| From: | Magnus Hagander <magnus(at)hagander(dot)net> |
|---|---|
| To: | Yeb Havinga <yebhavinga(at)gmail(dot)com> |
| Cc: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Intel 710 pgbench write latencies |
| Date: | 2011-11-02 15:06:44 |
| Message-ID: | CABUevExmdcPwY4nw0FZFp2dx8E-rqjHK-eaPvuH47YxGq+Nnvg@mail.gmail.com |
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| Lists: | pgsql-performance |
On Wed, Nov 2, 2011 at 16:04, Yeb Havinga <yebhavinga(at)gmail(dot)com> wrote:
> On 2011-11-02 15:06, Kevin Grittner wrote:
>>
>> Yeb Havinga<yebhavinga(at)gmail(dot)com> wrote:
>>
>>> I'm now contemplating not using the 710 at all. Why should I not
>>> buy two 6Gbps SSDs without supercap (e.g. Intel 510 and OCZ Vertex
>>> 3 Max IOPS) with a IO controller+BBU?
>>
>> Wouldn't the data be subject to loss between the time the IO
>> controller writes to the SSD and the time it makes it from buffers
>> to flash RAM?
>
> Good question. My guess would be no, if the raid controller does
> 'write-throughs' on the attached disks, and the SSD's don't lie about when
> they've written to RAM.
Doesn't most SSDs without supercaps lie about the writes, though?
--
Magnus Hagander
Me: http://www.hagander.net/
Work: http://www.redpill-linpro.com/
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