Hello, I have a problem with a file server setup, using mdadm multipath features. The host has two identical HBAs (LSI Logic U320, using mptspi module from 2.6.16), each of them is linked to a dual channel SCSI-to-SATA RAID Subsystem (http://www.infortrend.com/2_product/a16u-g1410.asp). This way, I aim to have a redundant IO path to the disks array to assure failover. I created the MD device using mdadm: mdadm --create /dev/md0 -n 2 --level=multipath /dev/sdb /dev/sdc I also tried with multipath-tools, and that works great until some point, where I get the following errors: sd 3:0:0:0: SCSI error: return code = 0xb0000 end_request: I/O error, dev sdc, sector 439427200 device-mapper: dm-multipath: Failing path 8:32. end_request: I/O error, dev sdc, sector 439427208 mptbase: ioc2: LogInfo(0x11070000): F/W: DMA Error mptbase: ioc2: IOCStatus(0x004b): SCSI IOC Terminated mptbase: ioc2: LogInfo(0x11070000): F/W: DMA Error mptbase: ioc2: IOCStatus(0x004b): SCSI IOC Terminated ... The part I'm curious about is the "SCSI error: return code = 0xb0000". What does that mean? This error appears randomly on both interfaces, under heavy I/O. And it does not seems to occur when using only one interface (/dev/sdb directly, rather than /dev/md0 or /dev/mapper/<id>. Is this a mpt or md related problem? Thanks in advance for any hint, -- Kilian CAVALOTTI Administrateur réseaux et systèmes UPMC / CNRS - LIP6 (C870) 8, rue du Capitaine Scott Tel. : 01 44 27 88 54 75015 Paris - France Fax. : 01 44 27 70 00 - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
