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  • Can enabling a RAID controller's writeback cache harm overall performance?

    - by Nathan O'Sullivan
    I have an 8 drive RAID 10 setup connected to an Adaptec 5805Z, running Centos 5.5 and deadline scheduler. A basic dd read test shows 400mb/sec, and a basic dd write test shows about the same. When I run the two simultaneously, I see the read speed drop to ~5mb/sec while the write speed stays at more or less the same 400mb/sec. The output of iostat -x as you would expect, shows that very few read transactions are being executed while the disk is bombarded with writes. If i turn the controller's writeback cache off, I dont see a 50:50 split but I do see a marked improvement, somewhere around 100mb/s reads and 300mb/s writes. I've also found if I lower the nr_requests setting on the drive's queue (somewhere around 8 seems optimal) I can end up with 150mb/sec reads and 150mb/sec writes; ie. a reduction in total throughput but certainly more suitable for my workload. Is this a real phenomenon? Or is my synthetic test too simplistic? The reason this could happen seems clear enough, when the scheduler switches from reads to writes, it can run heaps of write requests because they all just land in the controllers cache but must be carried out at some point. I would guess the actual disk writes are occuring when the scheduler starts trying to perform reads again, resulting in very few read requests being executed. This seems a reasonable explanation, but it also seems like a massive drawback to using writeback cache on an system with non-trivial write loads. I've been searching for discussions around this all afternoon and found nothing. What am I missing?

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  • HP Cue-Scanning Flow component freezes

    - by Nathan Fellman
    I am trying to scan with an HP network scanner (actually E6500 all-in-one). Whenever I try to scan, it starts up a flash screen with HP Scanning written all over it, which proceeds to do nothing. Digging in, I found that the process that gets stuck is hpqkygrp.exe, aka "HP CUE-Scanning Flow Component". This happened when I tried scanning from onenote or from the HP Solution Center. However, it seems that scanning from Windows' Fax and Scan utility works fine. As a (probably related) side-note, scanning directly from the scanner (using the buttons on its panel) doesn't work either. How can I keep this process from getting stuck?

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  • Placement of command line options in bash

    - by Nathan Rambeck
    I just starting using a Mac and have been frustrated that command line options are required immediately following the command so that this works: ls -la /usr but this doesn't: ls /usr -la ls: -la: No such file or directory Is there any way to change this? Or can someone tell me why the placement of options is agnostic on most Linux platforms, but not on Mac?

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  • HVM virtualization with PV drivers on XenServer

    - by Nathan
    Is it possible to create an HVM guest in XenServer 5.5 that uses PV drivers for disk and network without being fully paravirutalized? This should give me decent performance from the VM without having to jump through hoops to create a PV guest when a pre-built template doesn't exist. Since PV drivers exist for Windows, and XenServer provides templates for windows that use HVM virtualization this must be possible, I just don't see how to configure this myself.

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  • Intercept Apache communication

    - by Nathan Adams
    I am looking to develop a solution that eliminates potential spammers. The way this system will work is that it will watch connections and requests. Going into the specifics is more for stackoverflow, But, what I am interested in is if it is possible to tell Apache to pass the request over to my application first and give it the ability to accept/deny the request. Sure, it will make requests slower, but I think that is a trade off I am willing to take. I still want, however, Apache to run the request through any interpreters (such as PHP). The idea is that one wouldn't have to implement anti-spam measures on a per app basis but have an "umbrella" of spam protection.

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  • Thoughts on Apache log file sizes?

    - by Nathan Long
    Do you place any limits on the size of Apache log files - access.log and error.log? Specifically, can you give: Reasons to limit log file sizes Disk space Any other? Reasons NOT to limit log file sizes Research into performance issues or security breaches Any other? Methods of doing so Cron job that periodically deletes the file, or the first N lines? Any other? Anything you might salvage before deleting For example, grep out how many times a file was downloaded before deleting the access logs I'd like get the thoughts of experienced sysadmins before I do anything. (Marking as community wiki since this may be a matter of opinion.)

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  • Power supply for HP Workstation xw4100

    - by Nathan Adams
    Does anyone know if the HP Workstation xw4100 takes a "special" power supply? I know there was a time when everyone was using their own PSs with different pinouts, but I was under the impression that enough people complained and all the companies switched to standard power supplies.

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  • Is there a work around for the broken IE Tab in Firefox 3.6?

    - by Nathan Fellman
    My Firefox upgraded itself automatically to version 3.6, and I found that IE tab is broken there. Apparently IE tab is known to be broken in this version. Are there any known workarounds such as these? a different plugin with the same functionality a way to tell FF to behave in some legacy or compatibility mode for certain plugins a new version of IE tab In the meanwhile I'm glad that Chrome's current release supports plugins, and IE tab works there.

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  • How to search for one of two similar strings in Vim?

    - by Nathan Long
    This is a pretty simple regex question, I think. In Vim, if I want do a search that matches planA or planB, I know that I can do this: /plan[AB] This works because the regex allows for either A or B as its set of characters. But how can I specify one of two complete strings? For example, to match both planetAwesome and planetTerrible, this doesn't work: planet[Awesome|Terrible] ... because it's looking for planetA or planetw or planete, etc. Nor does this: planet['Awesome'|'Terrible'] This will match both of these, along with planetAnythingHereAsLongAsItsJustLetters: planet\([a-zA-Z]*\) But how can I match only strings that match planetAwesome or planetTerrible exactly?

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  • How can I compress a movie to a specific file size in Windows 7's Live Movie Maker?

    - by Nathan Fellman
    In previous versions of Windows Movie Maker I could take a raw video file and specify the file size to compress it to, and Movie Maker would compress it accordingly (with the appropriate loss in quality). Live Movie Maker, which comes with Windows 7, doesn't seem to have this option. I can only set specify the requested quality. Is there any way to specify the size of the target file for Windows Live Movie Maker?

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  • Windows Server 2008 - inexplicable system time jumps/glitches/inaccuracies

    - by Nathan Ridley
    I'm running a production web server on Windows Server 2008. On this server I have a database which logs certain user actions, but every now and again I inexplicably get database entries which, according to the record ID and the records immediately before and after, have the wrong time logged against them (7 days+ too old). For example, record ID 1001 will be for Dec 7, 11pm, 1002 will be for Dec 7, 11:01pm, then 1003 will be for Nov 28, 1:38am, then the next will be back on track again. The problem seems to occur in random records (or 2-3 records in a row) and crops up once every few days. This is absolutely baffling because there is only one place in the application that assigns this date/time value and it's simply the system UTC date. I have been synchronizing the system time to time-a.nist.gov (which I read in another article was a bit more reliable than the default time.windows.com) and it seems to occasionally get out of time anyway (3-4 minutes), but I'm speculating that occasionally the time server has a temporary glitch where the date changes to a drastically wrong value for a short space of time, then changes back. Either that, or the motherboard clock battery is screwed and the reason the time momentarily changes is that the motherboard loses the time and then the time synchronization puts it back again. Could either of my suspicions be right? Should I turn off time synchronization for a production server? Assigning dates to an event log where the dates are up to 2 weeks prior to the actual date is a severe problem I can't have when the next version of my application is released. Any suggestions or advice would be appreciated.

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  • Windows 7 - media sharing extremely flakey (XBox 360)

    - by Nathan Ridley
    I have constant headaches with Windows Media Library sharing, which I'm using to share my video library (a whole lot of AVI files on my computer's hard drive) with the XBox 360. I have the whole setup working, so setup and basic configuration is not an issue. The issue is that Windows Media Library frequently fails to notice additions and modifications to the "watched" folders. Not only that, but often after I've added something new to the library, it fails to transmit this new library information to the 360, as is demonstrated by the fact that, using that 360, I navigate to my video library and the new folders don't show up in the list. Often the only way to get the 360 to see the changes is to exit out of "Videos" on the 360, then remove all videos from Windows Media Library, go back into videos on the 360 to confirm that nothing is shared, then re-add a few videos (but not too many) in Windows Media Library, then go back into the videos in the 360. The whole thing is a real pain in the bum and I really wish I could just add all my videos to Windows Media Library and have it keep watch without me having to kick it, and have the 360 pick up changes without me having to constantly rebuild the library. Any ideas?

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  • Issue with Toshiba Satellite C50 A-1JM

    - by Nathan Hawkes
    I am having some odd problems with my Toshiba laptop. For the last two days, it has not loaded past the boot screen for hours, if at all. When I force the laptop off and switch it back on, it goes to the Preparing Automatic Repair process but will not complete the process and go to the desktop. However, this only happens when the battery is plugged in. When I remove the battery and run the laptop on power, it works without issue. Would this be a battery issue (given it works without the battery) or a hard drive issue (given it won't get past the boot screen)? If neither, what would you suggest as a solution?

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  • How do you set up DNS in Window Server 2008 in a Hyper-V environment?

    - by Nathan DeWitt
    I have a laptop running Server 2008 and Hyper-V. I have created a virtual machine that is also running Server 2008, that I used dcpromo to create as a domain controller. I disabled IPv6 because I had no idea how to enter a default address, and I just wanted to make a standalone MOSS dev environment. I have tried every combination of creating a virtual network on the host and then connecting to that in the VM, but I can't get the VM to communicate with the host and vice versa. No pinging, no copy and paste, nothing. Thanks. To update: My VM (which is its own DC) currently does not have a static IP. When I set the IP to static, I could not find anything that would let it talk to the host machine.

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  • Using SVN on windows without a keypair

    - by Paul Nathan
    Hi, I am trying to set up command-line access for my windows machine to a svn respository on a Unix box. The guides online all have the keypair method of accessing the repository. However, I don't personally like storing my keypairs, so I'm trying to figure out how to do this. Thoughts? Suggestions?

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  • How can I automatically update the title in an xterm running screen?

    - by Nathan Fellman
    This is a bit of a followup to this question. I'm working in tcsh within GNU screen in an xterm. I have the following in my .cshrc: alias res_t 'xtset -t %h:%d "(%u:%g)" %e' # reset titlebar res_t # reset title right now alias precmd res_t And this works fine! However, when I run screen I see that the title doesn't get updated with the current directory. How can I make screen update the xterm title?

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  • IE tab for Opera

    - by Nathan Fellman
    Is there any way to run IE in a tab in Opera? Much of the corporate website where I work is built for IE6 (WTF is up with that?), so if I want to access it using my default browser, it has to either be IE6 or Firefox with IE tab. Is there any way to do the same with Opera?

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  • How to completely remove MySQL from Windows?

    - by Nathan Long
    (I realize there are similarly-titled questions, but this one is really 'how do I reset the password', and this one doesn't specify an OS and has only gotten Linux-oriented answers.) On Windows XP, I just uninstalled MySQL and deleted the folder that it was installed in. I then rebooted and reinstalled MySQL. When it comes back up, it still has the databases it had before the uninstall. Where did it keep that database info? How do I completely remove MySQL and start over, as if I'd never installed it?

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  • diagnostic software for wifi adapter

    - by Nathan Fellman
    I'm having trouble with my wifi connection. Is there any software out there that can help me determine if the problem is in the drivers or in the hardware? Regretfully, I'm working on Vista Edit: The problem I'm having is that the Vista reports that the wireless radio is connected, shows an IP and all, the router also shows that the computer is connected, but there's no connectivity. I can't logon to the router, and I can't even ping it. When I ping it I get the response: General Failure I have tried connecting with and without various wireless security protocols. I have tried disabling the wireless adapter and re-enabling it from the Device Manager I have tried updating the driver None of this has helped. When I connect via Ethernet (with a cable, that is), everything works fine. Edit: I'm not using any firewall on the computer, that I'm aware of. The IP address for the WIFI adapter is similar to the one for the LAN adapter. They differ by one.

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  • Excessive denied requests for port 58322 in syslog

    - by Nathan C.
    My iptables is setup to block all unneeded ports as it should but I'm checking my syslog due to these random but all-to-frequent apache2 crashes and I noticed a lot of requests such as this. In all the archived syslogs that I have these are present from different IP addresses. There is a similar question with an accepted here: What service uses UDP port 60059? Jun 4 06:49:27 HOSTNAME kernel: iptables denied: IN=eth0 OUT= MAC=fe:fd:ad:ff:dd:95:c8:4c:75:f5:d6:3f:08:00 SRC=218.7.74.50 DST=MY.SERVER.IP.HERE LEN=129 TOS=0x00 PREC=0x00 TTL=115 ID=27636 PROTO=UDP SPT=9520 DPT=58322 LEN=109 Jun 4 06:49:31 HOSTNAME kernel: iptables denied: IN=eth0 OUT= MAC=fe:fd:ad:ff:dd:95:c8:4c:75:f5:d6:3f:08:00 SRC=95.160.226.177 DST=MY.SERVER.IP.HERE LEN=131 TOS=0x00 PREC=0x00 TTL=116 ID=31468 PROTO=UDP SPT=47642 DPT=58322 LEN=111 Jun 4 06:49:54 HOSTNAME kernel: iptables denied: IN=eth0 OUT= MAC=fe:fd:ad:ff:dd:95:c8:4c:75:f5:d6:3f:08:00 SRC=78.137.36.10 DST=MY.SERVER.IP.HERE LEN=131 TOS=0x00 PREC=0x00 TTL=118 ID=21872 PROTO=UDP SPT=57872 DPT=58322 LEN=111 Jun 4 06:50:14 HOSTNAME kernel: iptables denied: IN=eth0 OUT= MAC=fe:fd:ad:ff:dd:95:c8:4c:75:f5:d6:3f:08:00 SRC=111.253.217.11 DST=MY.SERVER.IP.HERE LEN=131 TOS=0x00 PREC=0x00 TTL=116 ID=28882 PROTO=UDP SPT=51826 DPT=58322 LEN=111 Jun 4 06:51:02 HOSTNAME kernel: iptables denied: IN=eth0 OUT= MAC=fe:fd:ad:ff:dd:95:c8:4c:75:f5:d6:3f:08:00 SRC=189.45.114.173 DST=MY.SERVER.IP.HERE LEN=131 TOS=0x16 PREC=0x00 TTL=113 ID=19985 PROTO=UDP SPT=41087 DPT=58322 LEN=111 Jun 4 06:51:09 HOSTNAME kernel: iptables denied: IN=eth0 OUT= MAC=fe:fd:ad:ff:dd:95:c8:4c:75:f5:d6:3f:08:00 SRC=87.89.202.28 DST=MY.SERVER.IP.HERE LEN=131 TOS=0x00 PREC=0x00 TTL=116 ID=7874 PROTO=UDP SPT=17524 DPT=58322 LEN=111 Jun 4 06:51:20 HOSTNAME kernel: iptables denied: IN=eth0 OUT= MAC=fe:fd:ad:ff:dd:95:c8:4c:75:f5:d6:3f:08:00 SRC=24.44.124.35 DST=MY.SERVER.IP.HERE LEN=131 TOS=0x00 PREC=0x00 TTL=118 ID=12978 PROTO=UDP SPT=45596 DPT=58322 LEN=111 Jun 4 06:51:22 HOSTNAME kernel: iptables denied: IN=eth0 OUT= MAC=fe:fd:ad:ff:dd:95:c8:4c:75:f5:d6:3f:08:00 SRC=81.174.48.236 DST=MY.SERVER.IP.HERE LEN=93 TOS=0x00 PREC=0x00 TTL=48 ID=0 DF PROTO=UDP SPT=21352 DPT=58322 LEN=73 Jun 4 06:51:23 HOSTNAME kernel: iptables denied: IN=eth0 OUT= MAC=fe:fd:ad:ff:dd:95:c8:4c:75:f5:d6:3f:08:00 SRC=124.107.61.84 DST=MY.SERVER.IP.HERE LEN=131 TOS=0x00 PREC=0x00 TTL=114 ID=13038 PROTO=UDP SPT=14357 DPT=58322 LEN=111 Jun 4 06:51:30 HOSTNAME kernel: iptables denied: IN=eth0 OUT= MAC=fe:fd:ad:ff:dd:95:c8:4c:75:f5:d6:3f:08:00 SRC=88.8.23.200 DST=MY.SERVER.IP.HERE LEN=123 TOS=0x00 PREC=0x00 TTL=117 ID=21062 PROTO=UDP SPT=4291 DPT=58322 LEN=103 Jun 4 06:51:54 HOSTNAME kernel: iptables denied: IN=eth0 OUT= MAC=fe:fd:ad:ff:dd:95:c8:4c:75:f5:d6:3f:08:00 SRC=80.202.244.234 DST=MY.SERVER.IP.HERE LEN=129 TOS=0x00 PREC=0x00 TTL=114 ID=339 PROTO=UDP SPT=14020 DPT=58322 LEN=109 I'm not overly experienced with server configuration and debugging, so I only just installed logcheck after reading that previous question. I guess my question is what steps should I take after reading this log info to 1) further protect myself, 2) understand if this could be causing any other problems with my VPS, and 3) use this data to help others?

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  • How do I change until the next underscore in VIm?

    - by Nathan Long
    If I have this text in vim, and my cursor is at the first character: www.foo.com I know that I can do: cw to change up to the first period, because a word (lowercase w) ends at any punctuation OR white space cW to change the whole address, because a Word (uppercase w) ends only at whitespace Now, what if I have this: stupid_method_name and want to change it to this? awesome_method_name Both cw and cW change the whole thing, but I just want to change the fragment before the underscore. My fallback technique is c/_, meaning 'change until you hit the next underscore in a search,' but for me, that also causes all underscores to be highlighted as search terms, which is slightly annoying. Is there a specifier like w or W that doesn't include underscores?

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