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
Due to various third party issues, and the fact PG rules, we're planning
on migrating our deplorable informix db to PG. It is a rather large DB
with a rather high amount of activity (mostly updates). So I'm going to
be aquiring a dual (or quad if they'll give me money) box. (In my testing
my
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
Jeff,
What I'm wondering about is what folks experience with software raid vs
hardware raid on linux is. A friend of mine ran a set of benchmarks at
work and found sw raid was running obscenely faster than the mylex and
(some other brand that isn't 3ware) raids..
Our company has stopped
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
J == Jeff [EMAIL PROTECTED] writes:
J Due to various third party issues, and the fact PG rules, we're planning
J on migrating our deplorable informix db to PG. It is a rather large DB
J with a rather high amount of activity (mostly updates). So I'm going to
If at all possible, batch your
[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
[EMAIL PROTECTED] (Jeff) writes:
On the pro-sw side you have lots of speed and less cost (unfortunately,
there is a pathetic budget so spending $15k on a raid card is out of the
question really).
I have been playing with a Perq3 QC card
http://www.scsi4me.com/?menu=menu_scsipid=143
which
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
My personal experience with RAID cards is that you have to spend money to get good
performance. You need battery backed cache because RAID 5 only works well with write
to cache turned on, and you need a good size cache too. If you don't have it, RAID 5
performance will suck big time. If you
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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