topic Re: slvmvg file in Operating System - HP-UX

slvmvg file

randy lee — Wed, 08 Jan 2003 14:10:11 GMT

Why is the slvvmg device file created in a service guard environment?

Re: slvmvg file

Dietmar Konermann — Wed, 08 Jan 2003 14:25:20 GMT

Hi, Randy!

The cmlvmd needs this device file to initialize the SLVM during cluster start. I.e. the LVM_START_SLVM ioctl() takes the opened file as an argument. /dev/slvmvg usually points to the root VG (64, 0x0).

BTW, vgscan is known to have problems with it. Fixed with recent LVM commands patches.

Best regards...
Dietmar.

Re: slvmvg file

Jean-Louis Phelix — Wed, 08 Jan 2003 14:30:52 GMT

Hi,

It's used only by cmlvmd daemon ... for shared vg and from the documentation :

Cluster Logical Volume Manager Daemon: cmlvmd
This daemon is responsible for keeping track of all the volume group(s) that have been made cluster aware. When a volume group is made
cluster aware, a cluster node can only activate it in exclusive mode. This prevents the volume group from being activated in write mode by more than one node at a time.

Regards.