12 Dec
2011
12 Dec
'11
8:36 p.m.
On 12/12/2011 02:02 PM, John R Pierce wrote:
On 12/12/11 10:23 AM, Digimer wrote:
Shared cache is, I think, a single-point-of-failure.
no, its done with replication over a private channel between the storage controllers. standard feature on all redundant controller hardware/appliance storage controllers such as IBM DS series, HP MSA, etc etc.
The same (effective, if not technical) thing can be achieved using two nodes with a dedicated storage link using RAID controllers with battery or flash backed cache.
DRBD will return as soon as the write is committed to the controller's cache instead of the storage proper, so the replication performance should still be very, very fast.
--
Digimer
E-Mail: digimer@alteeve.com
Freenode handle: digimer
Papers and Projects: http://alteeve.com
Node Assassin: http://nodeassassin.org
"omg my singularity battery is dead again.
stupid hawking radiation." - epitron