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• critical swap nagios

  - by Toby Joiner

  I installed nagios a very long time ago, and have started trying to use it now. I am getting this error: Current Status: CRITICAL (for 231d 16h 52m 49s) Status Information: SWAP CRITICAL - 100% free (0 MB out of 0 MB) Performance Data: swap=0MB;0;0;0;0 Current Attempt: 4/4 (HARD state) Last Check Time: 01-09-2011 13:26:34 Check Type: ACTIVE Check Latency / Duration: 0.125 / 0.004 seconds Next Scheduled Check: 01-09-2011 13:31:34 Last State Change: 05-22-2010 21:36:47 Last Notification: 01-09-2011 13:01:42 (notification 5521) Is This Service Flapping? NO (0.00% state change) In Scheduled Downtime? NO Last Update: 01-09-2011 13:29:32 ( 0d 0h 0m 4s ago) Is this normal? Should I be concerned? If more info is needed please let me know.

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• How can I compare effective power usage of two CPUs / CPU+Mobo+Mem combinations?

  - by einpoklum

  I have this server which does mostly file sharing (with the associated storage). No serious number crunching and it isn't the firewall. My current box has a Celeron D processor (Prescott 336 2.8 GHz); and I'm considering replacing it with a Pentium D (Smithfield 805 2.66 GHz) - for reasons which do not involve performance. How can I know whether one can expect a higher or lower power consumptipn for the change? And how can I estimate the power consumption for each option?

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• Upgrade no raid server to raid

  - by AZee

  I have just learned that our PDC has a single drive with 2 partitions. I also know that this drive has bad blocks as recorded in the event log. What I would like to do is to convert this to a RAID solution with a nice balance between economy and performance. I will admit that I have only configured servers with RAID from scratch, and have no experience upgrading an existing system into a RAID system. In fact, I'm not sure it is even possible. Since this is the PDC for 350+ workstations downtime is important. I'd like to hear from other System Administators how they would tackle this and their recommendations for all devices. At this time it seems to me that I can replace the existing drive and then restore from backup or install a controller, drives, configure the RAID an basically start from scratch. Thank you for taking your time. ~AZee

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• Static Content Caching in Sticky Session ?

  - by Ravi

  can we do Static Content caching in Sticky Session Servers. We use SqlStateServer to store the Session of the user. right now we are doing performance tuning in our application, so we decided to cache the static Content(images, css, js) for the applicaiton. so that it loads faster. Is it Good to cache the static content in Sticky Session ? If it's good, then can any one give me some links where i can read about it. right now i done following settings in my web config file <staticContent> <clientCache cacheControlCustom="public" cacheControlMode="UseMaxAge" cacheControlMaxAge="500.00:00:00" /> </staticContent> can this is the good code ? will it not affect our sticky session environment ? my goal is to cache the static images, css, Js for the application

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• Need hard disk recommendation for linux home server.

  - by neotracker

  Hello, I'm planing to build a little linux homeserver. It will mainly be used for storage and maybe as an media pc. I plan to build a software raid5 with 4 1.5TB or 2TB hard drives. I already decided to use the Western Digital Caviar Green 1.5 TB drive, but then I read about some problems with the WD green series about many drives failing and that they are not recommended for raid anyway. Of course, I couldn't find much facts on the issues so I thought I just ask here ;-) What hard drives would you recommended for a software raid5 setup? As I only need it for storage, the whole thing doesn't have to be too fast. So I prefer a cheap price and silence to great performance.

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• Can Windows 8 boot from FireWire?

  - by Holli

  I read many times Windows 7 is unable to boot from an external FireWire drive but I wonder if Windows 8 is able to do so. I need to run Windows on my Mac but only very few times so my idea was to move it all to an external drive. I have one of the first Intel Macs so running Windows in a virtual machine is not really fun. The performance is just too poor. Adding a Boot Camp partition to my internal drive is also not possible at the moment.

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• Monitor ESXi hosts with Nagios

  - by Kyle Brandt

  Does anyone recommend any methods for monitoring ESXi 4.1 hosts with Nagios? I have looked into SNMP but it seems to be in a pretty sorry state. Net-SNMP does not seem to be included and there is a built it SNMP daemon that I set up. However from the standard MIBs there only seems to really be network interface counters and the VMWare MIBs seem quite useless. Right now I am considering SNMP for the interface speed and trying the plugins listed at http://unimpressed.org/post/96949609/monitoring-esxi-performance-through-nagios . Anyone have a better idea? I would like to monitor the hosts directly, not through something like vCenter.

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• Windows DFS Limitations

  - by Phil

  So far I have seen an article on performance and scalability mainly focusing on how long it takes to add new links. But is there any information about limitations regarding number of files, number of folders, total size, etc? Right now I have a single file server with millions of JPGs (approx 45 TB worth) that are shared on the network through several standard file shares. I plan to create a DFS namespace and replicate all these images to another server for high availability purposes. Will I encounter extra problems with DFS that I'm otherwise not experiencing with plain-jane file shares? Is there a more recommended way to replicate these millions of files and make them available on the network? EDIT: I would experiment on my own and write a blog post about it, but I don't have the hardware for the second server yet. I'd like to collect information before buying 45 TB of hard drive space...

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• Linux Software Raid runs checkarray on the First Sunday of the Month? Why?

  - by mgjk

  It looks like Debian has a default to run checkarray on the first Sunday of the month. This causes massive performance problems and heavy disk usage for 12 hours on my 2TB mirror. Doing this "just in case" is bizzare to me. Discovering data out of sync between the two disks without quorum would be a failure anyway. This massive checking could only tell me that I have an unrecoverable drive failure and corrupt data. Which is nice, but not all that helpful. Is it necessary? Given I have no disk errors and no reason to believe my disks have failed, why is this check necessary? Should I take it out of my cron? /etc/cron.d# tail -1 /etc/cron.d/mdadm 57 0 * * 0 root [ -x /usr/share/mdadm/checkarray ] && [ $(date +\%d) -le 7 ] && /usr/share/mdadm/checkarray --cron --all --quiet Thanks for any insight,

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• How to increase Remote Desktop resolution?

  - by BugAlert

  I'm using Windows 7 on a PC and connect to it via Remote Desktop Connection for Mac by MS, using a Mac. On the Mac, I have a 27" Display with 2560 x 1440 px resolution. The PC has a high performance graphics card (one of those that needs an additional power supply). Both machines are connected via network cable to a router. So network should be insanely fast. However, the max resolution I can get is 1400 x 1050. The PC just has a old and bad 21" monitor connected to it. How can I increase the resolution to 2560 x 1440 to work fullscreen with the Apple LED Cinema Display via Remote Desktop? Maybe I shouldn't even ask, because I already experience some lag at the low resolution of 1400 x 1050. But I guess this can be resolved as well?

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• Manual TRIM Windows 7 on OCZ VERTEX 2 SATA II 2.5" SSD

  - by INTPnerd

  I have an OCZ VERTEX 2 SATA II 2.5" SSD with Windows 7 Professional installed on it. I am pretty sure TRIM is not working because my motherboard is the Asus M2N-SLI (not the Deluxe model) which does not support AHCI mode for the drive. Is there a utility that is compatible with this drive that I could possibly run once a day that would do something similar to a manual TRIM in order to keep the drive performance up? I could not find one specifically for this drive on the OCZ website. I did find a User-Initiated Garbage Collection wiper tool, but it is for a Vertex drive not Vertex 2. I tried to run it, but it said that wiper could not be run for all the drives on this system.

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• How can I set deadline as the I/O scheduler for USB Flash devices by using udev rules?

  - by ????

  I have set CFQ as the default I/O scheduler. I often get bad performance when I write data into a Flash device. This is resolved if I use deadline as the I/O scheduler for USB Flash devices. I can't always change the scheduler manually, right? I think writing udev rules is a good idea. Can someone please write rules for me? I want: When I plug in a USB device, detect the type of the device. If it is a portable USB hard disk, do nothing (I think if a device has more than one partitions, it always a portable hard disk. If it is a USB Flash device, set deadline as it's scheduler.

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• What does motherboard RAM slot colors mean?

  - by totymedli

  I always saw that the motherboard RAM slots are colored in pairs, but never know what does it means. I just put the 2 RAM in, and after a few tries it always worked. But after I tried to install a third one it always throws me a blue screen of death. Is there an order how should I install RAM to the borad? What does the colors mean? Does they indicate performance boost opportunity or are they just a guide for installation?

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• slow disk writes between host and guest

  - by Jure1873

  I've got a ubuntu (server kernel) on a amd x4, 4gb ram, 2x seagate sata 1 tb disks for testing virtual machines and the write performance is very slow. The two disks are in a software raid1 array, one small boot ext3 partition, 10gb system partition and the rest is a xfs partition (about 980) gb for data (virtual machines). If I'm copying files from the virtual machine to the host with rsync or scp the copy frequently stalls or goes at about 1mb/s. What's wrong? I've tried disabling barriers on xfs, increased logbufs, allocsize, but it seems nothing helps. The strange thing is that await (for example during copying) for sda is usually under 100, while for sdb is around 400. Any ideas on what could be wrong / what could I do to improve this setup?

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• recommendations for a lightweight linux distribution for a test server

  - by Jack

  I'm planning on setting up a test server to experiment with some application servers (tomcat/jboss/...) and with some portals. Now the machine I've set aside for this is lightweight CPU/GPU wise(Atom D510, 4 gigabyte ram, 500 GiB hdd, onboard GPU). But it should suffice for most things, I'm more interested in the stability of JBoss/Tomcat for my purposes than the stability. However I'm having a bit of trouble picking an appropriate distribution size/performance/setup time wise/security wise since it seems I can't sneeze without another distribution popping up. I've been thinking about going for Fedora since I've read that that distribution has been optimized for Atom, but I'm not really familiar with it. My experience with Linux has mostly been limited to Ubuntu and some tinkering with puppylinux. I'm not afraid to get my hands dirty using the command line. I'm not planning on starting a discussion per se, mostly the pros/cons that people have encountered with some distributions

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• ESXi with non-headless VM

  - by Mike

  I'm going to receive a Xeon Server/Workstation soon and I was thinking about installing ESXi to host some server applications that I want (ex: SVN server, Web server, media server, etc). Most of these will be headless VM's. My question is: on top of all these headless VM's, is it possible for ESXi to have another VM that would be non-headless (so that it will output video through the VGA/DVI port)? Or are all VM's within ESXi only accessible through remote connections? I'll be using this non-headless VM like a regular workstation: browsing, development, media, gaming maybe. The other alternative I was thinking about is to install a very lightweight operating system and have the headless VM's running in Virtualbox. If it is possible to have have a non-headless VM, what would be the performance compared to a regular workstation? Noticeable or not when gaming?

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• useful JMX metrics for monitoring WebSphere Application Server (and apps inside it)?

  - by Justin Grant

  When managing custom Java applications hosted inside WebSphere Application Server, what JMX metrics do you find most useful for monitoring performance, monitoring availability, and troubleshooting problems? And how do you prefer to slice and visualize those metrics (e.g. chart by top 10 hosts, graph by app, etc.). The more details I can get, the better, as I need to specify a standard set of reports which IT can offer to owners of applications hosted by IT, which those owners can customize but many won't bother. So I'll need to come up with a bunch of generally-applicable reports which most groups can use out-of-the-box. Obviously there's no one perfect answer to this question, so I'll accept the answer with the most comprehensive details and I'll be generous about upvoting any other useful answer. My question is WebSphere-specific, but I realize that most JMX metrics are equally applicable across any container, so feel free to give an answer for JBoss, Tomcat, WebLogic, etc.

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• Is it wise to use SSHDs (Solid state hybrid drives) on a server?

  - by Seb

  I have a bunch of servers with very heavy I/O that currently use SATA3/SAS drives, but do suffer from I/O wait on the SATA drives, and I have just been alerted to the existence of SSHDs which cost the same for 1TB as the 1TB SATA drives that we currently use. However, previously (until Seagate shipped their first 3.5" SSHD in March) they seemed to be exclusively for Netbooks/Notebooks, which leads me to suspect they're not exactly built for the heavy I/O they'd be in for with my servers. So, would an SSHD give me a performance boost over my SATA3 drives in a heavy I/O environment (such as multiple very large high speed file transfers) or is it best to stick with SATA3 with I/O wait??

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• Windows script to create directories of 3,000 files

  - by uhpl1

  We have some email archiving that is dumping all the emails into a directory. Because of some performance reasons with the server, I want to setup an automated task that will run a script once a day and if there is more than 3,000 (or whatever number) of files in the main directory, create a new directory with the date and move all the main directory files into it. I'm sure someone has already written something similar, so if anyone could point me at it that would be great. Batch file or Powershell would both be fine.

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• OPTIONS * HTTP/1.0 APACHE

  - by Abby E

  I been noticing a lot lately in my /server-status the OPTIONS * HTTP/1.0 has been coming up lately a lot. I'm running Ubuntu 12.04 with the latest apache/php/MySQL. I'm not sure what they're for but I would like to see if it would effect performance by some how turning it off. I host some stuff that is accessed a lot that uses PHP/MySQL (600 rps). I'm not sure what it's there for but I do see the local 127.0.0.1 IP, so I assume it's something running local. What is it? How do your turn it off? If turned off how would it effect performance? The list below is a small example of it. (127.0.0.1 REMOVED.(null) hostname has been removed) 211-0 - 0/0/1035 . 24.28 240189 0 0.0 0.00 0.18 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 212-0 - 0/0/51274 . 677.97 202960 0 0.0 0.00 8.99 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 213-0 - 0/0/419 . 11.85 240424 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 214-0 - 0/0/240 . 7.96 240552 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 215-0 - 0/0/309 . 9.29 240492 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 216-0 - 0/0/98510 . 1258.25 177391 0 0.0 0.00 17.29 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 217-0 - 0/0/338 . 10.18 240464 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 218-0 - 0/0/345 . 10.27 240469 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 219-0 - 0/0/118538 . 1507.99 168914 0 0.0 0.00 20.80 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 220-0 - 0/0/98452 . 1259.10 177412 0 0.0 0.00 17.29 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 221-0 - 0/0/384 . 10.84 240453 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 222-0 - 0/0/331 . 10.03 240477 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 223-0 - 0/0/314 . 9.04 240493 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 224-0 - 0/0/75193 . 975.24 188845 0 0.0 0.00 13.18 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 225-0 - 0/0/362 . 10.62 240457 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 226-0 - 0/0/125773 . 1593.26 165647 0 0.0 0.00 22.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 227-0 - 0/0/82541 . 1063.89 185092 0 0.0 0.00 14.48 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 228-0 - 0/0/409 . 11.50 240436 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 229-0 - 0/0/219 . 7.38 240581 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 230-0 - 0/0/357 . 10.48 240458 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 231-0 - 0/0/469 . 12.39 240411 0 0.0 0.00 0.08 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 232-0 - 0/0/394 . 11.32 240445 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 233-0 - 0/0/276 . 9.00 240510 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 234-0 - 0/0/245 . 8.51 240536 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 235-0 - 0/0/215 . 7.45 240555 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 236-0 - 0/0/370 . 11.00 240443 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 237-0 - 0/0/400 . 10.96 240446 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 238-0 - 0/0/266 . 8.51 240531 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 239-0 - 0/0/304 . 9.81 240499 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 240-0 - 0/0/446 . 12.47 240421 0 0.0 0.00 0.08 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 241-0 - 0/0/19741 . 282.90 230130 0 0.0 0.00 3.45 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 242-0 - 0/0/98503 . 1259.43 177404 0 0.0 0.00 17.28 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 243-0 - 0/0/251 . 7.93 240551 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 244-0 - 0/0/273 . 8.42 240534 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 245-0 - 0/0/118485 . 1508.14 168950 0 0.0 0.00 20.79 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 246-0 - 0/0/294 . 9.35 240509 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 247-0 - 0/0/413 . 12.34 240437 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 248-0 - 0/0/258 . 8.55 240529 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 249-0 - 0/0/303 . 9.77 240485 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0

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• Linux IO scheduler on databases with RAID

  - by Raghu

  Hi, I have a linux database(MySQL) server(Dell 2950) with a 6-disk RAID 10. The default IO scheduler on it is CFQ. However, from what I have read and heard, there is no need for a scheduler like CFQ when reordering/scheduling is also done by underlying RAID controller; on the contrary since it does not account underlying RAID configuration into account performance may actually degrade with CFQ. The primary concern is to reduce CPU usage and improve throughput. Also, I have seen recommendations of using noop/deadline IO scheduler for databases primarily because of the nature of their R/W access.

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• Does Intel Smart Response provide any statistics on the cache usage?

  - by Tom Seddon

  I've set up my Z68-based Core i7 PC with a 60GB SSD dedicated as a Smart Response cache drive. Is there any way I can get any statistics out of it? It would be nice to have some information on how much cache space is actually being used, maybe how much of it was actually accessed recently, and how many reads in general are coming from the SSD rather than from the mechanical disk. These statistics might help to quickly provide some evidence for or against the use of Smart Response, without my having to reinstall Windows on the SSD (etc.) to find out. The Windows ReadyBoost feature has some performance counters you can access via the Windows 7 perfmon tool, for example, which is the kind of thing I'm hoping is somehow available. Smart Response provides no perfmon counters, though, and the Intel Rapid Storage Utility tells you pretty much nothing except that Smart Response is switched on.

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• Using a CF card as an IDE HDD

  - by dartacus

  I have an old Sony laptop (Vaio TR1-MP) that I like. The HDD has died and since it's a hard-to-find 1.8" IDE hard drive I'm considering buying one of those little CF card adaptors and a 16gb CF card. The total cost of that is about £30 and replacement HDDs for this model are far pricier. Has anyone replaced their HDD with a CF card in this way, and, crucially, is the performance utterly horrible afterwards? ;-) I've seen a couple of threads which hint it's possible but the advice eventually given was just to buy a SSD, but I'm not even sure if its possible to get a 1.8" SSD with an IDE connector that'll fit my laptop. (I freely admit that the most sensible thing to do would be to bin it and just buy a cheap netbook which would be smaller, faster and lighter than the sony, but it does have a very nice widescreen display and dammit I just like it !) Thanks, G

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• How do you explain ethernet cable problems to non networking people?

  - by Bryan McLemore

  We've recently been doing a large network migration in our datacenter. We've had a few cables in this start to deliver really bad pings (in excess of 500ms on a LAN) before they could be replaced. The cables we were replacing weren't made the best. They where all hand made and the runs were so short on some of them that the bend radius was definitely too tight. Some of them ran in bundles right in front of the heat exhaust of the power supplies. The cables were running ok until we started pulling the ones surrounding them out. Then a few started having the problem I mentioned above degrading performance and causing reliability issues. I'm trying to figure out the best way to explain this to non networking people. Is there any documentation that people could recommend or other methods?

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• What is the Optimal Server Configuration for Split-Path Testing?

  - by doug

  I am far from an expert on Apache or any server for that matter, so i apologize if this question is poorly worded, which it likely is. We have always relied on a vendor for split-path testing (aka "AB Testing"). If you're not familiar with that term, it's a form of marketing research in which you slightly modify one of your web pages (usually one nearest the point of conversion), say for instance, by changing the position of the "Buy Now" button or its color/contrast/texture, then serving one of those two pages to a given user based on random selection. By doing split-path testing ourselves, I suspect we can do it far more cheaply and increase cycle times as well. What is the optimal set-up for these tests? "Optimal" is based on the following criteria: how quickly/easily new tests can be set-up and put online; and minimal disruption to overall site performance

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