Tuesday, November 15, 2011

NetApp Insights: FlashCache Doesn't Cache Writes

Below: brilliant article on why NetApp designed its cache product to only affect reads.

http://communities.netapp.com/community/netapp-blogs/efficiency/blog/2011/02/08/flash-cache-doesnt-cache-writes--why

Update: Since writes in ONTAP require several reads to accomplish (updating bitmaps, etc), flashcache can speed up writes.  But since that data is often in system memory already, this is complicated and depends on the situation.

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