topic who know how to active sharable vg on two nodes without install cluster on hpux 11i in Operating System - HP-UX

who know how to active sharable vg on two nodes without install cluster on hpux 11i

hongjing_zhang — Tue, 18 May 2004 05:07:25 GMT

and who have the documents about install oracle 10g rac on hpux 11i,

Re: who know how to active sharable vg on two nodes without install cluster on hpux 11i

Mark Grant — Tue, 18 May 2004 05:49:10 GMT

As far as I am aware, you can't. The "-s" option to "vgchange" only arrives with the arrival of ServiceGuard.

However, it doesn't actually need to be sharable for some kind of failover. The vgexport and vgimport still work. So you could create a volume group on a server, "vgexport -p" it and then import it on the second server. If you then make sure that it is not activated on the second server (by not having an entry in /etc/lvmtab) then you have some means to fail over. I.E when the first server isn't available, just activate it on the second one. I imagine this would all work.

Re: who know how to active sharable vg on two nodes without install cluster on hpux 11i

Ashwani Kashyap — Mon, 16 Sep 2024 09:18:59 GMT

As far as I know its not possible . Even with service Guard cluster , even though the VG's are shared but it is active exclusively on one node only .

For true share , one has to use SLVM ( shared LVM ) that comes with OPS clusters or Service Guard extensions for RAC .

This feature migt also be available in near future when HP completes prting tru cluster from tru64 into HPUX .

Re: who know how to active sharable vg on two nodes without install cluster on hpux 11i

Kent Ostby — Tue, 18 May 2004 06:04:34 GMT

As a further note to those above, the OPS RAC (which is probably what you are looking for) only allows for shared VGs that are used in raw mode.

Shared filesystems except via NFS.

Also, keep in mind that if you use Mark's solution to vgimport/vgexport, the disks when not in use by the one system will look available via SAM and other tools (since they are physically attached but not used on that system) -- be careful not to overwrite the data on those disks from the "other" system where they are not in use.

Best regards,

Kent M. Ostby

Re: who know how to active sharable vg on two nodes without install cluster on hpux 11i

Thayanidhi — Tue, 18 May 2004 07:18:34 GMT

Without MCSG you cannot share the VG.
cmlvmd- monitors the activation of a VG
across the nodes. Without cmlvmd running
you cannot run vgchange -s y.
If you activate the VG is both nodes
without MCSG & vgchange -s y,
you would possibly endup with currupt file
system.

TT

Re: who know how to active sharable vg on two nodes without install cluster on hpux 11i

Geoff Wild — Tue, 18 May 2004 08:30:26 GMT

You need MC/SG (or another clustering software) to share a VG....

Rgds...Geoff

Re: who know how to active sharable vg on two nodes without install cluster on hpux 11i

David Child_1 — Tue, 18 May 2004 08:49:21 GMT

If you are decide to use Marks method (which does work) you will want to edit the /etc/lvmrc file as if MC/SG was installed. You will need to *ensure* that these volume groups don't get activated on the 'standby' host until you want them to.

If you have imported these volume groups on the secondary host, but don't activate them, there is still a risk in the event of a reboot. If the secondary host reboots and you have not modified the /etc/lvmrc file to not activate these 'shared volume groups' they will be activated on reboot.

David

Re: who know how to active sharable vg on two nodes without install cluster on hpux 11i

JW_8 — Fri, 21 May 2004 23:09:51 GMT

Hi,
You must have SG and SGeRAC installed to get
shared VG (SLVM) capability. As for Oracle 10g RAC documentation, you can get it from http://otn.oracle.com. You should have SG/SGeRAC installed and configured before you start the 10g RAC installation. However, this is first release that Oracle introduces CRS. I have heard there are many quality issues. Good luck.