip-address-which-one-is-fa

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