Storage Foundation for Sybase ASE CE 7.4 Administrator's Guide - Linux

Managing SCSI-3 PR keys in SF Sybase CE cluster

I/O Fencing places the SCSI-3 PR keys on coordinator LUNs. The format of the key follows the naming convention wherein ASCII "A" is prefixed to the LLT ID of the system that is followed by 7 dash characters.

For example:

node 0 uses A-------

node 1 uses B-------

In an SF Sybase CE/SF CFS/SF HA environment, VxVM/CVM registers the keys on data disks, the format of which is ASCII "A" prefixed to the LLT ID of the system followed by the characters "PGRxxxx" where 'xxxx' = i such that the disk group is the ith shared group to be imported.

For example: node 0 uses APGR0001 (for the first imported shared group).

In addition to the registration keys, VCS/CVM also installs a reservation key on the data LUN. There is one reservation key per cluster as only one node can reserve the LUN.

See About SCSI-3 Persistent Reservations.

The following command lists the keys on a data disk group:

# vxdg list |grep data

dbdata_dg enabled,shared,cds 1201715530.28.pushover

Select the data disk belonging to dbdata_dg:

# vxdisk -o alldgs list |grep dbdata_dg

sdh auto:cdsdisk    sdh       sybdata_101  online shared
sdj auto:cdsdisk    sdj       sybdata_101  online shared
sdk auto:cdsdisk    sdk       sybdata_101  online shared

The following command lists the PR keys:

# vxdisk -o listreserve list sdh

........

........

Alternatively, the PR keys can be listed using vxfenadm command:

#echo "/dev/vx/dmp/sdh" > /tmp/disk71

# vxfenadm -s all -f /tmp/disk71

Device Name: /dev/vx/dmp/sdh
Total Number Of Keys: 2
key[0]: 
        Key Value [Numeric Format]:  66,80,71,82,48,48,48,52
        Key Value [Character Format]: BPGR0004
key[1]: 
        Key Value [Numeric Format]:  65,80,71,82,48,48,48,52
        Key Value [Character Format]: APGR0004