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@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@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@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_Storag....
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_Storag...
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