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  1. #1

    How to check raid?

    Hello,
    I've ordered dedicated host and it's look like they cheating me.
    I want to check some hardware details, but not really know how.

    From specification page:
    2 x 80Gb 7200rpm SATA Hard Disks RAID-1

    But this hosting work slowly that my VPS under heavy loading (~150k hit/day).
    From hdparm i've got this:

    [[email protected] httpd]# hdparm -tT /dev/sda2

    /dev/mapper/VolGroup00-LogVol01:
    Timing cached reads: 4204 MB in 2.00 seconds = 2102.39 MB/sec
    Timing buffered disk reads: 80 MB in 3.02 seconds = 26.51 MB/sec

    Well, let's look at lvm:
    [[email protected] httpd]# pvdisplay
    --- Physical volume ---
    PV Name /dev/sda2
    VG Name VolGroup00
    PV Size 73.47 GB / not usable 2.09 MB
    Allocatable yes (but full)
    PE Size (KByte) 32768
    Total PE 2351
    Free PE 0
    Allocated PE 2351
    PV UUID lfF2vS-D77D-Sb7D-Cs1b-noJy-bso1-JMf2ke


    This should mean that they use hardware RAID-1 which is represented as /dev/sda2?
    But i can't find anything about raid on /dev/sda from dmesg...

    [[email protected] httpd]# dmesg | grep -i raid
    md: Autodetecting RAID arrays.


    This is look strange... Need advice.

  2. #2
    Join Date
    Nov 2001
    Location
    Ann Arbor, MI
    Posts
    2,978
    A hardware RAID could conceivably be completely transparent from the shell. Ask your host provider how you can tell.
    -Mark Adams
    www.bitserve.com - Secure Michigan web hosting for your business.
    Only host still offering a full money back uptime guarantee and prorated refunds.
    Offering advanced server management and security incident response!

  3. #3
    Quote Originally Posted by bitserve View Post
    A hardware RAID could conceivably be completely transparent from the shell. Ask your host provider how you can tell.
    Even kernel boot message will not show it?
    Ok...
    But i think they cheating me, because my home notebook work faster that this super-duper "Dual Core with RAID-1" dedicated server. I've done small tests with gzip/ungzip. My loaded with application notebook (with opened browser, music player, ets.) works faster, than this unloaded dedicated server.

  4. #4
    here is how it looks in dmesg

    Code:
    csi0 : ioc0: LSISAS1068, FwRev=000a3100h, Ports=1, MaxQ=286, IRQ=169
      Vendor: ATA       Model: ST3808110AS       Rev: J   
      Type:   Direct-Access                      ANSI SCSI revision: 05
      Vendor: ATA       Model: ST3808110AS       Rev: J   
      Type:   Direct-Access                      ANSI SCSI revision: 05
      Vendor: Dell      Model: VIRTUAL DISK      Rev: 1028
      Type:   Direct-Access                      ANSI SCSI revision: 05
    SCSI device sda: 154296320 512-byte hdwr sectors (79000 MB)
    sda: Write Protect is off
    sda: Mode Sense: 03 00 00 08
    SCSI device sda: drive cache: write through
    SCSI device sda: 154296320 512-byte hdwr sectors (79000 MB)
    sda: Write Protect is off
    sda: Mode Sense: 03 00 00 08
    SCSI device sda: drive cache: write through
     sda: sda1 sda2
    sd 0:1:0:0: Attached scsi disk sda

  5. #5
    Join Date
    Oct 2006
    Location
    UK
    Posts
    218
    Put phpsysinfo on your server it may give you some clues...

    http://phpsysinfo.sourceforge.net/

  6. #6
    hwinfo:

    Code:
    24: PCI 208.0: 0100 SCSI storage controller
      [Created at pci.301]
      UDI: /org/freedesktop/Hal/devices/pci_1000_54
      Unique ID: oxTw.YyU0P+giqs5
      Parent ID: VCu0.YXdx3wZz9v9
      SysFS ID: /devices/pci0000:00/0000:00:01.0/0000:01:00.0/0000:02:08.0
      SysFS BusID: 0000:02:08.0
      Hardware Class: storage
      Model: "Dell SAS 5/iR Adapter RAID Controller"
      Vendor: pci 0x1000 "LSI Logic / Symbios Logic"
      Device: pci 0x0054 "SAS1068 PCI-X Fusion-MPT SAS"
      SubVendor: pci 0x1028 "Dell"
      SubDevice: pci 0x1f09 "SAS 5/iR Adapter RAID Controller"
      Revision: 0x01
      Driver: "mptsas"
      Driver Modules: "mptsas"
      I/O Ports: 0xec00-0xecff (rw,disabled)
      Memory Range: 0xfe9fc000-0xfe9fffff (rw,non-prefetchable)
      Memory Range: 0xfe9e0000-0xfe9effff (rw,non-prefetchable)
      Memory Range: 0xfea00000-0xfeafffff (ro,prefetchable,disabled)
      IRQ: 169 (2778601 events)
      Module Alias: "pci:v00001000d00000054sv00001028sd00001F09bc01sc00i00"
      Driver Info #0:
        Driver Status: mptsas is active
        Driver Activation Cmd: "modprobe mptsas"
      Config Status: cfg=new, avail=yes, need=no, active=unknown
      Attached to: #22 (PCI bridge)

  7. #7
    I've found problem. Write Cache on SAS 5/iR was disabled.
    Here is manual - http://www.tomasek.cz/software/SAS5iRperf/index.html

  8. #8
    Join Date
    Dec 2003
    Location
    Los Angeles
    Posts
    419
    Only enable the write cache if they have a battery on the card, most do not have the battery by default. If there is a power failure or your server locks up and you do a remote reboot your going to risk loosing data / corrupting data. Also hdparm numbers of under 30MB/s for sata drives is quite sad, write cache will not help this. Normal sata drives should yield at least 50 to 65MB/s. Its quite possible the server was overloaded from the vps while running that test.
    Daniel Pautz - WebNX, Inc. dan >< WebNX.com
    WebNX.com Enterprise Hosting Solutions Los Angeles and Manhattan NewYork based Servers
    High end Dedicated Servers at reasonable prices and a Premium network with 9x providers route optimized with the Noction IRP

  9. #9
    Join Date
    Jul 2007
    Location
    Dallas, TX
    Posts
    320
    lshw will definitely tell you what the raid card is and where on the mother board it is, and lots of other nice info too...

    cd /tmp
    mkdir lshw
    cd lshw
    wget http://dag.wieers.com/rpm/packages/l...l4.rf.i386.rpm
    rpm -i lshw*
    cd ..
    rm -rf lshw
    lshw | more
    https://ServersAndHosting.com
    Dedicated Servers | Guaranteed Hosting

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