[CentOS] iSCSI best practices
Digimer
linux at alteeve.comMon Dec 12 19:36:53 UTC 2011
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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 at 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
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