centos-bounces@centos.org wrote on 31.08.2010 11:43:50:


> Gabriel Tabares <gabriel.tabares@roboreus.com> 
> Gesendet von: centos-bounces@centos.org

> 
> 31.08.2010 11:44
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> [CentOS] Automatically detecting LUNs without a reboot
> 

> Hi everybody.


> I have an HP StorageWorks array connected to
one of my servers,

> connected via an LSI controller (lspci reports: SCSI storage controller:

> LSI Logic / Symbios Logic SAS1068E PCI-Express Fusion-MPT SAS (rev
08))

> on an HP DL385 running CentOS 5.5 x86_64.


> I have set up multipath and all is working but,
when I create a snaphost

> and export it as a new LUN from the HP web interface, it does not
appear

> as  a new disk. If I reboot, I get the LUN to appear as a new
SCSI

> device (sd[a-z]).


> Is there any way I can force automatic detection?
One of the reasons to

> use snapshots is to be able to back up the system without downtime,
so

> not being able to detect the LUNs makes the whole set up a bit pointless.


> I have tried kudzu, the rescan-scsi-bus.sh script
and everything else I

> have found online, with no luck. The LSI tools only seem to be available

> for i386, and I would like to avoid adding the 32bit environment,
if I can.


> Any help would be greatly appreciated.


> Thanks,


> Gabriel Tabares


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Hi,
I do a rescan (online) on multipath with 
echo "- - -" > /sys/class/scsi_host/host0/scan

echo "- - -" > /sys/class/scsi_host/host1/scan

echo "- - -" > /sys/class/scsi_host/host2/scan

echo "- - -" > /sys/class/scsi_host/host3/scan

echo "- - -" > /sys/class/scsi_host/host4/scan

echo "- - -" > /sys/class/scsi_host/host5/scan

echo "- - -" > /sys/class/scsi_host/host6/scan
depends on the amount of controllers.