Joshua Baker-LePain wrote:
On Thu, 12 Oct 2006 at 4:22pm, Bowie Bailey wrote
I have two identical servers. The only difference is that the first one has Maxtor 250G drives and the second one has Seagate 320G drives.
OS: CentOS-4.4 (fully patched) CPU: dual Opteron 280 Memory: 16GB Raid card: 3ware 9550Sx-8LP Raid volume: 4-disk Raid 5 with NCQ and Write Cache enabled
On the first server I have decent performance. Nothing spectacular, but good enough. The second one has about 1/3 the write speed. I can't find any difference between the systems. Both of them have the same stripe size, both have ext3 filesystems, both have write caching and NCQ turned on. I have already increased the read ahead setting to 16384 on both servers.
Turn off NCQ. Last I knew, this was still 3ware's recommendation.
I can try that, but when I tested on the first server, I found that disabling NCQ increased the read performance by 10M/s and decreased the write performance by 10M/s. Maybe I'll get different results from the Seagate drives.
Bowie Bailey wrote:
Joshua Baker-LePain wrote:
On Thu, 12 Oct 2006 at 4:22pm, Bowie Bailey wrote
I have two identical servers. The only difference is that the first one has Maxtor 250G drives and the second one has Seagate 320G drives.
OS: CentOS-4.4 (fully patched) CPU: dual Opteron 280 Memory: 16GB Raid card: 3ware 9550Sx-8LP Raid volume: 4-disk Raid 5 with NCQ and Write Cache enabled
On the first server I have decent performance. Nothing spectacular, but good enough. The second one has about 1/3 the write speed. I can't find any difference between the systems. Both of them have the same stripe size, both have ext3 filesystems, both have write caching and NCQ turned on. I have already increased the read ahead setting to 16384 on both servers.
Turn off NCQ. Last I knew, this was still 3ware's recommendation.
I can try that, but when I tested on the first server, I found that disabling NCQ increased the read performance by 10M/s and decreased the write performance by 10M/s. Maybe I'll get different results from the Seagate drives.
Here's what I'm getting from a dual Opteron 275 box, Centos 4.4-64bit, 2gb RAM and an 8 drive array of 750gig Seagates:
Version 1.03 ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP localhost.locald 4G 248901 96 138957 40 308874 42 625.8
I've been applying all the various tricks that came up during the last couple of threads. Turning NCQ off definitely made a big difference for me.
Cheers,
chrism@imntv.com wrote:
I've been applying all the various tricks that came up during the last couple of threads. Turning NCQ off definitely made a big difference for me.
how about doing a consolidated wiki page on these tricks and tips ? I am sure that will be much appreciated.
Karanbir Singh wrote:
chrism@imntv.com wrote:
I've been applying all the various tricks that came up during the last couple of threads. Turning NCQ off definitely made a big difference for me.
how about doing a consolidated wiki page on these tricks and tips ? I am sure that will be much appreciated.
If time permits, sure. Where?
Cheers,
On Sun, 15 Oct 2006, chrism@imntv.com wrote:
Karanbir Singh wrote:
chrism@imntv.com wrote:
I've been applying all the various tricks that came up during the last couple of threads. Turning NCQ off definitely made a big difference for me.
how about doing a consolidated wiki page on these tricks and tips ? I am sure that will be much appreciated.
If time permits, sure. Where?
Cheers,
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
wikipedia.org?
Justin Piszcz wrote:
wikipedia.org?
whats wrong with wiki.centos.org ?
Nothing, was just a suggestion..
On Mon, 16 Oct 2006, Karanbir Singh wrote:
Justin Piszcz wrote:
wikipedia.org?
whats wrong with wiki.centos.org ?
-- Karanbir Singh : http://www.karan.org/ : 2522219@icq _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
chrism@imntv.com wrote:
Karanbir Singh wrote:
chrism@imntv.com wrote:
I've been applying all the various tricks that came up during the last couple of threads. Turning NCQ off definitely made a big difference for me.
how about doing a consolidated wiki page on these tricks and tips ? I am sure that will be much appreciated.
If time permits, sure. Where?
dude, we've been making lots of noise about wiki.centos.org lately! thats where!!!
- KB
Karanbir Singh wrote:
chrism@imntv.com wrote:
Karanbir Singh wrote:
chrism@imntv.com wrote:
I've been applying all the various tricks that came up during the last couple of threads. Turning NCQ off definitely made a big difference for me.
how about doing a consolidated wiki page on these tricks and tips ? I am sure that will be much appreciated.
If time permits, sure. Where?
dude, we've been making lots of noise about wiki.centos.org lately! thats where!!!
Dude, I've been racking up crazy air miles and working my arse off. Kindly pardon my lack of "focus" on CentOS. :/
Cheers,
On Sun, 2006-10-15 at 21:26 -0400, chrism@imntv.com wrote:
Karanbir Singh wrote:
chrism@imntv.com wrote:
Karanbir Singh wrote:
chrism@imntv.com wrote:
<snip>
If time permits, sure. Where?
dude, we've been making lots of noise about wiki.centos.org lately! thats where!!!
Dude, I've been racking up crazy air miles and working my arse off. Kindly pardon my lack of "focus" on CentOS. :/
Don't worry, the full impact of Galileo's work will hit home here in the near future. :=))
Cheers,
<snip>
-- Bill
chrism@imntv.com wrote:
dude, we've been making lots of noise about wiki.centos.org lately! thats where!!!
Dude, I've been racking up crazy air miles and working my arse off. Kindly pardon my lack of "focus" on CentOS. :/
dude, you gota get a better lens, get your focus sorted out.
Karanbir Singh schrieb:
how about doing a consolidated wiki page on these tricks and tips ? I am sure that will be much appreciated.
Good idea - we should use it more as quite a few tips from this list are very useful. I'd suggest creating http://wiki.centos.org/TipsAndTricks/3w-9xxx So all types of 9xxx series will be covered. As tuning always heavily concerns the driver, this might be the best generalization. If somebody wants to write something about another 3w series, this should IMHO be handled on another page.
Regards, Michael
Michael Kress wrote:
Karanbir Singh schrieb:
how about doing a consolidated wiki page on these tricks and tips ? I am sure that will be much appreciated.
Good idea - we should use it more as quite a few tips from this list are very useful. I'd suggest creating http://wiki.centos.org/TipsAndTricks/3w-9xxx So all types of 9xxx series will be covered. As tuning always heavily concerns the driver, this might be the best generalization. If somebody wants to write something about another 3w series, this should IMHO be handled on another page.
I'd prefer to see it under the Hardware/ namespace - but this discussion can be had on the centos-docs lists ( where i am cross posting to, )
- KB
-
Bowie Bailey -
chrism＠imntv.com -
Justin Piszcz -
Karanbir Singh -
Michael Kress -
William L. Maltby