Re: hardware upgrade, performance degrade? - Mailing list pgsql-performance

I'd be more interested in the random results from bonnie++ but my real
world experience tells me that for heavily parallel writes etc a
RAID-10 will stomp a RAID-6 or RAID-60 on the same number of drives.

On Mon, Mar 4, 2013 at 4:47 PM, Steven Crandell
<steven.crandell@gmail.com> wrote:
> Mark,
> I ran pg_fsync_test on log and data LV's on both old and new hardware.
>
> New hardware out performed old on every measurable on the log LV
>
> Same for the data LV's except for the 16kB open_sync write where the old
> hardware edged out the new by a hair (18649 vs 17999 ops/sec)
> and write, fsync, close where they were effectively tied.
>
>
>
>
> On Mon, Mar 4, 2013 at 4:17 PM, John Rouillard <rouilj@renesys.com> wrote:
>>
>> On Mon, Mar 04, 2013 at 03:54:40PM -0700, Steven Crandell wrote:
>> > Here's our hardware break down.
>> >
>> > The logvg on the new hardware  is 30MB/s slower (170 MB/s vs 200 MB/s )
>> > than the logvg on the older hardware which was an immediately
>> > interesting
>> > difference but we have yet to be able to create a test scenario that
>> > successfully implicates this slower log speed in our problems. That is
>> > something we are actively working on.
>> >
>> >
>> > Old server hardware:
>> >         Manufacturer: Dell Inc.
>> >         Product Name: PowerEdge R810
>> >         4x Intel(R) Xeon(R) CPU           E7540  @ 2.00GHz
>> >         32x16384 MB 1066 MHz DDR3
>> >         Controller 0: PERC H700 - 2 disk RAID-1 278.88 GB rootvg
>> >         Controller 1: PERC H800 - 18 disk RAID-6 2,178.00 GB datavg, 4
>> > drive RAID-10 272.25 GB logvg, 2 hot spare
>> >         2x 278.88 GB 15K SAS on controller 0
>> >         24x 136.13 GB 15K SAS on controller 1
>> >
>> > New server hardware:
>> >        Manufacturer: Dell Inc.
>> >         Product Name: PowerEdge R820
>> >         4x Intel(R) Xeon(R) CPU E5-4620 0 @ 2.20GHz
>> >         32x32 GB 1333 MHz DDR3
>> >         Controller 0: PERC H710P  - 4 disk RAID-6 557.75 GB rootvg
>> >         Controller 1: PERC H810    - 20 disk RAID-60 4,462.00 GB datavg,
>> > 2
>> > disk RAID-1  278.88 GB logvg, 2 hot spare
>> >         28x278.88 GB 15K SAS drives total.
>>
>> Hmm, you went from a striped (raid 1/0) log volume on the old hardware
>> to a non-striped (raid 1) volume on the new hardware. That could
>> explain the speed drop. Are the disks the same speed for the two
>> systems?
>>
>> --
>>                                 -- rouilj
>>
>> John Rouillard       System Administrator
>> Renesys Corporation  603-244-9084 (cell)  603-643-9300 x 111
>>
>>
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>
>



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