Having WAL on a separate drive from the database would be something of
a win. I'd buy that 1 disk for OS+WAL and then RAID [something]
across the other two drives for the database would be pretty helpful.
Just my .02,
I did a lot of testing before I deployed our ~50GB postgresql databases
the machine will be dealing with lots of inserts, basically as many as we can
throw at it
If you mean lots of _transactions_ with few inserts per transaction you should get a
RAID controller w/ battery backed write-back
cache. Nothing else will improve your write performance by nearly as
Hi all,
I have some new hardware on the way and would like some advice on how to get
the most out of it..
its a dual xeon 2.4, 4gb ram and 3x identical 15k rpm scsi disks
should i mirror 2 of the disks for postgres data, and use the 3rd disk for the
o/s and the pg logs or raid5 the 3 disks or
The machine is coming from dell, and i have the option of a
PERC 3/SC RAID Controller (32MB)
or software raid.
does anyone have any experience of this controller?
its an additional £345 for this controller, i'd be interested to know what
people think - my other option is to buy the raid
The Dell PERC controllers have a very strong reputation for terrible
performance. If you search the archives of the Dell Linux Power Edge list
(dell.com/linux), you will find many, many people who get better
performance from software RAID, rather than the hw RAID on the PERC.
Having said that,
I would like to point out though on the PERC controllers that are LSI
based ( Megaraid ) there -are- settings that can be changed to fix any
o the performance issues. Check the linux megaraid driver list archives
to see the full description. I've seen it come up many times and
basically all the
[EMAIL PROTECTED] (Thom Dyson) writes:
The Dell PERC controllers have a very strong reputation for terrible
performance. If you search the archives of the Dell Linux Power
Edge list (dell.com/linux), you will find many, many people who get
better performance from software RAID, rather than
On Fri, 2003-09-12 at 12:55, Richard Jones wrote:
The machine is coming from dell, and i have the option of a
PERC 3/SC RAID Controller (32MB)
or software raid.
does anyone have any experience of this controller?
its an additional £345 for this controller, i'd be interested to know what
The dual xeon arrangement is because the machine will also have to do some
collaborative filtering which is very cpu intensive and very disk
un-intensive, after loading the data into ram.
On Friday 12 September 2003 5:49 pm, you wrote:
RIchard,
its a dual xeon 2.4, 4gb ram and 3x identical
RIchard,
its a dual xeon 2.4, 4gb ram and 3x identical 15k rpm scsi disks
should i mirror 2 of the disks for postgres data, and use the 3rd disk for
the
o/s and the pg logs or raid5 the 3 disks or even stripe 2 disks for pg and
use the 3rd for o/s,logs,backups ?
I'd mirror 2. Stripey
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