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• RAID 10: SPAN 2 vs SPAN 4

  - by LaDante Riley

  I am currently configuring RAID 10 (first time doing RAID ever) for a server at work. In the Configuration Utility. I am given the option of either span 2 or span 4. Having never done this before, I was curious if someone could tell me the pros and cons of for each span? Thanks The server is a Poweredge r620 with a PERC H710 mini (Security Capable) RAID controller. I have 8 600GB hard drives. I am creating this server as a network storage drive. I have SQL server historian database whose 1TB storage filled up and after 5 years of logging data.

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• Should I disable write caching on my Windows 2008 VM?

  - by javano

  I have a Windows Server 2008 x64 Standard virtual machine that runs on a machine with a hardware RAID controller, a Perc 6/i, which has a battery on-board. Doing everything I can for additional performance, I think I should disable this. Is this very dangerous though? My understand is that Battery Backed Write Caching gives a performance boost to the host OS, telling it the write was complete when they are still sitting in flash waiting to be written. However, I can't see how it would be detrimental to performance, but is there a gain (even if marginal) to enabling it / disabling it? P.s. There machine has a backup power. Here is a screen shot for clarification:

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• NVRAM for journals on Linux?

  - by symcbean

  I've been thinking about ways of speeding up disk I/O, and one of the bottlenecks I keep coming back to is the journal. There's an obvious benefit to using an SSD for the journal - over and above just write caching unless of course I just disable the journal with the write cache (after all devicemapper doesn't seem to support barriers). In order to get the benefits from using a BB write cache on the controller, then I'd need to disable journalling - but then the OS should try to fsck the system after an outage. Of course if the OS knows what's in the batter-backed memory then it could use it as the journal - but that means it must be exposed as a block device and only be under the control of the operating system. However I've not been able to find a suitable low-cost device (no, write-levelling for Flash is not adequate for a journal, at least one which uses Smartmedia). While there's no end of flash devices, disk/array controllers with BB write caches, so far I've not found anything which just gives me non-volatile memory addressable as a block storage device.

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• Ubuntu Wireless card not found

  - by user32121

  Hello all, I'm trying to setup Ubuntu on an old PC. I ran the following command, lspci, in order to get info on the wireless card installed. 00:0a.0 Ethernet controller: Marvell Technology Group Ltd. 88w8335 [Libertas] 802.11b/g Wireless (rev 03) Does anyone know where I can get drivers for this card/chip? And also, how to install (I'm rather new to linux). Also, I'm sure the card is working because I just formatted over xp, and everything was working well. Thanks in advanced!

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• Removing RAID on a DELL power-edge server

  - by Simon Callan

  We have a Dell Power-edge T110 server, with either a PERC S100 or S300 raid controller (I suspect S100), and 2 x 500GB SATA hard discs. These discs are running in RAID-1 configuration, (either 1 or 2 virtual discs), and on top of this, we have the C and D drives. As we are running low on disc space, we are looking at dropping the RAID to get some disc space back. Is it possible to split the discs back into 2 seperate hards discs that the OS can see, without losing all the data on the drives? Even better, would it be possible to split the D: drive, leaving the OS C: drive in RAID1 configuration?

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• LUNS access issue in ESX4 Cluster server

  - by rmustafa

  HI, I've created volumes in equallogic in PS 6000 XV(having 2 member which is in 1 pool), checked & those volumes can be easily detected my ISCSI software in windows. But the problem with ESX , not able to see the assigned disk on ESX server, I can explain what I've done: 1.Created Cluster with enabled HA & DRS 2.Added 3 ESX4 HOST 3.Added VMkernel & configured in all 3 ESX4, enabled vmotion & FT on the same adapter. 4.went to iSCSI storage adapter properties, enabled iSCSI 5.Trying to discover the available storage with the controller IP on dynamic discovery, but not able to see the assigned storage Note: the same volume is accessed to windows that means there is no issue from storage , am I right ???? Note: I wanted to mount the same volume in all 3 ESX host. Please suggest .... Thanks & Regards, Rashid Mustafa

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• S.M.A.R.T - Predictive Failure Count

  - by Bastien974

  I'm monitoring my IBM ServeRAID M5015 controller for RAID status with MegaCLI, I have this on one of the disk : Enclosure Device ID: 252 Slot Number: 6 Enclosure position: 0 Device Id: 14 Sequence Number: 2 Media Error Count: 32 Other Error Count: 0 Predictive Failure Count: 18 Last Predictive Failure Event Seq Number: 8119 PD Type: SAS Raw Size: 279.396 GB [0x22ecb25c Sectors] Non Coerced Size: 278.896 GB [0x22dcb25c Sectors] Coerced Size: 278.464 GB [0x22cee000 Sectors] Firmware state: Online, Spun Up SAS Address(0): 0x5000c50042c319c9 SAS Address(1): 0x0 Connected Port Number: 5(path0) Inquiry Data: IBM-ESXSST9300653SS B6336XN04HC10525B633 IBM FRU/CRU: 81Y9671 FDE Capable: Not Capable FDE Enable: Disable Secured: Unsecured Locked: Unlocked Needs EKM Attention: No Foreign State: None Device Speed: 6.0Gb/s Link Speed: 6.0Gb/s Media Type: Hard Disk Device Drive: Not Certified Drive Temperature :33 Celsius What does this mean exactly ? I can't find an exact description, is there a way to have more details ? The RAID array has the Optimal state. Media Error Count: 32 Predictive Failure Count: 18 Is there a way through the CLI to power-on the front LED so I physically know which disk I need to replace ?

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• Unix domain socket firewall

  - by lagab

  Hello, everyone. I've got a problem with my debian server. Probably there is some vulnerable script at my web-serser, which is running from www-data user. I also have samba with winbind installed, and samba is joined to windows domain. So, probably this vulnerable script allows hacker to bruteforce out domain controller through winbind unix domain socket. Actually I have lots of such lines at netstat -a output: unix 3 [ ] STREAM CONNECTED 509027 /var/run/samba/winbindd_privileged/pipe And our DC logs contain lots of recorded authentication attems from root or guest accounts. How can I restrict my apaches access to winbind? I had an idea to use some kind of firewall for IPC sockets. Is it possible?

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• CA and VPN setup

  - by Raj

  We are a small comany about 20 employees. We have some off site some i houser servers. Where should I install CA? On a domain controller or VM? can I obtain my own certificate for MS VPN? Where should I install MS vpn server? can I install on VM CA server? Do I need to open any ports on Firewall? Please send me or direct me to a web site where I can get setip by step installation instructions. Thanks.

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• APIPA ip address in server 2003 dns for (same as parent folder record) can anyone suggest why this i

  - by dasko

  have a server 2003 domain controller i have installed active directory integrated dns under the forward lookup zone for domain_name.local i see an APIPA ip address that is set for (same as parent folder) with ip number 169.x.x.x looks like (same as parent folder) Host A 169.x.x.x (apipa subnet range) problem is, from other forums that i have read, that this is due to dual nics and one on that is not getting a dynamic or static ip address BUT... I only have one nic in this server? where could this be coming from and could it mess up other settings or not allowing the DC to be contacted? i am just wondering what symptoms could arise due to the record being there. any help would be greatly appreciated thanks.

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• Set up SSL/HTTPS in zend application via .htaccess

  - by davykiash

  I have been battling with .htaccess rules to get my SSL setup working right for the past few days.I get a requested URL not found error whenever I try access any requests that does not do through the index controller. For example this URL would work fine if I enter the it manually https://www.example.com/index.php/auth/register However my application has been built in such a way that the url should be this https://www.example.com/auth/register and that gives the requested URL not found error My other URLs such as https://www.example.com/index/faq https://www.example.com/index/blog https://www.example.com/index/terms work just fine. What rule do I need to write in my htaccess to get the URL https://www.example.com/auth/register working? My htaccess file looks like this RewriteEngine On RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [L] RewriteCond %{REQUEST_FILENAME} -s [OR] RewriteCond %{REQUEST_FILENAME} -l [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^.*$ - [NC,L] RewriteRule ^.*$ index.php [NC,L] I posted an almost similar question in stackoverflow

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• Windows 7 Laptops "unable to find logon server"

  - by tombull89

  In the school I work in we have a large number (500+) of Windows 7 laptops on a Meru Wireless system and Server 2008 R2 Servers. We have an appalingly large failure rate where a student or staff member tries to logon (to the laptop joined to the domain) and is met by "There are currently no logon servers available to service the logon request". I've seen this question and this one and while removing and re-joining to the domain works, it's highly time consuming, irritating, and we (I) have more important things to concentrate on. The only MS KB article I can find is regarding a read-only domain controller (which ours isn't) and I'm at my wits end. Ultimately, is there a definitve cause and answer to this or am I stuck removing and re-joining the laptops?

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• Rename Exchange Server 2003 Domain

  - by Debasish Pramanik

  Hi All: We have the following exchange server deployment Windows 2003 Server + Domain Controller + Exchange Server 2003 The domain name was X.COM. everything was working fine but due to some reason we need to rename the domain name to Y.COM. The rename of Domain went well but the rename of Exchange Server 2003 is having issues. When we run the XDR-Fixup we get the following error Operation failed: Could not get 'configurationNamingContext' on RootDSE of this server. Let me know if you have any idea on this.

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• Dell poweredge 1850's - wont install os

  - by user1326789

  I have 3 of these dell 1850 rack servers. 1 has 3GB RAM and 2 73GB HDD's. 2 have 6GB RAM and each of them has 2 73GB HDD's. I am currently trying to install an os on them but when i boot with windows xp setup, it gives me an error saying no partition found. Now i have set these drives up in RAID on the server and i put them "online" so it should be working fine but they're not. Please assist me in installing an operating system on these, i have no clue as to if it's the BIOS or the RAID controller within it. Thanks in advance, -Matt.

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• Hypertransport sync flood error

  - by Carl B

  What is it? And what causes it? Is it only for uncorrectable DIMM Errors(Troubleshooting DIMM errors)? When an UCE occurs, the memory controller causes an immediate reboot of the system. During reboot, the BIOS checks the Machine Check registers and determines that the previous reboot was due to an UCE, then reports this in POST after the memtest stage: A Hypertransport Sync Flood occurred on last boot 3 BIOS reports this event in the service processor’s system event log (SEL) as shown in the sample IPMItool output There are what seems to be some suggested answers to include Bad Caps Bios verisons (happens in one version not the other) Graphics card issues Lack of power to the CPU The list of possible generators seems to target everything but the computer case. System Specs: Windows Home Premium 64 Motherboard - MSI790FX-GD70 (MS7577) / Bios v 1.9 (American Megatrensa Inc) Ram - Patriot G Series ‘Sector 5’ Edition 4GB DDR3 1600 CPU - AMD Phenom II X2 555 Black Edition Callisto 3.2GHz Socket AM3 80W (Note: unlocked 2 cores CPU Z ids it as phenom II x4 B55) Graphics - 2 x Radeon 5750 in crossfire PSU - ABS 900w HDDs - 2 Seagate 1.5 TB Sata SSD - 1 OCZ 120 GB Vertex Plus R2

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• AD, Windows-NT Authentication queries

  - by rockbala

  Need Help on the following questions. When a users login (on a computer in the network) is validated against AD what is/are the authentication method used? When a users login is validated in Windows NT environment (not AD) what is/are the authentication method used? If all user's account is on AD, is it possible to change the authentication mechanism only (or protocols) from AD to NT and vice versa (if possible)? If part/whole of question 3 is valid, where should one look to change these authentication methods ? What is the difference between AD and Windows-NT authentication ? Windows server 2008 Domain controller used. Regards, Balaji

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• Laptop stopped recognizing USB hard drive

  - by vahokif

  Hi, My Packard Bell EasyNote TX86 laptop stopped recognizing my 1 TB Toshiba Store Art hard drive. It worked fine until now, and it still works on other computers. Other USB devices (including storage) work, and I've tried plugging it in every port, to no avail. When I plug it in it spins up, but Windows doesn't react at all (it's not in disk management), Linux doesn't write anything in dmesg and I can't see it in BIOS setup. I didn't use it at all today, apart from plugging it into a freshly-installed Windows 7 machine once (where it worked). What can I do? Which device is to blame here? EDIT: One more thing. I unplugged the drive while the laptop was hibernated. Google says this might be the problem and it might have something to do with resetting the USB Host Controller.

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• IE does not send NTLM domain

  - by Buddy Casino

  I have a problem with NTLM single-sign-on with IE8. We've got multiple domain controllers and users from multiple domains that we try to authenticate to a web application via NTLMv1 passthru. Somehow IE fails to send the user's domain in the NTLM Type 1 message. This has the effect that the webapp can not match users properly to their domain controllers, resulting in failed logon attempts, because a user from domain X tries to authenticate to domain controller Y. This problem does not occur with Firefox, as it always sends the correct domain header. So: how do I get IE to send the domain in the NTLM header?

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• iSCSI RAID1 on two servers, fail scenario

  - by Franz Kafka

  Hallo, a simple question: Image I have two servers, each server has two disks in RAID1. Now I merge the two arrays with iSCSI to one RAID1 disk. Two questions: Can I do the merging of the 4 disks in one go? I can't image how. First I will have to install the os, and then the raid controller is already set up to RAID1. If a whole server fails the other server would continue working without any problems? Does iSCSI notice that the other server is missing and treet this as if the two disks were broken? When the server comes back online the data is resynced, as if I installed new disks into a array? Can I image that this way? Thanks alot.

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• 64 Bit Windows drivers for Inspiron 1720

  - by Rob Allen

  Dell doesn't seem to offer 64 bit drivers specifically for the Inspiron 1720 (laptop). I'm going to be upgrading from Vista 32-bit to Windows 7 64bit and I want to pull down the necessary stuff before hand. Are there any Dell systems that are similar enough to the Inspiron 1720 that I can use for a baseline to make sure I still have Ethernet and WiFi after the reinstall? It doesn't matter if they are for Vista 64 or Windows 7. Identified hardware: Processor: Intel mobile Core 2 Duo T7500 Chipset: Intel Mobile 965 Express Wifi: Intel Pro Wireless Drive Controller: Intel Matrix Graphics: nVidia GeForce 8600M GT Bluetooth: Dell TrueMobile 355 + EDR Ricoh card reader I think anything else, the default Windows drivers will be sufficient. Let me know if you think I missed something thing please.

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• IBM x260m won't boot from PCI SATA card

  - by syrenity

  Hi. We ghosted our old Windows 2003 drive to a new 1TB one, and connected through new PCI SATA card. The x260m server fails to boot with error 1962: "Boot sector not found." When we connect the drive directly to motherboard, it boots fine, so the problem is probably in getting BIOS to boot from the SATA card. Has anyone encountered and solved such issue? EDIT: We tried disabling the on-board Sata controller (Hostraid/SAS?), but there is no such option - only enable, enhanced and compatible. Tried also to chance boot device priority to all possible choices - no luck. Thanks in advance!

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• Wireless card not found on Ubuntu

  - by idealflip

  Hello all, I'm trying to setup Ubuntu on an old PC. I ran the following command, lspci, in order to get info on the wireless card installed. 00:0a.0 Ethernet controller: Marvell Technology Group Ltd. 88w8335 [Libertas] 802.11b/g Wireless (rev 03) Does anyone know where I can get drivers for this card/chip? And also, how to install (I'm rather new to linux). Also, I'm sure the card is working because I just formatted over xp, and everything was working well. Thanks in advanced!

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• b43 module loaded, but no interface showed up

  - by Eduardo Bezerra

  I'm using CentOS 6.3 x86_64 on a hardware with a BCM43224 chip for wi-fi. I installed the b43-fwcutter module and then run modprobe b43, with no error messages. However, no new network interface showed up, and the return of iwconfig is: lo no wireless extensions. eth0 no wireless extensions. lspci -nn | grep 43224 returns: 03:00.0 Network controller [0280]: Broadcom Corporation BCM43224 802.11a/b/g/n [14e4:4353] (rev 01) and uname -a: Linux localhost.localdomain 2.6.32-279.14.1.el6.x86_64 #1 SMP Tue Nov 6 23:43:09 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Any ideas of how to make the wireless device work?

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• Software RAID to hardware RAID, can it be done?

  - by gtaylor85

  Can it be done ... well. (For the record, I did not set this server up.) In my server there are 4 disks. 3 of them are in a software RAID5, and 1 has the OS installed. I want to buy a RAID controller, 4 new HDs and set up a hardware RAID5. If possible, I'd like to just image the current setup, and use it to build my new one. My questions are: Can I image a 3 disk RAID5 to 4 disk RAID5? Are there problems with this? What is considered best practice for your OS. To have it on a separate disk like it currently is, or to install it on the RAID5? Thank you. I can clarify anything. I'm not sure what other info might be pertinent.

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• FreeNas running on ESXi - sometimes gets very slugish.

  - by Luma

  Hello everyone, I have a ESXi server (dual quad core, 8GB of DDR3 ram, 6x 1TB WD Blacks running in RAid 5 on the PErc 6/i controller. I have a 64bit freenas VM running, on this VM I keep about 200Gigs of stuff that my windows machines access. every now and then the throughput of this VM just dies, for example right now it can't even handle streaming a song and when I tried to transfer a folder the speed goes from 10-400KB/s. Might I add at this point that the ESXi box has dual gigabit network cards plugged into a good solid gigabit switch and other linux and windows VM's are just fine I have seen speeds over 90MB/s (frequently) The server still has ram left over (plenty actually) and cpu is very low (500-1000mhz) any ideas what could cause this? thanks. Luc

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