AIX

Hello,

I have the following problem:
My HACMP is configured to use certain disk name (hdisk12) for heartbeat function, it uses name, not PVID for that. And now after some reconfiguration my heartbeat disk changed it's name - now it's hdisk11, and hdisk12 is taken by another disk.
I assume that switching disk names is mutch more easier task than changing HACMP config (I'm not very good in HACMP).
How to switch names of two certain disks ?

please help!

thank you in advance
Vilius

Changing hdisk device names is tedious. I'd reconfigure disk heartbeat devices.

If you want to change hdisk names you need to rmdev -dl them. You could use dummy disks to keep cfgmgr from taking certain hdisk names (hdisk12) and then delete the dummy and the former hdisk12 to make it become hdisk12 after another rmdev command. If you delete all of the hdisk devices cfgmgr should be forced to detect devices in a serial way but not in parallel (-S option) but even then the row in which the disks are being detected might be different if signal runtime is influenced by your FC network (especially if your storage is located in different data centers).

Either way you can damage your cluster.... which HACMP version do you use?

I also thought something about adding pseudo hdisk.
How to create dummy hdisk ?
And I can always create some dummy disk using static command or it depends on harware config ?

thanks
Vilius

Depends on the type of disk controller your server has (i.e. the hdisks intended parent). You could use SMIT
# smit makdsk
or the commandline. To give an example for a scsi disk controller:

Code:

(0)aserver:/ 9# lsdev | grep scsi
iscsi0      Available              iSCSI Protocol Device
scsi0       Available 10-80        Wide/Fast-20 SCSI I/O Controller
(0)aserver:/ 10# mkdev -d -cdisk -t1100mb -sscsi -pscsi0 -w0,40
hdisk18 Defined
(0)aserver:/ 11# lscfg -vl hdisk18
  hdisk18          P1/Z1-A0.32  1.1 GB SCSI Disk Drive
(0)aserver:/ 12#