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October 29th, 2007 03:00
about mirrorview question
Dear All,
I have established a mirrorview connection from CX3 to CX700 and also allocated write intend log luns on both storages.
There is a 100GB LUN which was synchronized to remote storage.
How much time I have without requiring full sync if I tried to fracture the mirror?
Thanks for any input,
Denns Dai
I have established a mirrorview connection from CX3 to CX700 and also allocated write intend log luns on both storages.
There is a 100GB LUN which was synchronized to remote storage.
How much time I have without requiring full sync if I tried to fracture the mirror?
Thanks for any input,
Denns Dai
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BAP2
12 Posts
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November 12th, 2007 08:00
The amount of synchronization needed is function of how long the mirror is fractured and how much write activity there is. When a mirror is fractured, there is a fracture log bitmap that tracks changed areas of the LUN. Since its a bitmap, it doesn't "fill up", but will just continue to track the changed areas for as long as the mirror is fractured. So it would be possible to in effect have a full synchronization if there is enough write activity during a fracture and that write activity was across all logical block addresses of the LUN.
There is a whitepaper on PowerLink, MirrorView Knowledgebook, that explains the fracture log and write intent log in more detail.
http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/H2251_clariion_mirrorview_asynch_dr_wp_ldv.pdf
Regards,
Bruce