Am 02.07.2008 um 00:17 schrieb John R Pierce:
Joseph L. Casale wrote:
This is an old way of doing it but it's worked fine for me over the years.
I think the new way is documented here: http://www.linuxjournal.com/article/7321
i've had very good luck with
echo "- - -" > /sys/class/scsi_host/host?/scan
replacing ? with the proper scsi/fiberchannel host channel #
done this on online systems with minimal impact to other in-use drives.
Personally, I find this a very sad state of affairs. Why on earth is there no API to rescan the SCSI-bus (and the fabric)?
There's also Kurt Garloff's rescan-scsi-bus.sh script (haven't used it in a while and not on RHEL5).
FYI: In W2K3, you enlarge the LUN on the SAN, use diskpart.exe to enlarge the volume...and that's it! http://support.microsoft.com/kb/325590/en-us
I can't believe that nobody needs that in Linux-land. If you enlarge the LUN on the SAN for a Linux-volume, you end-up with a 2nd partition behind the first - you'd need to do some nasty, dangerous disklabel-manipulations to fix that. I end-up just adding another LUN and using LVM to piece them together. Of course, having multiple LUNs from a SAN in an LVM makes it next to impossible to create a consistent snapshot (via the SAN's snapshot functionality) in case the SAN (like all HP EVAs, AFAIK) can only do one snapshot of a LUN at exactly the same time. (And lately, we use ZFS and a cheap MSA70 that eliminates most these inconveniences and happens to save a huge amount of money compared to a SAN from HP).
cheers, Rainer