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