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Subject:	RAID configuration problem
From:	Mark Whidby <[log in to unmask]>
Reply To:	Mark Whidby <[log in to unmask]>
Date:	Wed, 4 Nov 2009 10:50:40 +0000
Content-Type:	text/plain
Parts/Attachments:	text/plain (69 lines)

Hi,
I'm trying to configure a RAID box with 12 x 1 Tb disks on an SL 5.0 system
running kernel 2.6.18-8.1.8.el5 through this controller:

04:06.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 08)

However, whenever I configure more than 3 of the disks in a LUN I get SCSI errors.

For 4 disks in a RAID5 configuration:-

Nov  4 10:36:29 terra kernel:   Vendor: transtec  Model: PV610S12R1A       Rev: 347G
Nov  4 10:36:29 terra kernel:   Type:   Direct-Access                      ANSI SCSI revision: 05
Nov  4 10:36:29 terra kernel: sdq : very big device. try to use READ CAPACITY(16).
Nov  4 10:36:29 terra kernel: SCSI device sdq: 5858973696 512-byte hdwr sectors (2999795 MB)
Nov  4 10:36:29 terra kernel: sdq: Write Protect is off
Nov  4 10:36:29 terra kernel: SCSI device sdq: drive cache: write back
Nov  4 10:36:29 terra kernel: sdq : very big device. try to use READ CAPACITY(16).
Nov  4 10:36:29 terra kernel: SCSI device sdq: 5858973696 512-byte hdwr sectors (2999795 MB)
Nov  4 10:36:29 terra kernel: sdq: Write Protect is off
Nov  4 10:36:29 terra kernel: SCSI device sdq: drive cache: write back
Nov  4 10:36:29 terra kernel:  sdq: unknown partition table
Nov  4 10:36:29 terra kernel: sd 5:0:0:1: Attached scsi disk sdq
Nov  4 10:36:29 terra kernel: sd 5:0:0:1: Attached scsi generic sg16 type 0
Nov  4 10:36:31 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
Nov  4 10:36:31 terra kernel: end_request: I/O error, dev sdq, sector 5858973568
Nov  4 10:36:31 terra kernel: printk: 16 messages suppressed.
Nov  4 10:36:31 terra kernel: Buffer I/O error on device sdq, logical block 732371696
Nov  4 10:36:31 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
Nov  4 10:36:31 terra kernel: end_request: I/O error, dev sdq, sector 5858973568
Nov  4 10:36:31 terra kernel: Buffer I/O error on device sdq, logical block 732371696
Nov  4 10:36:32 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
Nov  4 10:36:32 terra kernel: end_request: I/O error, dev sdq, sector 5858973688
...
Nov  4 10:36:33 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
Nov  4 10:36:33 terra kernel: end_request: I/O error, dev sdq, sector 5858973688
Nov  4 10:36:33 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
Nov  4 10:36:33 terra kernel: end_request: I/O error, dev sdq, sector 5858973688
Nov  4 10:36:33 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
Nov  4 10:36:33 terra kernel: end_request: I/O error, dev sdq, sector 5858973568
...

For a LUN with 3 disks it's OK:-

Nov  4 10:33:26 terra kernel:   Vendor: transtec  Model: PV610S12R1A       Rev: 347G
Nov  4 10:33:26 terra kernel:   Type:   Direct-Access                      ANSI SCSI revision: 03
Nov  4 10:33:26 terra kernel:  target5:0:0: Beginning Domain Validation
Nov  4 10:33:26 terra kernel:  target5:0:0: Ending Domain Validation
Nov  4 10:33:26 terra kernel:  target5:0:0: FAST-80 WIDE SCSI 160.0 MB/s DT (12.5 ns, offset 127)
Nov  4 10:33:26 terra kernel: SCSI device sdp: 3905982464 512-byte hdwr sectors (1999863 MB)
Nov  4 10:33:26 terra kernel: sdp: Write Protect is off
Nov  4 10:33:26 terra kernel: SCSI device sdp: drive cache: write back
Nov  4 10:33:26 terra kernel: SCSI device sdp: 3905982464 512-byte hdwr sectors (1999863 MB)
Nov  4 10:33:26 terra kernel: sdp: Write Protect is off
Nov  4 10:33:26 terra kernel: SCSI device sdp: drive cache: write back
Nov  4 10:33:27 terra kernel:  sdp: unknown partition table
Nov  4 10:33:27 terra kernel: sd 5:0:0:0: Attached scsi disk sdp
Nov  4 10:33:27 terra kernel: sd 5:0:0:0: Attached scsi generic sg15 type 0

So, am I restricted to configuring this with sets of three disks?
Would moving to a later kernel or release of SL help?

Thanks.

-- 
Mark Whidby
Infrastructure Coordinator (Unix) - Physics/Chemistry/EAES/Mathematics Team
Information Systems
Faculty of Engineering and Physical Sciences

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