Am 25.10.2013 um 13:47 schrieb Nux! <nux@xxxxxxxxx>:
> On 25.10.2013 00:12, Lists wrote:
>> On 10/24/2013 03:48 PM, Karanbir Singh wrote:
>>> On 10/23/2013 10:30 AM, Morgan Cox wrote:
>>> has someone quantified what this 'insane' amounts to ?
>>
>> Going from HDD to SSD's gave us better than a 95% reduction in query
>> times for complex queries using PostgreSQL on otherwise identical
>> hardware. I wouldn't have believed it had I not seen it directly, for
>> myself.
>
> That's great, but it's not an answer to what has been asked.
> Have you tried SSD based software raid on stock kernel and on
> kernel-ml, have you noticed any big difference?
>
> I guess there should be some difference, software raid is not capable
> of TRIM in stock kernel, but I'm also not sure if a newer kernel is all
> that's required, perhaps modifications to mdadm tool are also necessary.
saying that - what about general usage of non-stock / higher-version kernels. There
is a non trivial dependence between kernel and userspace tools. Are there really no
pitfalls, running e.g. a kernel 3.11 on EL6 (as stated http://elrepo.org/tiki/kernel-lt)?
Just curious.
--
LF
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