Re: Suggest Hardware Raid Controller Card

[John R Pierce <pierce@xxxxxxxxxxxx>]

On 07/11/11 5:16 PM, Christopher Chan wrote:
> Who needs bbu when you can get an SSD to work with your ext3/ext4 that is
> sitting on an md raid 1/0/nested 1+0/10?

lI hope your SSD isn't write buffering on commits.     many (most?) 
consumer priced SSDs can corrupt file systems badly on power failures 
during active file allocation operations, and drop pending database 
writes on the floor.

If an SSD doesn't do write buffering, its brutally slow relative to its 
read speeds.  Only the more expensive enterprise drives have 'supercap' 
or other power backups for emergency buffer flushing in case of abrupt 
power shutdowns.

-- 
john r pierce                            N 37, W 122
santa cruz ca                         mid-left coast

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