Computer hardware is the collection of physical elements that comprise a computer system.

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20
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4answers
912 views

What to look for in a datacentre ethernet switch

This is a Canonical Question about choosing a network switch for a datacentre When shopping for a networking switch that's going to be going into the top of a datacentre rack, what specific ...
1
vote
1answer
51 views

What difference between HP and Intel network adapter, both using an Intel controller?

For example, the network adapter HP NC360T PCI card uses the Intel 82571EB controller. So, what exactly is the difference between an Intel "fully" branded card, and a HP branded card having an Intel ...
3
votes
2answers
1k views

Is a hardware watchdog already active at my CentOS server?

I rent a dedicated server (with Intel Haswell CPU and custom hardware) at a lowcost hosting service and use it with CentOS 6.4 / 64 bit Linux (with stock kernel: 2.6.32-358.14.1.el6.x86_64). Every ...
5
votes
3answers
593 views

Hardware checks for Dell R820 Servers through Nagios using SNMP

We use Nagios for monitoring. Is there a way to create hardware checks using SNMP MIB for R820 servers running ESXi5.x on them? Right now we are using this python plugin: current python plugin But ...
1
vote
2answers
68 views

HP p400i - 512MB RAID Controller card

Anyone know if the HP p400i raid controller can support multiple arrays? Say if I wanted a raid 0 with 2x146GB drives, and 3x300GB drives in a raid 5, both on the same card? Also, is it possible to ...
0
votes
1answer
200 views

CentOS dedicated server hangs and discovers new hardware every 3 to 10 hours

I have a dedicated server since March 2013 with CentOS release 6.4 (Final) and CPanel 11.38.1 (build 15) with [Apache/2.2.24 (Unix) PHP/5.2.17]. The server has only one website with traffic about 2000 ...
1
vote
1answer
179 views

Can't sync filesystem without reboot

I'm having an issue with a linux server. Once a week the running mysql instance hangs and there is no way to fully stop it. If I kill it, it remains in zombie status and init does not reap its pid. ...
-4
votes
1answer
328 views

Installing windows on multiple computers at the same time [duplicate]

i need to install windows on a 150 computers for a bank, i've never done anything like this before, so if anyone can help me find a fast efficient way to do so, they are IBM computers all with the ...
2
votes
1answer
757 views

HP DL165G7: NMI error

One of "my" DL165 G7 Proliants has rebooted out of the blue for the second time this month. The reboot was accompanied by these system event log entries in LightsOut: Event Type Date Time ...
1
vote
1answer
91 views

What hardware profile tool exists for RHEL 5.x similar to `lscfg` or `system_profiler`?

I am looking for an equivalent tool or command to dump connected hardware (and optionally software) to a text or XML file for documenting system configuration on RHEL 5.8 specifically. I am used to ...
24
votes
5answers
2k views

Do I need to RAID Fusion-io cards?

Can I run reliably with a single Fusion-io card installed in a server, or do I need to deploy two cards in a software RAID setup? Fusion-io isn't very clear (almost misleading) on the topic when ...
7
votes
1answer
465 views

Enabling VMware EVC on Westmere E5645 CPU only accepts “Nehalem” mode

Take the following system, a Supermicro VMware ESXi host with Intel Westmere E5645 CPUs. Part of our deployment process is to set the appropriate Enhanced vMotion Capability (EVC) level for the ...
5
votes
1answer
164 views

Sudden and permanent increase in CPU input voltage, core temperature and fan speed without corresponding increase in load

One of my servers shows strange change in its monitored parameters. Last Sunday evening one of voltage measures ( in0 which I think is Vcore) suddenly increased by 20% from ~1V to ~1.20V on average. ...
0
votes
2answers
763 views

HP ProLiant DL320 G5 No Video Output, No Error LEDs, Swapped Motherboard, Same Issue

I have a HP ProLiant DL320 G5 Server that we have swapped out the motherboard with a working one, tried narrowing down removing different memory sticks, swapped out the onboard battery. I have a ...
2
votes
2answers
1k views

Dell Power Edge 2950 - E211 SBE LOG DISABLE DIMM6

Any idea of what this error E211 SBE LOG DISABLE DIMM6 could mean? Anyone have experienced this? I know that it sound pretty obvious, that is the 6th bank of my memory, and guest what: I have ...
0
votes
1answer
372 views

Dropping Packets Randomly

I have a SuperMicro Server based on the X9DR3-LN4F+ motherboard from SuperMicro. Original intentions for the system were quite different from what it has ended up serving, but that happens. It is ...
0
votes
1answer
95 views

Which hardware I need for building up a backup server, which is able to store 100TB+? [closed]

we are managing a pool of 40 PCs with an attached storage of up to 3 TB each. Every weekend we copy this data to 3 other PCs with several RAID5-systems inside to have some kind of backup. We chose 3 ...
3
votes
3answers
368 views

How to understand the LSI HBA connector specs?

When reading the specifications for the LSi SAS 9206-16e HBA, it says Storage Connectivity; Data Transfer Rates * 16 ports; 6Gb/s SAS 2.1 compliant SAS Bandwidth * Half Duplex 2400MB/s, x4, ...
0
votes
2answers
196 views

How do I re-enable the IPMI temperature sensors?

I've never had a problem reading temperature sensors with ipmitool on my server, but recently the temperature readings started showing up as disabled: # ipmitool sdr list Temp | disabled ...
23
votes
7answers
2k views

Is it necessary to burn-in RAM for server-class hardware?

Considering the fact that many server-class systems are equipped with ECC RAM, is it necessary or useful to burn-in the memory DIMMs prior to their deployment? I've encountered an environment where ...
2
votes
2answers
1k views

Can I put in laptop 2.5" SATA drives into an HP ProLiant DL380 G5?

I have an HP DL380 G5 server and I was wondering if can I put in standard notebook 2.5" SATA drives? In the front where the drives go, the SATA connections dont seem to fit.
2
votes
0answers
275 views

What might cause DIR $file to report “File not found” when DIR $dir shows the same file just fine?

I can DIR a file and it doesn't exist, but DIRing its directory, or a file in the same directory as it, works fine. Is this a hardware or software problem? If it's hardware, is it the drive or ...
0
votes
0answers
103 views

Performance drop after hours of runtime - how to detecting bottleneck

I am running a local database server for 1 client machine. My DB server runs redis (version 2.6.13) and mysql (5.5.31-30.3-log Percona Server (GPL), Release 30.3). I have 1 Client machine that runs a ...
1
vote
1answer
71 views

Screw size for Dell PowerConnect rack ears?

Does anyone know what the Screw size is (Thread and length) that Dell use on their PowerConnect Switches, to connect the ears to the switch? In particular the 6224 and 8224?
1
vote
1answer
197 views

Dell PowerEdge 850 PSU FAN always on [duplicate]

I have a Dell PE 850 wich is used unfrequently. I've noticed that the PSU fan is always running as soon as I plug the power cord in. So I have several questions regarding this behaviour: 1.) Is it ...
4
votes
3answers
607 views

RAID - buy spare disks at same time as originals?

When using RAID1, is it best practice to buy spare disks at the same time as the original disks to ensure you have the identical type in case they become unavailable in future?
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votes
1answer
193 views

What kind of hardware does Microsoft use to build Azure? [closed]

I'm curious about Azure virtual machines and Web/Worker role hardware. What kind of hardware (CPU, Disk, network cards, chipsets, etc..) does Microsoft use to run Azure on? Is there public information ...
13
votes
1answer
2k views

Hardware RAID controller cache battery failure frequency/lifetime?

I'm in an environment that contains many Supermicro servers equipped with Adaptec and LSI MegaRAID hardware RAID controllers. These controllers contain battery-backed cache modules to help boost write ...
-1
votes
1answer
55 views

Mounting ssd. Expectations vs reality about server load

I'v installed SSD on my server and moved tmp folder, mysql data folder and 2 most loaded websites(php) on it. I'v expected that server load will fall a little bit, but it seems that it is on the same ...
6
votes
1answer
5k views

How exactly does a SAS SFF-8087 breakout cable work? + RAID/connection questions

Please let me know if my question does not makes any sense as I am not sure if I am interpreting it correctly from my thoughts due to my lack of technical knowledge on this. If I am using a ...
1
vote
2answers
86 views

Install RAID1 without Second Hard Drive?

HP P410i Raid Card. I am waiting for a second hard drive to arrive. Is it possible to start with 1 hard drive and enable RAID1 without loosing data when the second drive is installed?
2
votes
4answers
7k views

HP ProLiant ML310e Gen8 early system initialization hangs on 90%

just unboxed a brand new HP ProLiant ML310e Gen8 Server. I can reach the iLO webinterface but the Server hangs on the early system initialization on 90 % with the status code 0114. I did not find any ...
-2
votes
1answer
328 views

HP DL360p Gen8 for low latency trading - what to upgrade? [closed]

I'm using HP DL360p Gen8 for low latency trading (but not ultra-low-latency!). It means that i'm working in frame about "10+ microseconds" and i don't care about "1-5 microsecond" or nanoseconds. I ...
2
votes
3answers
192 views

mdadm raid1, drive failure lost 14days worth of data?

I am rather confused. One evening I had a server which had died. I went to reboot it and noticed it was stuck on the "GRUB" boot screen. I then noticed a hard drive had failed. I put a new hard drive ...
19
votes
4answers
1k views

SSD head / cylinder / cluster details

A customer of ours makes industrial robots that run on very old, but stable, hardware and software. The only bottleneck has always been the hard drive in these moving machines. Due to constant ...
2
votes
1answer
215 views

What servers do I need to set up the following simple scenario? [duplicate]

I've founded a start-up recently and am about to add a little structure to it, regarding management, communication and data. I am a software developer and do not know any details about server ...
0
votes
1answer
207 views

Refresh a specific page in ilo 4

I use iLo 4 for my HP dl380 gen 8. I access iLo webpage using internet explorer 10. (Although I would gladly use another browser if anyone can recommend a better one for iLo access). How can I ...
0
votes
1answer
677 views

my ibm x3550 server can't find the hard drives

I recently purchased a used ibm x3550 server with two 2.5" SAS hard drives included. When I boot the server it doesn't recognise them. I get into the bios and I can't see them there. I try to install ...
0
votes
1answer
1k views

debian Read-only file system error

I logged on to my debian box and tried running some commands and I was presented with the following message. sudo: Can't open /var/lib/sudo/username/0: Read-only file system After doing some ...
0
votes
2answers
72 views

What Testing for Secondhand Servers?

I've recently bought a used rackmount 2950 server on Ebay to use for a specific project. I'm going to be spending a lot of time on this server, so I want to try and identify any major problems before ...
1
vote
2answers
266 views

24 Port Switch versus 4 x 8 Port Switch

While prices for switches in the end-customer sector are decreasing, I found that 24 port switches are much more expensive than multiple 8 port switches with the same speed. Are there any ...
0
votes
5answers
2k views

New office cabling: should we use CAT7 or CAT6a? [closed]

We are going to do the cabling in our new office building and we are thinking to lay down 10Gbit cables since we use HP switches that come with 10Gbit ethernet ports. We will also lay down few fiber ...
0
votes
3answers
725 views

Graphing temperature over time for HP iLo 4

Server: HP DL380p Gen 8, running latest iLo 4. One sensor, Sensor #25 for the HD Controller, tends to run a bit hot when compared to the other sensors. It tends to read 75 C. Caution temp is 100 C. ...
-1
votes
2answers
1k views

Choosing a processor for web server: what is more important, GHz or Cache size? [closed]

I'm choosing a new server that will run linux, nginx and php-fpm based web server. Mostly, all the work server is doing - rendering of Twig php templates. Current server has the fallowing processor, ...
3
votes
1answer
224 views

How to use a switch as a network tap?

I would like to tcpdump all traffic that my router does when it makes a firmware update. So I have taken a HP ProCurve 1800-8G switch and mirrored port 7 to port 8. I have connected: Internet ...
2
votes
2answers
287 views

RAID 10 — how do you know a drive is going or is bad?

I have some servers with a datacenter all the servers have RAID 10 setup. How do I know when one of the drives is going bad or is bad and needs to be replaced? EDIT: These servers are unmnaaged and ...
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votes
1answer
60 views

Is this a sign of a bad drive? [closed]

smartctl --attributes --log=selftest /dev/sda smartctl 5.43 2012-06-30 r3573 [x86_64-linux-2.6.32-379.22.1.lve1.2.17.el6.x86_64] (local build) Copyright (C) 2002-12 by Bruce Allen, ...
3
votes
2answers
216 views

What are cables/boxes called for listening in on a RJ45 cable?

I would like to capture the traffic from a router, so I assume there must exist a cable or hardware box with 3 RJ45 socks, where two of them are IN and OUT, and the third is for capturing device (a ...
-2
votes
1answer
510 views

HP proliant microserver won't boot

I was installing an ethernet driver for VPN on an HP Microserver (on PCI 1). Then, suddenly the server shut down while I was installing it. When I tried to boot it back up it only shows the health ...
1
vote
1answer
272 views

Hardware Virtualization Technology Enabling Issue

I have purchased an Intel i7 3770 and an Asus P8Z77-M Pro; for some Windows Server 2012 testing. In the BIOS I have enabled the "Intel Virtualization Technology", and have several Hyper-V based ...