[CentOS] SSD for Centos SWAP /tmp & /var/ partition

Gordon Messmer yinyang at eburg.com
Tue May 24 06:33:55 UTC 2011

On 05/23/2011 12:24 PM, John R Pierce wrote:
> yes,butt....   SSD has to erase and write a LARGE block all at once, so
> they don't do so well with the sorts of 8k random writes that write
> intensive applications like relational databases commonly perform.

Many SSD are faster at writing even to already used blocks than disk 
drives are.  Still, to stay on topic, the suggestion that I put forth 
was to use the SSD for external journals for ext3 filesystems with 
journal=data.  In that case, the OS should pretty much always be writing 
full blocks to the SSD, so there should be even less concern about small 
random writes.

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