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Full Discussion: FC Luns rescan issue
Operating Systems Linux Red Hat FC Luns rescan issue Post 302950974 by sumit6in on Thursday 30th of July 2015 06:04:36 PM
Old 07-30-2015
FC Luns rescan issue
Hi all

we have two Rac cluster in our environment. we have asked our storage team to provide luns for adding space to our rac. Right now in one our server luns are visible but not in another. But if i see dmesg in servers i can see disk attached but not able to see them. even iostat showing disks as well, multipath -ll not showing those disk. all online rescan has been done and multipath.conf blacklist has been removed.

env- redhat 5.5 - 2.6.18-371.9.1.el5PAE

lsscsi output -

Code:
[3:0:2:27]   disk    IBM      2107900          1.32  -
[3:0:2:28]   disk    IBM      2107900          1.32  -
[3:0:2:29]   disk    IBM      2107900          1.32  -
[3:0:2:30]   disk    IBM      2107900          1.32  -
-----------------------------------------------------------
[4:0:2:27]   disk    IBM      2107900          1.32  -
[4:0:2:28]   disk    IBM      2107900          1.32  -
[4:0:2:29]   disk    IBM      2107900          1.32  -
[4:0:2:30]   disk    IBM      2107900          1.32  -

dmesg error

Code:
SCSI device sdcz: 285212672 512-byte hdwr sectors (146029 MB)
sdcz: Write Protect is off
sdcz: Mode Sense: ed 00 00 08
SCSI device sdcz: drive cache: write back
sdcz: detected capacity change from 0 to 146028888064
SCSI device sdda: 285212672 512-byte hdwr sectors (146029 MB)
sdda: Write Protect is off
sdda: Mode Sense: ed 00 00 08
SCSI device sdda: drive cache: write back
sdda: detected capacity change from 0 to 146028888064
SCSI device sddb: 285212672 512-byte hdwr sectors (146029 MB)
sddb: Write Protect is off
sddb: Mode Sense: ed 00 00 08
SCSI device sddb: drive cache: write back
sddb: detected capacity change from 0 to 146028888064
SCSI device sddc: 285212672 512-byte hdwr sectors (146029 MB)
sddc: Write Protect is off
sddc: Mode Sense: ed 00 00 08
SCSI device sddc: drive cache: write back
sddc: detected capacity change from 0 to 146028888064
SCSI device sddd: 285212672 512-byte hdwr sectors (146029 MB)
sddd: Write Protect is off
sddd: Mode Sense: ed 00 00 08
SCSI device sddd: drive cache: write back
sddd: detected capacity change from 0 to 146028888064
SCSI device sdde: 285212672 512-byte hdwr sectors (146029 MB)
sdde: Write Protect is off
sdde: Mode Sense: ed 00 00 08
SCSI device sdde: drive cache: write back
sdde: detected capacity change from 0 to 146028888064
SCSI device sddf: 285212672 512-byte hdwr sectors (146029 MB)
sddf: Write Protect is off
sddf: Mode Sense: ed 00 00 08
SCSI device sddf: drive cache: write back
sddf: detected capacity change from 0 to 146028888064
SCSI device sddg: 285212672 512-byte hdwr sectors (146029 MB)
sddg: Write Protect is off
sddg: Mode Sense: ed 00 00 08
SCSI device sddg: drive cache: write back
sddg: detected capacity change from 0 to 146028888064

iostat -

Code:
sddd              0.00         0.00         0.00         16          0
sdde              0.00         0.00         0.00         16          0
sddf              0.00         0.00         0.00         16          0
sddg              0.00         0.00         0.00         16          0
sdcz              0.00         0.00         0.00         16          0
sdda              0.00         0.00         0.00         16          0
sddb              0.00         0.00         0.00         16          0
sddc              0.00         0.00         0.00         16          0

any pointers would be helpful.
Last edited by Corona688; 07-30-2015 at 07:38 PM..
 

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