topic Re: RAID Volume in Linux in Operating System - Linux

RAID Volume in Linux

Caster Troy — Mon, 21 Jul 2008 11:43:56 GMT

Hey Guys,
I am new to Linux and facing a problem. I have a DL580 G3 with Linux AS4 on it. I don't know what RAID is configured and either it is a software RAID or a hardware RAID. There is however HP Smart Array present on the server which has an MSA connected to the server. I don't have any info about the volumes on that MSA and 1 of the disks in the MSA has failed. I have worked a lot with RAID volumes in Windows. Is there any ACU for Linux I don't even know how to check if it is installed or not. So you can imagine how much help i need out here. Can I just pull out the failed disk and put in the new one and will it start rebuild itself? Is there any limitation for different operating systems for this procedure?

Re: RAID Volume in Linux

Ivan Ferreira — Mon, 21 Jul 2008 13:24:24 GMT

Yes, there is ACU for Linux also. You should install the proliant support pack. To identify if you have software RAID, run:

# cat /proc/mdstat
Personalities :
unused devices:

In this case, no software RAID is present. The hpacucli package (part of proliant support pack), provides the hpacucli command, to check the smart array configuration, for example:

hpacucli
=> ctrl all show config detail

Smart Array P400 in Slot 1
Bus Interface: PCI
Slot: 1
Serial Number: PA2240M9SUF4VM
Cache Serial Number: PA2270H9SUEA9E
RAID 6 (ADG) Status: Enabled
RAID 6 (ADG) Enabler Status: Enabled
Controller Status: OK
Chassis Slot:
Hardware Revision: Rev D
Firmware Version: 2.08
Rebuild Priority: Medium
Expand Priority: Medium
Surface Scan Delay: 15 sec
Cache Board Present: True
Cache Status: OK
Accelerator Ratio: 25% Read / 75% Write
Total Cache Size: 512 MB
Battery Pack Count: 1
Battery Status: OK
SATA NCQ Supported: False

Array: A
Interface Type: SAS
Unused Space: 0 MB
Status: OK

Logical Drive: 1
Size: 68.3 GB
Fault Tolerance: RAID 1+0
Heads: 255
Sectors Per Track: 32
Cylinders: 17562
Stripe Size: 128 KB
Status: OK
Array Accelerator: Enabled
Unique Identifier: 600508B100104D3953554634564D0001
Disk Name: /dev/cciss/c0d0
Mount Points: /boot 101 MB

physicaldrive 1:1
Port: 2I
Box: 1
Bay: 1
Status: OK
Drive Type: Data Drive
Interface Type: SAS
Size: 72 GB
Rotational Speed: 10000
Firmware Revision: HPD5
Serial Number: 3NP0VSSL00009731JX2X
Model: HP DG072ABAB3
physicaldrive 1:2
Port: 2I
Box: 1
Bay: 2
Status: OK
Drive Type: Data Drive
Interface Type: SAS
Size: 72 GB
Rotational Speed: 10000
Firmware Revision: HPD5
Serial Number: 3NP0VFJ500009732NY9R
Model: HP DG072ABAB3

Re: RAID Volume in Linux

Caster Troy — Tue, 22 Jul 2008 08:17:04 GMT

Hi Ivan,
i got this output

cat /proc/mdstat
Personalities : [multipath]
md3 : active multipath cciss/c1d1p2[0] cciss/c2d1p2[1]
87875456 blocks [2/2] [UU]

md2 : active multipath cciss/c1d1p1[0] cciss/c2d1p1[1]
1376963136 blocks [2/2] [UU]

md1 : active multipath cciss/c1d0p2[0] cciss/c2d0p2[1]
87875456 blocks [2/2] [UU]

md0 : active multipath cciss/c1d0p1[0] cciss/c2d0p1[1]
1376963136 blocks [2/2] [UU]

unused devices:

what does this mean can you help

and i have smart array 642 installed so i guess i have hardware raid and i can replace the disk hot swap

Re: RAID Volume in Linux

Ivan Ferreira — Tue, 22 Jul 2008 12:00:21 GMT

That means that you are using "multipath" capabilities using "md" devices. You need multipath when you have multiple path access to the same disk. The output from /proc/mdstat indicates that you don't have software RAID.

>> And i have smart array 642 installed so i guess i have hardware raid and i can replace the disk hot swap

Probably yes but until you get the ouput of hpacucli we can't be sure.

Re: RAID Volume in Linux

Caster Troy — Tue, 22 Jul 2008 15:20:14 GMT

Ivan
I replaced the disk and the rebuild started but it is showing failed at the MSA500 G2 controller. Do I have to install ACU for Linux or is there any other way that I can find out at how much percent it failed.

Re: RAID Volume in Linux

skt_skt — Tue, 22 Jul 2008 18:49:41 GMT

how u r sure the rebuild started? Some time the new disk do not go through rebiuld if there is difference in the firmware level between the new and old disks.

Re: RAID Volume in Linux

Caster Troy — Sat, 26 Jul 2008 13:11:06 GMT

Hi Santosh,
When i replaced the disk in the MSA it displays the message Volume #1 Rebuild Started and then after 2-3 hrs it displays Volume #1 Rebuild Failed.

Re: RAID Volume in Linux

skt_skt — Sat, 26 Jul 2008 16:26:30 GMT

If you can afford a dowm time then you may boot through a ServeRAID application CD and check the RAID and rebuild error details.

Re: RAID Volume in Linux

Radu Prodan — Fri, 03 Oct 2008 09:50:19 GMT

Hello,

I hope I can find help on this forum. First, sorry for my English.
I am new to Linux and I have a Proliant DL180 G5 with Centos 5.2 on it.
I have 2 Sata HDD on it, raid 1, hardware.
When I make a rebuild (from Bios) I have to wait 180-240 minutes. Tell me please how can I make the rebuilding from Linux, because the downtime from bios rebuilding si very high. I don't know what raid controller I have (Smart Array E200 or Embbeded Sata). How can I find?
I try to install hpacucli with some steps from forums and I got this:

hpacucli
HP Array Configuration Utility CLI 7.70-12.0
Detecting Controllers...Done.
Type "help" for a list of supported commands.
Type "exit" to close the console.
=> ctrl all show config detail
Error: No controllers detected.

Please help me.
Thank you.
Radu

Re: RAID Volume in Linux

skt_skt — Fri, 03 Oct 2008 16:36:59 GMT

lspci lists the raid card installed on the system , assuming they are pci cards. raid rebould cant be controlled from LINUX unless it is a software RAID from LINUX. Your case is is a hardware RAID

Re: RAID Volume in Linux

Radu Prodan — Sat, 04 Oct 2008 10:44:35 GMT

Hello Santhosh,
Thank you for your answer.

lspci
...
00:1f.2 RAID bus controller: Intel Corporation 82801 SATA RAID Controller (rev 02)

So there are no tools to work with controller functions from linux? Rebuilding from bios is the last choice I want to make.

hpacucli is not working in this case?