On 2/14/2011 10:37 PM, Erik Trimble wrote:
That said, given that SAN NVRAM caches are true write caches (and not a ZIL-like thing), it should be relatively simple to swamp one with write requests (most SANs have little more than 1GB of cache), at which point, the SAN will be blocking on flushing its cache to disk.
Actually, most array controllers now have 10s if not 100s of GB of cache. The 6780 has 32GB, DMX-4 has - if I remember correctly - 256. The latest HDS box is probably close if not more.
Of course you still have to flush to disk and the cache flush algorithms of the boxes themselves come into play but 1GB was a long time ago.
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