Re: Hardware spec
От | Willo van der Merwe |
---|---|
Тема | Re: Hardware spec |
Дата | |
Msg-id | 46DFE674.6060702@mirasol.co.za обсуждение исходный текст |
Ответ на | Re: Hardware spec (Jean-David Beyer <jeandavid8@verizon.net>) |
Ответы |
Re: Hardware spec
(Florian Weimer <fweimer@bfk.de>)
|
Список | pgsql-performance |
Jean-David Beyer wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Willo van der Merwe wrote: > >> Richard Huxton wrote: >> >>> Willo van der Merwe wrote: >>> >>>> Hi guys, >>>> >>>> I'm have the rare opportunity to spec the hardware for a new database >>>> server. It's going to replace an older one, driving a social >>>> networking web application. The current server (a quad opteron with >>>> 4Gb of RAM and 80Gb fast SCSI RAID10) is coping with an average load >>>> of ranging between 1.5 and 3.5. >>>> >>>> The new machine spec I have so far: >>>> >>> What's the limiting factor on your current machine - disk, memory, >>> cpup? >>> >> I'm a bit embarrassed to admit that I'm not sure. The reason we're >> changing machines is that we might be changing ISPs and we're renting / >> leasing the machines from the ISP. >> >> > Before you get rid of the current ISP, better examine what is going on with > the present setup. It would be good to know if you are memory, processor, or > IO limited. That way you could increase what needs to be increased, and not > waste money where the bottleneck is not. > Good advice. After running a vmstat and iostat, it is clear, to my mind anyway, that the most likely bottleneck is IO, next is probably some more RAM. Here's the output: procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 29688 80908 128308 3315792 0 0 8 63 6 8 17 2 80 1 avg-cpu: %user %nice %sys %iowait %idle 17.18 0.00 1.93 0.81 80.08 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 14.57 66.48 506.45 58557617 446072213 sda1 0.60 0.27 4.70 235122 4136128 sda2 0.38 0.77 2.27 678754 2002576 sda3 2.37 0.49 18.61 429171 16389960 sda4 0.00 0.00 0.00 2 0 sda5 0.71 0.66 5.46 578307 4807087 sda6 0.03 0.01 0.24 6300 214196 sda7 0.02 0.00 0.19 2622 165992 sda8 60.19 64.29 474.98 56626211 418356226
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