UNSOLVED
RAID cache distribution for writes and reads
Hi
Does any of the PERC controller support the distribution of controller cache to be configurable; so that one can set % to write cache % to read cache ? Like how HP Smart Array P800 does.
For example; when I have 512M cache; I would like to use 80% for write cache and 20% for read cache; so that they don't run into each other.
Dev Mgr
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Posted April 12th, 2010 17:00
This isn't an option on the PERC controllers.
Even on the PowerVault MD3000/3000i and Equallogic systems this isn't an option. On the higher end Dell|EMC storage arrays you can indeed play with the cache settings on that level (there's even some QoS stuff you can play with to prevent a slow LUN (e.g. on SATA drives) from taking all the write cache away from the FC drives.