Hi Anuj,

During a situation where you have lost power to your SAN, the cache is written to the first set of disk's (the vault). When the power is returned the cache written to the disk is read, and committed to the correct lun.

Cheers
John

Message was edited by: John to correct atypo or two
Loudenj

Does it mean that the time there is a power loss, cache would immediately get destaged to the vault area? OR the cache and the vault area have same length battery backup and it would get destaged when the baterry backup is also over?

Thanks Ryan

If your batteries are faulted then write cashe will be disabled and all write data will go directly to disk, by passing cache.

how to check that write cache is disabled or not.

In Navisphere, right click on the array icon and select Properties then click on the cache tab - there are three check boxes - two for Read cache and one for Write cache. This is the system cache. Each LUN can also have its read or write cache set individually - again, right click on a LUN and select properties and select the cache tab.

glen

Thanks
Glen