03-11-2011
How to Find what HBA is configured on Linux?
Hi
I am working in an environment where there are many redhat physical and virtual machines, mostly Redhat 4. These servers have LUNs attached. The external storage can be EMC, NetApp or Par3.
My question is that when Storage Administrator informs that a new LUN has been presented to a particular Redhat Linux server
(1) how do I know what is the LUN ID.
(2) how do I know what kind of HBA is attached to my server.
(3) how do I scan for new LUNs.
Please guide me I have searching over the net for a while, lastly is there a guide/doc on this, the storage guide from Redhat are not in to much detail.
Thanks and regards
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LEARN ABOUT CENTOS
scsi-rescan
RESCAN-SCSI-BUS.SH(1) User Commands RESCAN-SCSI-BUS.SH(1)
NAME
rescan-scsi-bus.sh - script for adding and removing SCSI devices without rebooting
SYNOPSIS
rescan-scsi-bus.sh [options] [host [host ...]]
OPTIONS
-a, --alltargets
scan all targets, not just currently existing [default: disabled]
-d enable debug [default: 0]
-l activates scanning for LUNs 0--7 [default: 0]
-L NUM activates scanning for LUNs 0--NUM [default: 0]
-w, --wide
scan for target device IDs 0--15 [default: 0--7]
-c enables scanning of channels 0 1 [default: 0 / all detected ones]
-r, --remove
enables removing of devices [default: disabled]
-f, --flush
flush failed multipath devices [default: disabled]
-i, --issue-lip
issue a FibreChannel LIP reset [default: disabled]
-u, --update
look for existing disks that have been remapped
-s, --resize
look for resized disks and reload associated multipath devices, if applicable
--forcerescan
rescan existing devices
--forceremove
remove and readd every device (DANGEROUS)
--nooptscan
don't stop looking for LUNs is 0 is not found
--color
use coloured prefixes OLD/NEW/DEL
--hosts=LIST
scan only host(s) in LIST
--channels=LIST
scan only channel(s) in LIST
--ids=LIST
scan only target ID(s) in LIST
--luns=LIST
scan only lun(s) in LIST
--sync, --nosync
issue a sync / no sync [default: sync if remove]
--attachpq3
tell kernel to attach sg to LUN 0 that reports PQ=3
--reportlun2
tell kernel to try REPORT_LUN even on SCSI2 devices
--largelun
tell kernel to support LUNs > 7 even on SCSI2 devs
--sparselun
tell kernel to support sparse LUN numbering
Host numbers may thus be specified either directly on cmd line (deprecated) or or with the --hosts=LIST parameter (recommended).
LIST: A[-B][,C[-D]]... is a comma separated list of single values and ranges (No spaces allowed.)
SEE ALSO
rescan-scsi-bus.sh Homepage: http://www.garloff.de/kurt/linux/#rescan-scsi
sg3_utils Homepage: http://sg.danny.cz/sg
rescan-scsi-bus.sh 1.57 leden 2014 RESCAN-SCSI-BUS.SH(1)