On 31/08/2010 11:20, Alexander Dalloz wrote: >> 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 > rescan-scsi-bus.sh from sg3-utils should work. > I am afraid that it doesn't: [root at db02 ~]# cat /proc/partitions major minor #blocks name 104 0 292935982 cciss/c0d0 104 1 265217053 cciss/c0d0p1 104 2 2988090 cciss/c0d0p2 8 0 683593744 sda 8 1 683589816 sda1 8 16 683593744 sdb 8 17 683589816 sdb1 8 32 683593744 sdc 8 33 683589816 sdc1 [root at db02 ~]# rescan-scsi-bus.sh Host adapter 0 (mptsas) found. Scanning SCSI subsystem for new devices Scanning host 0 for SCSI target IDs 0 1 2 3 4 5 6 7, all LUNs Scanning for device 0 0 0 0 ... OLD: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: HP Model: MSA2312sa Rev: M110 Type: Enclosure ANSI SCSI revision: 05 Scanning for device 0 0 0 1 ... OLD: Host: scsi0 Channel: 00 Id: 00 Lun: 01 Vendor: HP Model: MSA2312sa Rev: M110 Type: Direct-Access ANSI SCSI revision: 05 Scanning for device 0 0 0 2 ... OLD: Host: scsi0 Channel: 00 Id: 00 Lun: 02 Vendor: HP Model: MSA2312sa Rev: M110 Type: Direct-Access ANSI SCSI revision: 05 Scanning for device 0 0 1 0 ... OLD: Host: scsi0 Channel: 00 Id: 01 Lun: 00 Vendor: HP Model: MSA2312sa Rev: M110 Type: Enclosure ANSI SCSI revision: 05 Scanning for device 0 0 1 1 ... OLD: Host: scsi0 Channel: 00 Id: 01 Lun: 01 Vendor: HP Model: MSA2312sa Rev: M110 Type: Direct-Access ANSI SCSI revision: 05 0 new device(s) found. 0 device(s) removed. [root at db02 ~]# cat /proc/partitions major minor #blocks name 104 0 292935982 cciss/c0d0 104 1 265217053 cciss/c0d0p1 104 2 2988090 cciss/c0d0p2 8 0 683593744 sda 8 1 683589816 sda1 8 16 683593744 sdb 8 17 683589816 sdb1 8 32 683593744 sdc 8 33 683589816 sdc1 > Please see > http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/html/Online_Storage_Reconfiguration_Guide/scanning_for_new_devices.html. > Tried that (it lists the same command that Andreas mentioned), no luck. We're not using FC, so the second part doesn't work. From there, I went to http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/html/Online_Storage_Reconfiguration_Guide/rescan-scsi-bus.html Where it says : "In order for |rescan-scsi-bus.sh| to work properly, |LUN0| must be the first mapped logical unit. The |rescan-scsi-bus.sh| can only detect the first mapped logical unit if it is |LUN0|. The |rescan-scsi-bus.sh| will not be able to scan any other logical unit unless it detects the first mapped logical unit even if you use the |--nooptscan| option. " So I went to the array interface, deleted the volumes and tried re-creating a new volume with a LUN ID of 0, and I get the following error: "Unable to create volume vd01_v001. LUN zero is reserved as the SCC/SES device on this host. (vd01_v001) - The LUN specified (0) must be in the range of 1 - 511." I can't create a LUN with ID 0, which means that rescan-scsi-bus.sh will not work, as per the above text. Any more suggestions? Thanks Gabriel