echo '- - -' > /sys/class/scsi_host/hostX/scan should be enough to discover new Luns. For some unknown reason, with some specific SAN storage arrays (HP XP in my case) , for newly SAN connected servers (new zoning), it is not enough. I have to issue lip (loop init) to my FC hosts echo 1 > /sys/class/fc_host/hostX/issue_lip This lip command can be destructive(and is asynchronous) , so use it only before first SAN discovery. After that as I said, scan is enough. Brem 2010/7/6 Bryn M. Reeves <bmr@xxxxxxxxxx>: > On 07/01/2010 06:43 PM, Allen, Jack wrote: >> That sounds more like what I am looking for. But I can not find the script on my >> system or what provides it via "yum provides". I am running RHEL 5.5. >> We have customers that run an Application that needs to be up 24*7. They some >> times need to add additional storage and when attached to a SAN they would >> prefer not to have to take the Application down and reboot the system just to >> make the new LUNs be seen by the system. >> ----- >> Jack Allen >> >> -------------------------------------------------------------------------------- >> *From:* dm-devel-bounces@xxxxxxxxxx [mailto:dm-devel-bounces@xxxxxxxxxx] *On >> Behalf Of *Oren Held >> *Sent:* Thursday, July 01, 2010 2:55 AM >> *To:* dm-devel@xxxxxxxxxx >> *Subject:* Re: Rescan for new LUNs >> >> It's not an easy process. >> >> The rescan-scsi-bus.sh script was added in recent RHEL5 updates, already in old >> SLES. I guess it's becoming kind of a standard. > > The script was originally written by Kurt Garloff but it's been included > in the sg3_utils tarball for years: > > Changelog for sg3_utils-0.99 [20020317] > ---------------------------- > - add 'fua' and 'sync' arguments to sg_dd, sgp_dd and sgm_dd > - improve sg_inq, add "-cl" and "-36" arguments > - add sg_modes + sg_logs for MODE SENSE and LOG SENSE queries > - add rescan-scsi-bus.sh [Kurt Garloff] to archive director > > It's only recently been included in the build for RHEL packages though > (5.3 iirc) - just yum install sg3_utils to get the script on a RHEL-5 > system (as well as other useful bits like sg_map and friends). > > The script may work for some combinations of storage and controller in > earlier RHEL versions but isn't included in the distribution and is not > always perfectly reliable. > > If you need to add/remove storage on these older releases you can use > the simple scsi-add/remove-single-device interface via /proc/scsi/scsi. > > If you have access to the Red Hat knowledge base (RHN login) there's an > article that explains the options on RHEL systems: > > https://access.redhat.com/kb/docs/DOC-3942 > > And there's the RHEL5 Online Storage Reconfiguration Guide here: > > http://tinyurl.com/ya6wmce [www.redhat.com] > > That documents these interfaces as well as the FC and iSCSI APIs and > their relation to other components such as multipath. > > Regards, > Bryn. > > -- > dm-devel mailing list > dm-devel@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/dm-devel > -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
