<div>Dear all, I tried to use dm-multipath to access a iscsi-target (IET) with open-iscsi. However, I have no luck to make it work. I connect to the same target with 2 NIC and connect with open-iscsi as 2 devices (/dev/sdb & /dev/sdc). $ /sbin/scsi_id -g -u -s /block/sda 1ATA_____ST3120813AS_________________________________________3LS09TWT $ /sbin/scsi_id -g -u -s /block/sdb 14945540000000000325f3000000000000000000000000000 $/sbin/scsi_id -g -u -s /block/sdc 14945540000000000325f3000000000000000000000000000 where sda is internal SATA disk, </div> <div>sdb & sdc are iscsi devices of the same target thru 2 NIC. When I start multpathd, I found the following error message : Sep 25 17:03:34 liverpool multipathd: error calling out /sbin/scsi_id -g -u -s /block/sdb Then I tried to use "multipath -v2" but nothing happen. Please help! Thanks a lot! open-iscsi version : v1.1-619 linux : 2.6.17-1.2142_FC4smp Full log message: Sep 25 16:39:31 liverpool kernel: device-mapper: dm-multipath version 1.0.4 loaded Sep 25 16:39:43 liverpool kernel: device-mapper: dm-round-robin version 1.0.0 loaded Sep 25 17:01:23 liverpool kernel: scsi8 : iSCSI Initiator over TCP/IP, v1.1-619 Sep 25 17:01:24 liverpool kernel: Vendor: IET Model: VIRTUAL-DISK Rev: 0 Sep 25 17:01:24 liverpool kernel: Type: Direct-Access ANSI SCSI revision: 04 Sep 25 17:01:24 liverpool kernel: SCSI device sdb: 12582912 512-byte hdwr sectors (6442 MB) Sep 25 17:01:24 liverpool kernel: sdb: Write Protect is off Sep 25 17:01:24 liverpool kernel: SCSI device sdb: drive cache: write back Sep 25 17:01:24 liverpool kernel: SCSI device sdb: 12582912 512-byte hdwr sectors (6442 MB) Sep 25 17:01:24 liverpool kernel: sdb: Write Protect is off Sep 25 17:01:24 liverpool kernel: SCSI device sdb: drive cache: write back Sep 25 17:01:24 liverpool kernel: sdb: sdb1 Sep 25 17:01:24 liverpool kernel: sd 8:0:0:0: Attached scsi disk sdb Sep 25 17:01:24 liverpool iscsid: connection4:0 is operational now Sep 25 17:01:24 liverpool scsi.agent[4618]: disk at /devices/platform/host8/session4/target8:0:0/8:0:0:0 Sep 25 17:01:31 liverpool kernel: scsi9 : iSCSI Initiator over TCP/IP, v1.1-619 Sep 25 17:01:32 liverpool iscsid: picking unique OUI for the same target node name iqn.2006-09.com.myhost:storage.vg2-sn-abcde Sep 25 17:01:32 liverpool kernel: Vendor: IET Model: VIRTUAL-DISK Rev: 0 Sep 25 17:01:32 liverpool kernel: Type: Direct-Access ANSI SCSI revision: 04 Sep 25 17:01:32 liverpool kernel: SCSI device sdc: 12582912 512-byte hdwr sectors (6442 MB) Sep 25 17:01:32 liverpool kernel: sdc: Write Protect is off Sep 25 17:01:32 liverpool kernel: SCSI device sdc: drive cache: write back Sep 25 17:01:32 liverpool kernel: SCSI device sdc: 12582912 512-byte hdwr sectors (6442 MB) Sep 25 17:01:32 liverpool kernel: sdc: Write Protect is off Sep 25 17:01:32 liverpool kernel: SCSI device sdc: drive cache: write back Sep 25 17:01:32 liverpool kernel: sdc: sdc1 Sep 25 17:01:32 liverpool kernel: sd 9:0:0:0: Attached scsi disk sdc Sep 25 17:01:33 liverpool scsi.agent[4693]: disk at /devices/platform/host9/session5/target9:0:0/9:0:0:0 Sep 25 17:01:33 liverpool iscsid: connection5:0 is operational now Sep 25 17:03:34 liverpool multipathd: --------start up-------- Sep 25 17:03:34 liverpool multipathd: read /etc/multipath.conf Sep 25 17:03:34 liverpool multipathd: ramfs maxsize is 100706 Sep 25 17:03:34 liverpool multipathd: start DM events thread Sep 25 17:03:34 liverpool multipathd: initial reconfigure multipath maps Sep 25 17:03:34 liverpool multipathd: path checkers start up Sep 25 17:03:34 liverpool multipathd: refresh devmaps list Sep 25 17:03:34 liverpool multipathd: refresh paths list Sep 25 17:03:34 liverpool multipathd: dm-0 blacklisted Sep 25 17:03:34 liverpool multipathd: fd0 blacklisted Sep 25 17:03:34 liverpool multipathd: path hda not found in pathvec Sep 25 17:03:34 liverpool multipathd: ===== path hda ===== Sep 25 17:03:34 liverpool multipathd: md0 blacklisted Sep 25 17:03:34 liverpool multipathd: ram0 blacklisted Sep 25 17:03:34 liverpool multipathd: ram10 blacklisted Sep 25 17:03:34 liverpool multipathd: ram11 blacklisted Sep 25 17:03:34 liverpool multipathd: ram12 blacklisted Sep 25 17:03:34 liverpool multipathd: ram13 blacklisted Sep 25 17:03:34 liverpool multipathd: ram14 blacklisted Sep 25 17:03:34 liverpool multipathd: ram15 blacklisted Sep 25 17:03:34 liverpool multipathd: ram1 blacklisted Sep 25 17:03:34 liverpool multipathd: ram2 blacklisted Sep 25 17:03:34 liverpool multipathd: ram3 blacklisted Sep 25 17:03:34 liverpool multipathd: ram4 blacklisted Sep 25 17:03:34 liverpool multipathd: ram5 blacklisted Sep 25 17:03:34 liverpool multipathd: ram6 blacklisted Sep 25 17:03:34 liverpool multipathd: ram7 blacklisted Sep 25 17:03:34 liverpool multipathd: ram8 blacklisted Sep 25 17:03:34 liverpool multipathd: ram9 blacklisted Sep 25 17:03:34 liverpool multipathd: path sda not found in pathvec Sep 25 17:03:34 liverpool multipathd: ===== path sda ===== Sep 25 17:03:34 liverpool multipathd: vendor = ATA Sep 25 17:03:34 liverpool multipathd: product = ST3120813AS Sep 25 17:03:34 liverpool multipathd: rev = 2AAA Sep 25 17:03:34 liverpool multipathd: dev_t = 8:0 Sep 25 17:03:34 liverpool multipathd: size = 234441648 Sep 25 17:03:34 liverpool multipathd: h:b:t:l = 1:0:0:0 Sep 25 17:03:34 liverpool multipathd: tgt_node_name = Sep 25 17:03:34 liverpool multipathd: serial = 3LS09TWT Sep 25 17:03:34 liverpool multipathd: path checker = readsector0 (internal default) Sep 25 17:03:34 liverpool multipathd: state = 2 Sep 25 17:03:34 liverpool multipathd: getprio = (null) (internal default) Sep 25 17:03:34 liverpool multipathd: prio = 1 Sep 25 17:03:34 liverpool multipathd: getuid = /sbin/scsi_id -g -u -s /block/%n (internal default) Sep 25 17:03:34 liverpool multipathd: error calling out /sbin/scsi_id -g -u -s /block/sda Sep 25 17:03:34 liverpool multipathd: uid = (callout) Sep 25 17:03:34 liverpool multipathd: path sdb not found in pathvec Sep 25 17:03:34 liverpool multipathd: ===== path sdb ===== Sep 25 17:03:34 liverpool multipathd: vendor = IET Sep 25 17:03:34 liverpool multipathd: product = VIRTUAL-DISK Sep 25 17:03:34 liverpool multipathd: rev = 0 Sep 25 17:03:34 liverpool multipathd: dev_t = 8:16 Sep 25 17:03:34 liverpool multipathd: size = 12582912 Sep 25 17:03:34 liverpool multipathd: h:b:t:l = 8:0:0:0 Sep 25 17:03:34 liverpool multipathd: tgt_node_name = Sep 25 17:03:34 liverpool multipathd: serial = Sep 25 17:03:34 liverpool multipathd: path checker = readsector0 (internal default) Sep 25 17:03:34 liverpool multipathd: state = 2 Sep 25 17:03:34 liverpool multipathd: getprio = (null) (internal default) Sep 25 17:03:34 liverpool multipathd: prio = 1 Sep 25 17:03:34 liverpool multipathd: getuid = /sbin/scsi_id -g -u -s /block/%n (internal default) Sep 25 17:03:34 liverpool multipathd: error calling out /sbin/scsi_id -g -u -s /block/sdb Sep 25 17:03:34 liverpool multipathd: uid = (callout) Sep 25 17:03:34 liverpool multipathd: path sdc not found in pathvec Sep 25 17:03:34 liverpool multipathd: ===== path sdc ===== Sep 25 17:03:34 liverpool multipathd: vendor = IET Sep 25 17:03:34 liverpool multipathd: product = VIRTUAL-DISK Sep 25 17:03:34 liverpool multipathd: rev = 0 Sep 25 17:03:34 liverpool multipathd: dev_t = 8:32 Sep 25 17:03:34 liverpool multipathd: size = 12582912 Sep 25 17:03:35 liverpool multipathd: h:b:t:l = 9:0:0:0 Sep 25 17:03:35 liverpool multipathd: tgt_node_name = Sep 25 17:03:35 liverpool multipathd: state = 2 Sep 25 17:03:35 liverpool multipathd: prio = 1 Sep 25 17:03:44 liverpool multipathd: ===== path hda ===== Sep 25 17:03:44 liverpool multipathd: path checker = readsector0 (internal default) Sep 25 17:03:44 liverpool multipathd: : no usable fd Sep 25 17:03:44 liverpool multipathd: reconfigure multipath Sep 25 17:03:44 liverpool multipathd: refresh devmaps list Sep 25 17:03:44 liverpool multipathd: refresh paths list Sep 25 17:03:44 liverpool multipathd: dm-0 blacklisted Sep 25 17:03:44 liverpool multipathd: fd0 blacklisted Sep 25 17:03:44 liverpool multipathd: ===== path hda ===== Sep 25 17:03:44 liverpool multipathd: md0 blacklisted Sep 25 17:03:44 liverpool multipathd: ram0 blacklisted Sep 25 17:03:44 liverpool multipathd: ram10 blacklisted Sep 25 17:03:44 liverpool multipathd: ram11 blacklisted Sep 25 17:03:44 liverpool multipathd: ram12 blacklisted Sep 25 17:03:44 liverpool multipathd: ram13 blacklisted Sep 25 17:03:44 liverpool multipathd: ram14 blacklisted Sep 25 17:03:44 liverpool multipathd: ram15 blacklisted Sep 25 17:03:44 liverpool multipathd: ram1 blacklisted Sep 25 17:03:44 liverpool multipathd: ram2 blacklisted Sep 25 17:03:44 liverpool multipathd: ram3 blacklisted Sep 25 17:03:44 liverpool multipathd: ram4 blacklisted Sep 25 17:03:44 liverpool multipathd: ram5 blacklisted Sep 25 17:03:44 liverpool multipathd: ram6 blacklisted Sep 25 17:03:44 liverpool multipathd: ram7 blacklisted Sep 25 17:03:44 liverpool multipathd: ram8 blacklisted Sep 25 17:03:44 liverpool multipathd: ram9 blacklisted Sep 25 17:03:44 liverpool multipathd: ===== path sda ===== Sep 25 17:03:44 liverpool multipathd: path checker = readsector0 (internal default) Sep 25 17:03:44 liverpool multipathd: ===== path sdb ===== Sep 25 17:03:44 liverpool multipathd: path checker = readsector0 (internal default) Sep 25 17:03:44 liverpool multipathd: ===== path sdc ===== Sep 25 17:03:44 liverpool multipathd: path checker = readsector0 (internal default) Sep 25 17:03:44 liverpool multipathd: start up event loops Sep 25 17:03:44 liverpool multipathd: 0 pending event(s) -- Butler </div>