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Full Discussion: OEL5.5 hot add disk
Operating Systems Linux Red Hat OEL5.5 hot add disk Post 302592279 by Tommyk on Monday 23rd of January 2012 11:43:26 AM
Old 01-23-2012
OEL5.5 hot add disk
Hi All,

I have an issue when trying to hot-add a SAN disk to an oracle enterprise linux 5.5 server.

The storage array we are using is an HP 24000, we have no issues with the disk usage for both ASM and LVM setup, it is just a simple matter of not being able to scan for new disk when it is added without a reboot.

We have tried:
Code:
scan "- - -" > /sys/class/scsi_host/host(0 or 1)/scan

which errors with the following message:
Code:
unexpected response from lun 142, scan aborted

lun 142 happens to be the new added disk.

And also we have found a script called rescan_scsi_bus.sh, this runs successfully but does not add any new scsi devices.

I have a feeling on a reboot the scan is forced while loading the qla2xxx module, however we cannot remove the module and re-add it during server running time as this comes up with a "Fatal: module is in use" error message.

We have also tried to restart the multipathing deamon to see if the disk gets picked up, and also to run xpinfo, neither of which seem to see the disk.

I have raised a call with oracle support and have now been waiting 3 weeks without a response, however if i do get a useful reply i will post it here.

Cheers,
Tom
 

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LEARN ABOUT CENTOS

vgscan

VGSCAN(8)						      System Manager's Manual							 VGSCAN(8)

NAME

       vgscan - scan all disks for volume groups and rebuild caches

SYNOPSIS

       vgscan [-d|--debug] [-h|-?|--help] [--ignorelockingfailure] [--mknodes] [-P|--partial] [-v|--verbose]

DESCRIPTION

       vgscan  scans all SCSI, (E)IDE disks, multiple devices and a bunch of other disk devices in the system looking for LVM physical volumes and
       volume groups.  Define a filter in lvm.conf(5) to restrict the scan to avoid a CD ROM, for example.

       In LVM2, vgscans take place automatically; but you might still need to run one explicitly after changing hardware.

OPTIONS

       See lvm(8) for common options.

       --mknodes
	      Also checks the LVM special files in /dev that are needed for active logical volumes and creates any missing ones and removes unused
	      ones.

       --cache
	      Scan devices for LVM physical volumes and volume groups and instruct the lvmetad daemon to update its cached state accordingly.

SEE ALSO

       lvm(8), vgcreate(8), vgchange(8)

Sistina Software UK				     LVM TOOLS 2.02.105(2)-RHEL7 (2014-03-26)						 VGSCAN(8)
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