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  • Why does unpartitioned Hitachi HDS5C3020 drive start consuming 50% more power 15 minutes after boot?

    - by Pro Backup
    In a Debian 6.0.6 system there are 74 pieces of 2TB Toshiba DT01ABA200 drives. These drives are identified as Hitachi HDS5C3020BLE630 drives running firmware revision MZ4OAAB0. 64 Drives attached via HP SAS expander cards to an LSI 2008 SAS controller, another 5 drives are connected directly to the mainboard, 4 drives are connected to a Sil based PCI controller and last 1 drive is only powered and has no data cable connected. The controller LSI and Sil card's their onboard BIOS are both disabled and the mpt2sas and sata_sil modules are removed from the Linux debian 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux kernel. The mpt2sas module is loaded after boot using a modprobe command in /etc/rc.local. These 74 drives are not partitioned, neither formatted and also not mounted. The system consumes: with 0 drives: 70.6 - 70.9 Watt (also 15 minutes after boot); with 74 drives: 330 - 360 Watt, just after boot (is equivalent to 3.5 - 3.9W per drive in idle state); with 74 drives: 420 - 466 Watt, each time in the 15th minute of uptime (is equivalent to 4.7 - 5.3W per drive in idle state). The drive specification lists 4.7W as read/write, and 3.3W as idle power consumption. The increased power consumption is most likely on the 5V line, because after roughly 1 minute an "over current protection" (OCP) of the power supply (PSU) shuts down the power. The used PSU is a single rail model with an OCP of 122A on the 12V line and 55A on the 5V line. Regression: It doesn't matter whether the drive its APM value is set to disabled or 1 (maximum power saving). The operating system records no read/write activity in /proc/diskstats. The values there are identical (28 read, 0 write operations) as immediately after the modprobe operation. Can't test what happens when booting into the mainboard it's BIOS - to exclude any OS intervention - because the Super Micro X8SI6-F mainboard running firmware 06/27/12 has a bug that incorrectly reads a +74.0 C CPU sensor temperature as "High" in BIOS mode, and shuts down the power after 1 minute. What might be causing the drive read/write activity on all drives in the 15th minute after boot and how to prevent it from happening?

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  • Apache log - file does not exist

    - by Ivan
    I have quite a few of these in Apache logs piling up every day: [Mon Jun 09 20:42:58 2014] [error] [client 180.153.214.181] File does not exist: /home/user/public_html/ajax.googleapis.com, referer: http://www.mysite.com//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js I have over 200k visitors per day but a few of them like a dozen or so are generating the above error. I can't figure out what may be causing it. Checked the html code and it's all good so I ran out of ideas.

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  • Is it possible to re-order Cygwin tabs in Conemu

    - by Ashutosh Jindal
    I can re-order 'cmd' tabs in Conemu ( as per Is that possible to reorder tabs in ConEmu?), but the WinAltLeft and WinAltRight shortcuts do not work if the tab has a Cygwin shell in it. I have tried various combinations of hotkey modifiers but none of them seem to work with the Cygwin shell. This is problematic because most of the tabs in my ConEmu have Cygwin shells. I open a Cygwin shell using the following command: C:\cygwin\bin\mintty.exe -i /Cygwin-Terminal.ico -

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  • What single piece of software do you most admire, and why?

    - by Burton
    As a developer, I too often find fault with the software that I use day to day. Unintuitive interfaces, etc. But there are those rare exceptions. Regardless of whether the software in question is a programmers' tool, tell me about software you have used: What has inspired admiration? What software made you re-remember simplicity? (or whatever gauge of awesomeness works for you). Only one piece of software per post, please.

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  • Which Twitter app do you use?

    - by Jeff Fritz
    It seems like everyone is writing their own Twitter front-end application nowadays. So I must ask: What is your preferred Twitter front-end management application? Please discuss: Form Factor: Desktop, Mobile, Web based OS Support: Windows, Mac, Linux, iPhone, BlackBerry, etc Killer Feature that made you convert Please try to format your responses using the bullet points above. This way, we can all easily compare features. Please list 1 app per response

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  • E-mail sent with postfix are marked as spam.

    - by unkown
    I am using gmail as my email provider, and I only have gmail servers for my mx records. I don't like the 500 message per day cap. To address this issue I would like to run postfix on my Linux machine to only send email, incoming port 25 blocked by my firewall. I can send email, however google marks all messages sent with postfix as SPAM. How do I make sure that people know email sent with postfix is valid?

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  • Multiple IP stacks

    - by Aditya Sehgal
    I have a linux box with two ethernet interfaces (eth0 & eth1) with two corresponding IPs. As per my understanding, currently they are served by 1 IP stack. Is it possible to install another IP stack with IP Stack 1 handling ethernet interface eth0 and the other IP stack handling eth1.

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  • What are some "must have" Windows programs?

    - by hmemcpy
    Inspired by this question, what 3rd party essential software do you have on a Windows machine? One per answer please, and if you can, please provide the download/site link. Notice: Check the other pages before you propose a new answer, as your program might have been mentioned already. If so, vote for this answer instead of writing a new one.

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  • Windows Server 2008 Terminal Server CALs and Remote Desktop

    - by Chalkey
    Recently we have have installed Windows Server 2008 R2 on one of our development boxes at work. We have 10 Client Access Licence's for Microsoft Windows Terminal Server 2008. I'm under the impression that these licences will entitle us to have 10 concurrent connections to Remote Desktop. At the moment we are only allowed two. Can we have a RD connection per CAL? If so - how do we configure this? Thanks!

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  • Descending list ordered by file modification time

    - by LanceBaynes
    How can I generate a list of files in a directory [for example, "/mnt/hdd/PUB/"] ordered by the files modification time? [in descending order, the oldest modified file is at the lists end] ls -A -lRt would be great: https://pastebin.com/raw.php?i=AzuSVmrJ But if a file is changed in a directory, it lists the full directory, so the pastebined link isn't good [I don't want a list ordered by "directories", I need a "per file" ordered list] OS: OpenWrt [no Perl - not enough space for it :( + no "stat", or "file" command].

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  • Scanner Daily Duty Cycle

    - by juanp
    I'm comfused with the concept of 'Daily Duty Cycle'. For example if I have a scanner that the spec is: PPM (pages per minute): 90 and DDC (Daily Duty Cycle): 800. It means that in one day it will be able to scan only 800 pages?

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  • Why does writing a file to an NFS share send a COMMIT operation to the NFS server?

    - by Antonis Christofides
    I have a Debian squeeze (2.6.32-5-amd64) which is at the same time a NFS4 server and client (it mounts itself through NFS4). The local directory that leads directly to disk is /nfs4exports/mydir, whereas /nfs4mounts/mydir is the same thing mounted through NFS, using the machine's external IP address. Here is the line from fstab: 192.168.1.75:/mydir /nfs4mounts/mydir nfs4 soft 0 0 I have an application that writes many small files. If I write directly to /nfs4exports/mydir, it writes thousands of files per second; but if I write to /nfs4mounts/mydir, it writes 4 files per second or so. I can greatly increase speed if I add async to /etc/exports. (Writing a single large file to the NFS-mounted directory goes at more than 100 MB/s.) I examine the server statistics and I see that whenever a file is written, it is "committed" (this also happens with NFSv3): root@debianvboxtest:~# mount -t nfs4 192.168.1.75:/mydir /mnt root@debianvboxtest:~# nfsstat|grep -A 2 'nfs v4 operations' Server nfs v4 operations: op0-unused op1-unused op2-future access close commit 0 0% 0 0% 0 0% 10 4% 1 0% 1 0% root@debianvboxtest:~# echo 'hello' >/mnt/test1056 root@debianvboxtest:~# nfsstat|grep -A 2 'nfs v4 operations' Server nfs v4 operations: op0-unused op1-unused op2-future access close commit 0 0% 0 0% 0 0% 11 4% 2 0% 2 0% Now in the RFC, I read this: The COMMIT operation is similar in operation and semantics to the POSIX fsync(2) system call that synchronizes a file's state with the disk (file data and metadata is flushed to disk or stable storage). COMMIT performs the same operation for a client, flushing any unsynchronized data and metadata on the server to the server's disk or stable storage for the specified file. I don't understand why the client commits. I don't think that the "echo" shell built-in command runs fsync; if echo wrote to a local file and then the machine went down, the file might be lost. In contrast, the NFS client appears to be sending a COMMIT upon completion of the echo. Why? I am reluctant to use the async NFS server option, because it would apparently ignore COMMIT. I feel as if I had a local filesystem and I had to choose between syncing every file upon close and ignoring fsync altogether. What have I understood wrong?

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  • Scanner Daily Duty Cycle

    - by Juanp
    I'm comfused with the concept of 'Daily Duty Cycle'. For example if I have a scanner that the spec is: PPM (pages per minute): 90 and DDC (Daily Duty Cycle): 800. I am interested in scanning ONLY 10 hours continuously, what would it be the best choice: 90 * 60 * 10 = 54.000 or (800 / 24) * 10 = 333 It is very different results. what would it be the best option?

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  • Can two Identical devices be present on the same bus in any PCI Topology

    - by vaibbhav
    As per the PCI standard, devices are identified on the basis of Vendor Id, Device Id and the bus no. All devices of same type have identical vendor id and device id. If I put two such devices on the same bus say bus 0. How will the PCI Software Subsystem distinguish between the two? If such a case is not possible in PCI, then can such thing be possible through PCI Express Switch?

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  • Log parser for ftp server

    - by Sergei
    Can anyone suggest good log reporting software for Proftpd? I am looking for something at least as good as http://xferlogdb.sourceforge.net where log is fed into the database and dynamic web pages are built to retrieve historical data and statistics per user, time period and so on. Xferlogdb is very helpful , but unfortunately latest release is 2004

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  • Can two Identical devices be present on the same bus in any PCI Topology

    - by vaibbhav
    As per the PCI standard, devices are identified on the basis of Vendor Id, Device Id and the bus no. All devices of same type have identical vendor id and device id. If I put two such devices on the same bus say bus 0. How will the PCI Software Subsystem distinguish between the two? If such a case is not possible in PCI, then can such thing be possible through PCI Express Switch?

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  • restrict views of custome list by group in sharepoint

    - by Crash893
    Im pretty new to sharepoint and what i would like to do is create a huge master list of all our employees and then make diffrent "views" on that person depending on the persons group for example a new employe might have sallery info security info personel info contract info i would like to have all that in on row (per employee) but then when someone from the hr group logs in they can only see personel and salery or something like that If that is not an option is there a way to link tables across different lists?

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