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

Tue May 24 18:09:15 UTC 2011
Steve Clark <sclark at netwolves.com>

On 05/24/2011 02:01 PM, John R Pierce wrote:
> On 05/24/11 10:32 AM, Gordon Messmer wrote:
>> On 05/24/2011 09:57 AM, John R Pierce wrote:
>>>>   also you want SSD that has a supercap on its internal cache so pending
>>>>   writes aren't lost in a power failure scenario.
>> You know, I've asked people about that in the past since the whole block
>> read/erase/write cycle seems like a risk in the event of power loss, but
>> never got any satisfactory answer.  What manufacturers/models offer that
>> feature?  Are most drives with caps clearly labeled?
> I just looked at OCZ's marketing fluff--err--webpile and it appears the
> Vertex EX and PRO drives advertise that they have a supercapacitor.  the
> others I sampled didn't.
> http://www.ocztechnology.com/ocz-vertex-2-pro-series-sata-ii-2-5-ssd.html
> my superficial scan of Intel's webpile didn't turn up any reference to
> them on the x25-e or 510 drives.     ah, the intel 320 series has power
> failure protection which presumably means something like a supercap to
> supply sufficient power to complete any pending write cycles..
> There's an article on anandtech detailing datalosses on many SSDs on
> power failure scenarios.
> (and, please folks, UPS's are great, but they fail too, you can't rely
> on them for data protection).
Thats why you have servers with redundant power supplies with each power supply plugged into a separate ups.

Stephen Clark
Sr. Software Engineer III
Phone: 813-579-3200
Fax: 813-882-0209
Email: steve.clark at netwolves.com
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