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Thread: How to check raid?
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01-19-2008, 11:10 AM #1Newbie
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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:
[root@localhost 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:
[root@localhost 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...
[root@localhost httpd]# dmesg | grep -i raid
md: Autodetecting RAID arrays.
This is look strange... Need advice.
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01-19-2008, 01:56 PM #2Web Hosting Master
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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!
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01-19-2008, 02:04 PM #3Newbie
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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.
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01-19-2008, 02:29 PM #4Newbie
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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
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01-19-2008, 02:32 PM #5Junior Guru
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Put phpsysinfo on your server it may give you some clues...
http://phpsysinfo.sourceforge.net/
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01-19-2008, 02:53 PM #6Newbie
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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)
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01-19-2008, 04:30 PM #7Newbie
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I've found problem. Write Cache on SAS 5/iR was disabled.
Here is manual - http://www.tomasek.cz/software/SAS5iRperf/index.html
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01-19-2008, 05:07 PM #8
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 – Southern California (Premium Equinix Based DC), Northern Utah (Large 120k Sq' WebNX ran) and NYC Based Servers
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01-19-2008, 09:14 PM #9Web Hosting Guru
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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
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