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04-30-2004 03:15 AM
04-30-2004 03:15 AM
Split a mirror to mount it on other system
I have a VG with mirrored SAN LUN. I want to split the mirror and mount the backup copy on another system. I want to maintain the data on the split copy so as to be used on the other system. By the way mirroring is done across two EVAs. And this split will be permanent â means I will keep this copy to be part of the second system? Hope itâ s clear.
What are steps to achieve such activity?
Appreciate your he
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04-30-2004 03:23 AM
04-30-2004 03:23 AM
Re: Split a mirror to mount it on other system
Once you split the mirror, the data stops updating, so the second system will not have any changes made to the data by the first.
You may wish to have the logical volume shared and mounted from both systems. That could cause data problems.
Once split, data is no longer updated on the split logical volume.
>>>
this split will be permanent
<<<
So how is the second system going to get current data? It can be done, but the objective needs to be clarified.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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04-30-2004 03:30 AM
04-30-2004 03:30 AM
Re: Split a mirror to mount it on other system
Is your SAN EMC?
Then it can be accomplished with BCV's....(I believe HP/Hitachi call it Business Copy?).
Rgds...Geoff
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04-30-2004 03:45 AM
04-30-2004 03:45 AM
Re: Split a mirror to mount it on other system
HP's version is Business copy:
http://www.hp.com/products1/storage/products/disk_arrays/xpstoragesw/business/index.html
We use it for database backups. A script that puts the database in hotbackup mode. Splits the mirror off and mounts it on another server. Once the backup is finished it resysncs the BC back on the original server. Something to that effect.
Works great. I've also used BCV's for EMC storage, and it works pretty much the same way.
Dave
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04-30-2004 03:52 AM
04-30-2004 03:52 AM
Re: Split a mirror to mount it on other system
The first system will be production so I want to have a clear split.
The second system will be development â so no need for the date to be updated after the split.
Itâ s EVA3000
After the split I will still have Raid 1 on the EVA for each copy of the date. Means I will not be merging split back again.
The purpose of the mount on the second system is to have a copy of the data for the development sever before go li
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04-30-2004 03:58 AM
04-30-2004 03:58 AM
Re: Split a mirror to mount it on other system
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04-30-2004 04:04 AM
04-30-2004 04:04 AM
Re: Split a mirror to mount it on other system
The only thing comes to mind is, if your application is a database, updating these disks, the most sound advice is to shut down the database prior to split, so that you will have consistent records.
If not a database, it all depends how your application writes to the disk. As a rule of thumb, I would shut down any application prior to the split of the secondary copy regardless of the app. type.
UNIX because I majored in cryptology...
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04-30-2004 04:13 AM
04-30-2004 04:13 AM
Re: Split a mirror to mount it on other system
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04-30-2004 04:34 AM
04-30-2004 04:34 AM
Re: Split a mirror to mount it on other system
As I am not familiar with EVA arras, I am not much of a help as the device specific command syntax of these units. I am sure there are people around here using these storage arrays who can pitch in shortly.
if the secondary eva unit was attached to the first one as plain mirror disk devices using MirrorUX software, all you need to do is (after shutting down your dB and/or app. of course) :
(assume variable mirror_copies variable contains your current # of mirror copies;
and if this is your case, current value of mirror copies should be 2. It can be checked by running lvdisplay /dev/vg03/lvol_X_ where _X_ should be substituted for 1, 2 or 3 and look for Mirror Copies line)
let new_mirr_count=$mirror_copies-1
lvreduce -M $new_mirr_count /dev/vg03/lvol1 /dev/dsk/c#t#d#
where c#t#d# is the device path on your secondary EVA unit.
repeat the same for lvol2 and lvol3
UNIX because I majored in cryptology...
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04-30-2004 04:36 AM
04-30-2004 04:36 AM
Re: Split a mirror to mount it on other system
UNIX because I majored in cryptology...