This is a know problem.. As far as I know these errors mostly come during the boot-up if the scsi rdac handler is not there in the initrd image. You might want to try building scsi_dh_rdac into the initrd image. Thanks Babu Moger > -----Original Message----- > From: dm-devel-bounces@xxxxxxxxxx [mailto:dm-devel-bounces@xxxxxxxxxx] > On Behalf Of John Hughes > Sent: Friday, September 25, 2009 8:45 AM > To: dm-devel@xxxxxxxxxx > Subject: Dell MD3000/multipath - huge numbers of I/O errors > on boot > > I've got a Dell MD3000 SAS cabinet, connected with two SAS cables using > multipathd/dm-multipath. > > Most things work fine, but one problem I have is that the MD3000 wants > to do failover, it gets very shirty if I access the "ghost" path to a > LUN without doing some RDAC fancyness. > > The problem is that when the kernel discovers each LUN it tries to read > the partition table, which produces insane numbers of read failures on > boot. How can I silence them? > > [ 236.136435] scsi 4:0:0:14: Direct-Access DELL MD3000 > 0735 PQ: 0 ANSI: 5 > [ 236.158631] sd 4:0:0:14: [sdav] 142323712 512-byte hardware sectors: > (72.8 GB/67.8 GiB) > [ 236.158950] sd 4:0:0:14: [sdav] Write Protect is off > [ 236.159035] sd 4:0:0:14: [sdav] Mode Sense: 77 00 10 08 > [ 236.159456] sd 4:0:0:14: [sdav] Write cache: enabled, read cache: > enabled, supports DPO and FUA > [ 236.159888] sd 4:0:0:14: [sdav] 142323712 512-byte hardware sectors: > (72.8 GB/67.8 GiB) > [ 236.160199] sd 4:0:0:14: [sdav] Write Protect is off > [ 236.160285] sd 4:0:0:14: [sdav] Mode Sense: 77 00 10 08 > [ 236.160679] sd 4:0:0:14: [sdav] Write cache: enabled, read cache: > enabled, supports DPO and FUA > [ 236.161450] sd 4:0:0:14: [sdav] Attached SCSI disk > [ 236.161546] sd 4:0:0:14: Embedded Enclosure Device > [ 236.368374] sd 4:0:0:14: Attached scsi generic sg49 type 0 > ... > [ 240.579148] sd 3:0:1:14: [sdaf] Result: hostbyte=DID_OK > driverbyte=DRIVER_SENSE,SUGGEST_OK > [ 240.579323] sd 3:0:1:14: [sdaf] Sense Key : Illegal Request > [current] > [ 243.792964] sd 3:0:1:14: [sdaf] <<vendor>> ASC=0x94 ASCQ=0x1ASC=0x94 > ASCQ=0x1 > [ 245.265769] sd 3:0:1:14: [sdaf] Result: hostbyte=DID_OK > driverbyte=DRIVER_SENSE,SUGGEST_OK > [ 245.265940] sd 3:0:1:14: [sdaf] Sense Key : Illegal Request > [current] > [ 245.266215] sd 3:0:1:14: [sdaf] <<vendor>> ASC=0x94 ASCQ=0x1ASC=0x94 > ASCQ=0x1 > [ 245.825586] sd 3:0:1:14: [sdaf] Result: hostbyte=DID_OK > driverbyte=DRIVER_SENSE,SUGGEST_OK > [ 245.825752] sd 3:0:1:14: [sdaf] Sense Key : Illegal Request > [current] > [ 245.826017] sd 3:0:1:14: [sdaf] <<vendor>> ASC=0x94 ASCQ=0x1ASC=0x94 > ASCQ=0x1 > ... [ MANY MANY ERRORS REMOVED ] > [ 303.486849] sd 3:0:1:14: rdac: LUN 14 (unowned) > [ 303.494695] sd 4:0:0:14: rdac: LUN 14 (owned) > > # multipath -ll > ... > mpath43 (360024e80005b3b23000001b94ab0587f) dm-30 DELL ,MD3000 > [size=68G][features=1 queue_if_no_path][hwhandler=1 rdac] > \_ round-robin 0 [prio=3][active] > \_ 4:0:0:14 sdav 66:240 [active][ready] > \_ round-robin 0 [prio=0][enabled] > \_ 3:0:1:14 sdaf 65:240 [active][ghost] > ... > > > -- > dm-devel mailing list > dm-devel@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/dm-devel -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
