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• How can I tell if my live web-server is overloaded?

  - by Nick G

  We have a live webserver which doesn't seem to be performing all that well. It's a Dell PowerEdge machine, a few years old (dual core, 4GB) which is hosting about 20 low-traffic websites. However it doesn't seem to be as fast as it used to be. How can we determine the cause of this? If it's website traffic, I would be expecting high CPU but CPU usage is quite low and hovers around the 15-30% mark except for very brief periods. I'm wondering perhaps, if rather than CPU performance being a problem, perhaps it's disk thrashing due to the constant read/writes of all the small web files and database queries. It has 4x 7200 RPM SATA drives in RAID 5. So is there a way to check that it's not disk thrashing?

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• Is there any chance that my data will get silently corrupted with a robocopy SMB network transfer?

  - by Archagon

  I'm setting up a NAS box for the first time. At the moment, I have most of my data backed up to a few local hard drives, and I intend to transfer all the data to my NAS over ethernet once the RAID array is setup. Since this is all happening over the network, I'm a bit worried about my data getting corrupted silently during transfer. From what I understand, data generally doesn't get corrupted without notice on local transfers because a checksum is performed at some point by the drive or the OS. (This could be totally wrong.) Does the same thing happen with SMB, or is it up to the transferrer to check the integrity of their data? And if it doesn't happen with SMB, is there a protocol that does ensure data integrity? I know that rsync can checksum a transfer, but I'm on Windows and I already have a robocopy configuration that I like. Will my data be safe or do I have to use an external checksum tool to make sure?

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• How does a winkydink Teradici offer high res, full FPS, 3D rendering on ESXi 5 VDIs for AutoCAD/SolidWorks/1080p YouTube applications?

  - by BlueToast

  How does such a small Teradici card ![enter image description here][1] offer high resolution, full FPS 3D graphics (1:38) http://www.youtube.com/watch?v=eXA4QMmfY5Y&feature=player_detailpage#t=97s for ESXi 5.0/5.1 VDI environments? We're shooting for an AutoCAD/SolidWorks/YouTube 1080p capable environment. I can't see how such a small and low profile card could possibly have the horsepower to handle such GPU computations for a big environment like that. We're going to have up to 64 VDIs per server, and are a 500-1000 employee count sized company. Someone enlighten me please! Determining which route to go (between RemoteFX and VMware View/PCoIP) and the hardware (NVIDIA 4GB non-Quadro/Tesla GPUs vs Teradici card). Servers have three 4x, three 8x, and one 16x PCI-E lane. Two of the 8x lanes will be occupied by SAS RAID cards.

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• How could all of my hard drives fail at once?

  - by Taylor

  I have an Ubuntu 13.04 server. Today I found the box had crashed. I restarted it, and now every single hard drive's partition table is missing. (1 SSD for /boot, /, and 3 2TB drives for RAID). I have the SSD connected to a laptop VIA USB-SATA cable, and sure enough, the partition table is missing. This tells me that the Motherboard / SATA controller / software actually broke the drives, not that they just can't be read correctly. Something similar happened to only the SSD a few months ago, and I was forced to just re-partition it. How the heck could his have happened? Bad Motherboard or SATA controller?

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• Running out of space on a SAS-based workstation

  - by SteveWilkinson

  Hi - first question on serverfault - pls excuse if asked elsewhere. I have a Dell Precision 690 with one 73GB (15000RPM) SAS drive in it. Running Windows 7 (x64) with a bunch of apps means it is running out of space. I have on order a 147GB (15000RPM) SAS drive (same GB/s, same make) which I want to put into the machine. Not knowing anything about SAS, do I need to replace the 73GB with the 147GB and restore from a backup, or can I put the drive in the machine and get the controller to treat the two drives as one large one? (The original paperwork for the machine says 73GB SAS (No RAID) if that is relevant.) Thanks in advance.

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• Running out of space on a SAS-based workstation

  - by SteveWilkinson

  Hi - first question on serverfault - pls excuse if asked elsewhere. I have a Dell Precision 690 with one 73GB (15000RPM) SAS drive in it. Running Windows 7 (x64) with a bunch of apps means it is running out of space. I have on order a 147GB (15000RPM) SAS drive (same GB/s, same make) which I want to put into the machine. Not knowing anything about SAS, do I need to replace the 73GB with the 147GB and restore from a backup, or can I put the drive in the machine and get the controller to treat the two drives as one large one? (The original paperwork for the machine says 73GB SAS (No RAID) if that is relevant.) Thanks in advance.

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• Any recommendations on a NAS for a home-super-user?

  - by marc_s

  Can anyone recommend a good NAS for use in a home-server environment? I would request at least 2, preferably 4 disks, and I am most interested in good to excellent throughput for file-server and backup purposes - don't need any of the fancy media-streaming or -sharing features, that's not of interest to me. For a 4 or more disk solution, support for the various RAID levels (0, 1, 1+0, 5) would be a plus - especially if supported in hardware (rather than just a software emulation). I just need a place to put my collection of data, ISO images, and so forth - and since several external disks (self-built and off-the-shelf) have failed so far, I'm looking into a more reliable solution. Marc

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• ESXI with non standard hardware HDD issues

  - by Hurricanepkt

  I have 3 very underutilized servers that I am condensing to one of those shuttle PC's with VMWare ESXi The HDD seems to be the bottle neck right now (the light is almost always pure solid) right now I have a single 1TB Seagate 7200.11 connected by SATA. VMWare ESXi cannot detect it when running in AHCI mode, but does when running in IDE mode. I have read that IDE mode can give a 5% performance hit which might give me enough breathing room. However, I am open to setting up an external eSATA or some sort of raid to give me more than just the 5%. I am just weary of sinking some money into a bit of hardware without knowledge of whether it will work. Does anyone know of resources or procedures of how to get this working.

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• Can SysPrep (or anything else) be used to make a Win XP partition from another computer bootable?

  - by chris5gd

  I've used Paragon Backup and Recovery Free as recommended to me in my other question, to backup my C: (Win XP) and D: (installed apps) partitions. Before taking the rather scary step of breaking the RAID 0 array on which it's currently installed, and restoring to one of the individual drives, I'd quite like to test the restorability of the imaged partitions. I've restored them on to a spare disk in another computer, which of course won't boot from them in their current state. Is it possible to use SysPrep (or another tool) on the restored partitions, to make it bootable?

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• Workstation Build: Single 2.66ghz i-7 with overclock potential, OR Dual 5520 2.26ghz Xeons?

  - by jdc0589

  There are probably better places to ask this, but I am used to the excellent quality of responses on stack overflow. I am rebuilding my desktop in a few months. Aside from normal lightweight internet usage, I use it to run sqlServer, mySql, 1-2 Ubuntu VMs from time to time, lots of IDE's, and a media server for my PS3. The two possible setups cost the exact same amount (within $50) and would both have 12gb 1333mhz ddr3 ram and a 500gb RAID-0 array (250x2). Now, If I go with a single i-7 920 2.66ghz quadcore, I can easily overclock it to 3ghz, and would have cash leftover to get a 160gb ssd (either the ocz vertex or the 120gb intel) for the main OS/Program install drive. Else, I could get a dual lga1366 motherboard with two e5520 Xeon's (2.26ghz),just use the disks I already have. So, do I go for 8 physical/16 virtual cores at 2.26ghz (No overclocking on server boards) with normal disk I/O, or a 4 physical/8 virtual cores at 3.0ghz with really outstanding disk I/O?

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• How do I set up two existing disks with identical contents as a single mirrored volume in Windows 7 without losing data?

  - by Software Monkey

  I have two data disks that were, heretofore, in a mobo RAID configuration in Windows 7. They are now separate AHCI disks, visible in Computer Management. How to I go about making them a single mirrored volume in Windows? Note: The data is backed up up on two other separate disks, but it's a fair amount of work to do a restore (over 120'000 files, and I have to reset permissions). Note2: Currently the two disks are identical, and I can use the content of either one for this.

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• One huge drive (network share) from many computers, with folder priority redundancy.

  - by Exception Duck

  Not sure if this exists, but I have a huge amount of data to store (about 5-50mb files) and as it is now, I have 5 computers, each with raid 5 providing about 6TB hard drive each. This is causing some problems with the software I am using (something home made) so I'm wondering, is there some software that I can install on all those computers that will mask it as one huge drive... Running windows on those computers, from Xp 64 bit to windows server 2008 I would also like to set a priority on each folder on the redundancy it has, some folders I can live without no online backup (I have a backup in a safe of that data) but some I need full online backup system if one hard drive fails. Something open source, as I try to use that as much as I can, but all ideas welcome.

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• Distributed filesystem for automated offline data mirroring

  - by Petr Pudlák

  I'd like to achieve the following setup: Every time I connect my laptop to a local network, my partition gets automatically mirrored to a partition on my local server. I only want to mirror what has changed from the last time. (I understand that it is not a proper backup solution since there is no history of the changes, it'd be more like a non-persistent network RAID.) Is there a distributed file system that allows such a setup? I've done some searching and it seems to me that most distributed file-systems are focused on data availability and distribution, not duplicating them. I'd be thankful for suggestions. Edit: Sorry, I forgot to mention: I'm using Linux.

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• RAID10 Without BBU, With UPS

  - by Richard

  My datacenter says that each rack has primary and backup power on each rack. I assume this means there is a UPS for each server. Therefore, do I have any need of getting a BBU for the following setup? Intel Cherry 520 SSD x 4 RAID 10 LSI-9260 with WRITEBACK CACHE ENABLED I have heard that without a BBU the data in the cache could be lost. Since my needs aren't mission-critical, I can afford to lose some data. But would the rest of the data on the HD be corrupted?

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• What are USB device resets?

  - by ILIV

  I have this brand-new software RAID-1 built with two WD Elements external USB drives, and I can see that Linux repeats the following message quite a bit: ... [302148.036912] usb 1-3.1: reset high-speed USB device number 19 using ehci_hcd [302153.052029] usb 1-3.3: reset high-speed USB device number 20 using ehci_hcd [302186.031481] usb 1-3.3: reset high-speed USB device number 20 using ehci_hcd [302217.050210] usb 1-3.3: reset high-speed USB device number 20 using ehci_hcd [302281.043543] usb 1-3.3: reset high-speed USB device number 20 using ehci_hcd [302312.090158] usb 1-3.3: reset high-speed USB device number 20 using ehci_hcd [302351.076851] usb 1-3.1: reset high-speed USB device number 19 using ehci_hcd ... So, what does it say? Is this normal? Is this a problem that I should try to fix?

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• Offer me an ASP.NET & a SQL Server 2008 server specifications for about 2000 concurrent users, please.

  - by amkh

  We have a web application project wich will be created using ASP.NET 4.0, Entity Framework, and SQL Sever 2008 R2. To meet the needs, suppose a normal page of this application that has a query which it takes 10 miliseconds to response on a Core2 Quad @ 2.8GHz proccessor with 2x2GB of DDR3 Ram (EntityFramework overheads are considered). And we will have about 2000 concurrent user at peek times. So, what is the best recommended specifications (CPU/RAM/RAID/...) for the server which will be host this application? -- Or -- How can I calculate that?

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• Best way to backup Active Directory with a single domain controller

  - by John Hall

  I have a domain with about 15 users and a single Windows Server 2008 domain controller. Some recent issues with my RAID controller have made me reconsider how I go about securing the AD data. Currently I run a System State Backup nightly. However, it seems that it is impossible (or at least difficult and unsupported) to restore that to any other machine than the one from which it was taken. Adding a second DC to the domain seems expensive and overkill for such a small network. Is there no other way to backup the AD data?

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• I know this is a stupid question but... How many websites can my server potentially hold?

  - by Daniel Kindler

  Sorry for the "noob" question, but... About how many medium-sized websites with average traffic could this server hold? Just like the average website, kind of like a small business site. How many sites could this server hold, but still maintain nice, decent speed? PowerEdge R510 PE R510 Chassis for Up to Four 3.5" Cabled Hard Drives, LED edit Processor Intel® Xeon® E5630 2.53Ghz, 12M Cache,Turbo, HT, 1066MHz Max Mem edit Memory 8GB Memory (4x2GB), 1333MHz Single Ranked UDIMMs for 1 Procs, Optimized edit Operating System SUSE Linux Enterprise Server 10, SP3, Up To 32 CPU Lic, 1 YR Sub, DIB, Media edit Red Hat Enterprise Linux Licensing Hard Drives 250GB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 1TB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 2 X 2TB 7.2K RPM SATA 3.5in Cabled Hard Drive Hard Drive Configuration No RAID, Embedded SATA Controller for x4 Chassis edit Power Supply 480 Watt Non-Redundant Power Supply edit Thank you!

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• Recommendations for SSD for server and database use?

  - by Tony_Henrich

  SSDs are a new technology and they are constantly improving. A lot of the posts here were posted in 2009 when SSDs where less mature and not as fast. What was recommend back then is probably out of date today because of better options. The SSD is used to hold SQL Server databases. Size is probably 128G. The database is used with a CMS and web server so web pages need to get their data and render as fast as possible. Which modern SSD is recommended for such a use? Is there an SSD better than Intel X-25 E/M in terms of performance/cost? (I am also evaluating cost between : RAM + UPS (semi persistent) vs SSD for same amount of gigabytes. No RAID is involved)

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• Occasional HDD Related Hangs

  - by diolemo

  I have an issue that seems to be disk related. Occasionally my system will block for 30 or so seconds and is mostly unresponsive. Those things already in memory requiring no disk access continue to function but those things requiring disk access (even small) hang. 30 seconds later everything is back to normal. I have 2 Samsung drives in RAID 0. I have 1 WD drive (has pagefile) I have an SSD used for caching (Intel Smart Response). This is a new install of Windows and the drives were fine in my old PC (~1 month ago). Has anyone experienced anything similar? Any suggestions to solve this one? Thanks in advance.

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• ESXI 4.0 Slow response in opening anything accross the network on a Virtual Server running Win2008

  - by user40944

  Hi I recently installed a HP ML350G6 Server with Windows Small Business Server 200864bit, Exchange 2007. The server was running fantastically and we transferred all user data onto the new server and no problems for 2 weeks! We then installed SQL2008 and transferred the accounts package onto the server and this is where the problems started. Users are now complaining to open a work document can take 2 minutes and the same with regard to anything else. The server itself seems fine, the virtual server seems fine! No disk performance problems (doesn't go above 50% unless i really copy lots of things), no memory, (12Gb only using 7Gb) cpu (usage is low average about 15%) etc on both the VM and in Windows Task manager. I have made sure disk caching is enabled on the raid controller (which made no difference). Network cards are running 1Gb and plugged into HP GB switch. Please help!

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• How many websites can my server potentially hold?

  - by Daniel Kindler

  Sorry for the "noob" question, but... About how many medium-sized websites with average traffic could this server hold? Just like the average website, kind of like a small business site. How many sites could this server hold, but still maintain nice, decent speed? PowerEdge R510 PE R510 Chassis for Up to Four 3.5" Cabled Hard Drives, LED edit Processor Intel® Xeon® E5630 2.53Ghz, 12M Cache,Turbo, HT, 1066MHz Max Mem edit Memory 8GB Memory (4x2GB), 1333MHz Single Ranked UDIMMs for 1 Procs, Optimized edit Operating System SUSE Linux Enterprise Server 10, SP3, Up To 32 CPU Lic, 1 YR Sub, DIB, Media edit Red Hat Enterprise Linux Licensing Hard Drives 250GB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 1TB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 2 X 2TB 7.2K RPM SATA 3.5in Cabled Hard Drive Hard Drive Configuration No RAID, Embedded SATA Controller for x4 Chassis edit Power Supply 480 Watt Non-Redundant Power Supply edit Thank you!

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• How to extend a partition in Windows 2000 Server

  - by user999684

  I have a Windows 2000 Server set up with RAID 5. I initially defined 2 136 GB logical disks 0 and 1. I have a small utility partition on disk 0 along with the C drive. I wish to extend the C drive to use disk 1 as well, which is now configured to drive D. I deleted drive D, but it is still in disk 1. I download partdisk.exe from MS, but am not sure how to accomplish what I want to do. I know I need to use extend, but I think I need to remove disk 1 and somehow add the unallocated space to disk zero, but am not at all confident on how to do it.

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• Access MacZFS via network from XBMC

  - by AreusAstarte

  I have a ZFS RAID (zpool with three drives) hooked up to my Mac that I want to share in my LAN so that the XBMC client on my OUYA console hooked up to the television can read the drive and use it to stream my movies and television shows onto the television set. I've searched around for a bit but so far haven't found anything that helped me with it. I know that when connecting to the Mac with SSH I can't just access the drive due to different formatting. What do I have to do so that XBMC will be able to read it? How do I share it?

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• What's a good box to serve files on my local network, cross platform?

  - by rogpeppe

  I've installed CAT5e cable and gigabit switches in my house with the goal of having an "always-on" file server in the loft, accessible to both my macbook and my partner's Windows box. I'd like to find a solution which: uses minimal power. allows me to access as much disk bandwidth as possible. provides glitch-free file access to both MacOS and Windows. is as cheap as possible, while remaining reliable. Optional, but desirable extras: software or hardware RAID; open source solutions. A SheevaPlug with eSATA seems one possibility, but I'm sure there are any number of other good options.

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