[CentOS] write-back cache question
James Chase
james at wintercastle.net
Thu Feb 17 21:48:09 UTC 2011
> You can verify your cache policy with MegaCLI tool. Check your output
> from `MegaCli -CfgDsply -a0' command.
>
What a cool tool. It looks like it should be active according to
MegaCli, though strange that Scott sees his drives in write-back mode
via CentOS and I do not and I also have these horrific NFS speeds via
VMWare that so many people have found to be caused by write-back not
being active...
I don't know what the answer is to this question. I went with iSCSI
instead of NFS, the benefits being that it trounces my NFS setup
performance wise, and seems stable despite warnings of high I/O causing
VMWare to drop the LUN (I tested with bonnie++ as it seems this is an
effective tool in getting the LUN to drop in VMWare).
Product Name: PERC 5/i Integrated
Memory: 256MB
BBU: Present
...
Default Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU
Current Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU
Access Policy: Read/Write
Disk Cache Policy: Disk's Default
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