Re: Do I have a hardware or a software problem?

On Dec 12, 2012, at 2:41 AM, Niels Kristian Schjødt <nielskristian(at)autouncle(dot)com> wrote:

> Are you using a hardware based raid controller with them?
>
Yes, of course. Hardware raid with cache and bbu is a must. You can't get fast fsync without it.
Also mdadm is a pain in the ass and is suitable only on amazon and other cloud shit.

> Den 11/12/2012 20.11 skrev "Evgeny Shishkin" <itparanoia(at)gmail(dot)com>:
>
> On Dec 11, 2012, at 10:54 PM, Niels Kristian Schjødt <nielskristian(at)autouncle(dot)com> wrote:
>
>> And what is your experience so far?
>>
> Increased tps by a factor of 10, database no longer a limiting factor of application.
> And it is cheaper than brand rotating drives.
>
>
>> Den 11/12/2012 18.16 skrev "Evgeny Shishkin" <itparanoia(at)gmail(dot)com>:
>>
>> On Dec 11, 2012, at 5:35 PM, Niels Kristian Schjødt <nielskristian(at)autouncle(dot)com> wrote:
>>
>> >
>> > Den 11/12/2012 kl. 14.29 skrev Craig Ringer <craig(at)2ndQuadrant(dot)com>:
>> >
>> >> On 12/11/2012 06:04 PM, Niels Kristian Schjødt wrote:
>> >>>
>> >>> Maybe I should mention, that I never see more than max 5Gb out of my total 32Gb being in use on the server… Can I somehow utilize more of it?
>> >> For an update-mostly workload it probably won't do you tons of good so
>> >> long as all your indexes fit in RAM. You're clearly severely
>> >> bottlenecked on disk I/O not RAM.
>> >>> The SSD's I use a are 240Gb each which will grow too small within a
>> >>> few months - so - how does moving the whole data dir onto four of
>> >>> those in a RAID5 array sound?
>> >>
>> >> Not RAID 5!
>> >>
>> >> Use a RAID10 of four or six SSDs.
>> >>
>> >> --
>> >> Craig Ringer http://www.2ndQuadrant.com/
>> >> PostgreSQL Development, 24x7 Support, Training & Services
>> >>
>> > Hehe got it - did you have a look at the SSD's I am considering building it of? http://ark.intel.com/products/66250/Intel-SSD-520-Series-240GB-2_5in-SATA-6Gbs-25nm-MLC
>> > Are they suitable do you think?
>> >
>>
>> I am not Craig, but i use them in production in raid10 array now.
>>
>> >
>> >
>> > --
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>