cost.
Ron
-Original Message-
From: PFC [EMAIL PROTECTED]
Sent: Sep 24, 2005 12:27 PM
Subject: Re: [PERFORM] Advice on RAID card
It looks like a rebranded low end Adaptec 64MB PCI-X - SATA RAID card.
Looks like the 64MB buffer is not upgradable.
Looks like it's SATA, not SATA II
I would consider Software Raid
PFC wrote:
Hello fellow Postgresql'ers.
I've been stumbled on this RAID card which looks nice. It is a
PCI-X SATA Raid card with 6 channels, and does RAID 0,1,5,10,50.
It is a HP card with an Adaptec chip on it, and 64 MB cache.
HP Part #
I would think software raid would be quite inappropriate considering
postgres when it is working is taking a fair amount of CPU as would
software RAID. Does anyone know if this is really the case ?
Dave
On 25-Sep-05, at 6:17 AM, Michael Ben-Nes wrote:
I would consider Software Raid
PFC
On 9/25/05, Dave Cramer [EMAIL PROTECTED] wrote:
I would think software raid would be quite inappropriate considering
postgres when it is working is taking a fair amount of CPU as would
software RAID. Does anyone know if this is really the case ?
I attempted to get some extra speed out of my
On Sun, Sep 25, 2005 at 10:57:56AM -0400, Dave Cramer wrote:
I would think software raid would be quite inappropriate considering
postgres when it is working is taking a fair amount of CPU as would
software RAID. Does anyone know if this is really the case ?
It's not. Modern cpu's can
Dave Cramer wrote:
I would think software raid would be quite inappropriate considering
postgres when it is working is taking a fair amount of CPU as would
software RAID. Does anyone know if this is really the case ?
The common explanation is that CPUs are so fast now that it doesn't make
The common explanation is that CPUs are so fast now that it doesn't make
a difference.
From my experience software raid works very, very well. However I have
never put
software raid on anything that is very heavily loaded.
Even for RAID5 ? it uses a bit more CPU for the parity
PFC [EMAIL PROTECTED] writes:
Which makes me think that I will use Software Raid 5 and convert the
price of the card into RAM.
This should be nice for a budget server.
Gonna investigate now if Linux software RAID5 is rugged enough. Can
always buy the a card later if not.
Even for RAID5 ? it uses a bit more CPU for the parity calculations.
I honestly can't speak to RAID 5. I don't (and won't) use it. RAID 5 is
a little brutal when under
heavy write load. I use either 1, or 10.
Yes, for RAID5 software RAID is better than HW RAID today - the modern general
On Sun, Sep 25, 2005 at 01:41:06PM -0400, Greg Stark wrote:
Also, Raid 5 is particularly inappropriate for write-heavy Database traffic.
Raid 5 actually hurts write latency dramatically and Databases are very
sensitive to latency.
Software raid 5 actually may have an advantage here. The main
On Sun, Sep 25, 2005 at 06:53:57PM +0200, PFC wrote:
Gonna investigate now if Linux software RAID5 is rugged enough. Can
always buy the a card later if not.
Note that 2.6.13 and 2.6.14 have several improvements to the software RAID
code, some with regard to ruggedness. You might want to
[EMAIL PROTECTED] (Joshua D. Drake) writes:
There is a huge advantage to software raid on all kinds of
levels. If you have the CPU then I suggest it. However you will
never get the performance out of software raid on the high level
(think 1 gig of cache) that you would on a software raid
Hello fellow Postgresql'ers.
I've been stumbled on this RAID card which looks nice. It is a PCI-X SATA
Raid card with 6 channels, and does RAID 0,1,5,10,50.
It is a HP card with an Adaptec chip on it, and 64 MB cache.
HP Part # : 372953-B21
Adaptec Part # :
-
From: PFC [EMAIL PROTECTED]
Sent: Sep 24, 2005 4:34 AM
To: pgsql-performance@postgresql.org
Subject: [PERFORM] Advice on RAID card
Hello fellow Postgresql'ers.
I've been stumbled on this RAID card which looks nice. It is a PCI-X
SATA
Raid card with 6 channels, and does
It looks like a rebranded low end Adaptec 64MB PCI-X - SATA RAID card.
Looks like the 64MB buffer is not upgradable.
Looks like it's SATA, not SATA II
Yeah, that's exactly what it is. I can get one for 150 Euro, the Areca is
at least 600. This is for a budget server so while it would be
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