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cool-Wn6_9
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April 27th, 2009 01:00
reserve lun pool
When do we need the reserv lun pool and which mirrorview uses this asyn or sync?
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Posted April 27th, 2009 02:00
The RLP is used for Snapview (snapshotting and cloning) as well as MirrorView/A.298
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Posted April 27th, 2009 11:00
I forgot to mention that RLP luns are required for SAN Copy incremental sessions as well. All the details are well outlined in the following document:
http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/H1585_clariion_resvd_lun_wp_ldf.pdf298
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Posted April 29th, 2009 00:00
There is another thread with about the same question..... and about the same answer too
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RRR
I tried to find the thread, but failed to find it298
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Posted April 29th, 2009 13:00
Are you referring to this one RRR?
http://forums.emc.com/forums/thread.jspa?threadID=116065&tstart=20298
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Posted May 2nd, 2009 06:00
Nope, that's not the one. I know I've been writing about SANcopy somewhere, but I can't find the thread anymore.
brendm
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313 Posts
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Posted April 27th, 2009 11:00
Snapshots perform copy on first write to the RLP as writes are made on the source lun. If writes are received by the snapshot, it writes to the RLP whatever was written on the source lun blocks as well as whatever that host has written to the snapshot (physically requiring twice the space of that write).
MV/A incremental requires RLP luns on both the primary and secondary arrays. On the primary array, it assigns a RLP lun to each mirror relationship. It contains bitmaps to track changes required during the next synchronization. It will also hold data when new writes are coming in during a sync - on the secondary array, the RLP lun stores the data present on the secondary lun before the sync in order to maintain a ¿gold copy¿ (to go back to if the session fails midway through).
I hope that helps to clarify what RRR already answered.