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06-30-2008 03:00 AM
06-30-2008 03:00 AM
Serviceguard on raw disksn (without LVM)
HP-UX 11.31, SGeRAC 10g, EMC disk array.
Thanks
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06-30-2008 03:33 AM
06-30-2008 03:33 AM
Re: Serviceguard on raw disksn (without LVM)
However packages may require disk space to facilitate the application. The standard package control function has the capability activate LVM VGs IF you configure them in the script. If you don't use LVM, your application must handle the storage management aspect.
Also, in a 2-node cluster, split-brain arbitration is required in the form of a quorum server (does NOT require LVM), a lock disk (which requires LVM) or Lock LUN.
So to avoid LVM when implemention arbitration, you will need an external quorum server (either HP-UX or linux-based).
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06-30-2008 03:40 AM
06-30-2008 03:40 AM
Re: Serviceguard on raw disksn (without LVM)
To resume: configure SG without any disks in ascii config file (that means cmapplyconf will work without VG in it???), install SGeRAC and configure it.
Am i right?
Thanks for the help in advance.
Tomi
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06-30-2008 04:18 AM
06-30-2008 04:18 AM
Re: Serviceguard on raw disksn (without LVM)
You should use "raw LVs" instead of "raw disks". Setup the VG as normal, and when an application requires a device name for raw disk access, give it /dev/vgNAME/rlvolNUMBER instead of /dev/rdsk/cXtYdZ. For the application viewpoint, it's equivalent to a raw disk... but from the sysadmin viewpoint, it is controlled through LVM, with all the LVM's advantages.
Even without ServiceGuard, using LVM with raw LVs allows you to use the VG and/or LV names to give descriptive "labels" to the raw LVs.
For example, without raw LVs:
/dev/rdsk/c4t2d0 = first data disk,
/dev/rdsk/c4t3d0 = second data disk,
/dev/rdsk/c4t5d0 = first index disk,
/dev/rdsk/c4t6d0 = third data disk
etc...
With raw LVs:
/dev/vgdatabase/rlvDATA1 = first data disk,
/dev/vgdatabase/rlvDATA2 = second data disk,
/dev/vgdatabase/rlvINDX1 = first index disk,
/dev/vgdatabase/rlvDATA3 = third data disk
etc...
MK
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06-30-2008 06:31 PM
06-30-2008 06:31 PM
Re: Serviceguard on raw disksn (without LVM)
This is meant for clusters that use vxvm and no LVM for any disks. The locklun can be a partition on a IA disk or a small lun from a disk array.
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07-01-2008 08:46 AM
07-01-2008 08:46 AM
Re: Serviceguard on raw disksn (without LVM)
If you prefer LVM, you can permit Serviceguard to designate a cluster-oriented volume group for raw storage as a lock device also, or you may configure a quorum server or LockLUN (A.11.18).
Build the volume groups first, and import them into the second/other nodes.
With LVM-based VGs, the cluster configuration ASCII file must list the VGs using the parameter OPS_VOLUME_GROUP.
The package control scripts should only list the VG names, and not any mount points of any volume groups marked for 'shared' activation.
This information is discussed in detail in the document titled, "Using Serviceguard Extension for RAC", located at http://docs.hp.com/en/ha.html