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тАО10-20-2003 03:20 AM
тАО10-20-2003 03:20 AM
Shared volume group
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тАО10-20-2003 03:24 AM
тАО10-20-2003 03:24 AM
Re: Shared volume group
vgchange -a r vgname
Plus, you can mount read-only also all the logical volume, but every file created after the mount won't be visible untill next mount/remount.
mount -o ro /dev/vgnamr/lvol.... /dir
You can do it, but i do not suggest it.
If, for any reason, one of the executable uses some directory for storing logs/socket/lock or something else, it simply will have a random chaotic behaviuor, difficult to analyze.
Massimo
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тАО10-20-2003 03:28 AM
тАО10-20-2003 03:28 AM
Re: Shared volume group
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тАО10-20-2003 03:29 AM
тАО10-20-2003 03:29 AM
Re: Shared volume group
Without MC/SG to control this scenario, you're risking disaster. It can be done, HP doesn't support it, and you can end up activating the VG with full access from multiple servers. If you're going to attempt this, you have to be extremely careful about running vgchange -a y on one, and only one, server. Believe me, I learned the hard way.
Pete
Pete
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тАО10-20-2003 03:29 AM
тАО10-20-2003 03:29 AM
Re: Shared volume group
One thing we found though, if you create a new file on master server it does not reflect on secondary server till you unmount and mount the shared VG on secondary server
-USA..
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тАО10-20-2003 03:31 AM
тАО10-20-2003 03:31 AM
Re: Shared volume group
Now, if you are willing to unmount all the hosts and mount one read-write to do the updates and then unmount it and finally remount all the hosts read-only then that will work just fine -- and be perfectly safe.
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тАО10-20-2003 03:32 AM
тАО10-20-2003 03:32 AM
Re: Shared volume group
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тАО10-20-2003 03:55 AM
тАО10-20-2003 03:55 AM
Re: Shared volume group
If you have the veritas foundation suite , it comes with a intersting product called as CFS cluster file system which will subsitute for NFS in times to come , you may like to look at the same , and ofcourse you always can activate the shared vg in read only mode .
Manoj Srivastava
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тАО10-20-2003 06:33 AM
тАО10-20-2003 06:33 AM
Re: Shared volume group
Of course, then it would be writable by all... You would have to restrict the filesystem if that would be necessary.
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тАО10-20-2003 06:36 AM
тАО10-20-2003 06:36 AM
Re: Shared volume group
Just load /etc/exports with the hostnames of the remote boxes and then run the NFS mount on the remote box.
then type exportfs at the prompt
mount your.host.com:/my/LVOL /my/mount/point