Mark Whidby wrote: > 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 > ... Hi, I'm just posting the solution to this in case anybody else hits a similar problem. The errors were caused by a hardware configuration error. The "Default Transfer Clock" on the raid was set to 80 MHz yet filesystems bigger than 2 Tb require this to be 160 MHz. Once this was set correctly everything was fine. -- Mark Whidby Infrastructure Coordinator (Unix) - Physics/Chemistry/EAES/Mathematics Team Information Systems Faculty of Engineering and Physical Sciences