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Re: ONCONFIG for 9.40 offered for comment

Posted in 2004

Topics: Server Administration

Art S. Kagel — — source: Usenet: comp.databases.informix

On Wed, 16 Jun 2004 13:29:21 -0400, Neil Truby wrote:

↪ replying to Art S. Kagel
Neil Truby — — source: Usenet: comp.databases.informix

"Art S. Kagel" <kagel@bloomberg.net> wrote in message news:pan.2004.06.16.17.04.12.773451.9956@bloomberg.net... > On Wed, 16 Jun 2004 13:29:21 -0400, Neil Truby wrote: > > From these lines I'd say you would be able to utilize NUMAIOVPS set to 10 or > 12. These values indicate that almost 3 out of 4 COOKED IO requests are > waiting for service! > > > aio 0 i 0.2 7041 5390 1429 0 4637 1.5 0 > > aio 1 i 0.1 3379 1901 1478 0 980 3.4 0 > > aio 2 i 0.1 3117 1697 1420 0 866 3.6 0 > > Art S. Kagel With kaio enabled and everything on raw disk (unless we've mis-linked a chunk to a character device by mistake - better check) where would these aio requests be coming from?

↪ replying to Neil Truby
Art S. Kagel — — source: Usenet: comp.databases.informix

On Wed, 16 Jun 2004 18:21:12 -0400, Neil Truby wrote: > "Art S. Kagel" <kagel@bloomberg.net> wrote in message > news:pan.2004.06.16.17.04.12.773451.9956@bloomberg.net... >> On Wed, 16 Jun 2004 13:29:21 -0400, Neil Truby wrote: >> >> From these lines I'd say you would be able to utilize NUMAIOVPS set to 10 > or >> 12. These values indicate that almost 3 out of 4 COOKED IO requests are >> waiting for service! >> >> > aio 0 i 0.2 7041 5390 1429 0 4637 1.5 > 0 >> > aio 1 i 0.1 3379 1901 1478 0 980 3.4 > 0 >> > aio 2 i 0.1 3117 1697 1420 0 866 3.6 > 0 >> >> Art S. Kagel > > With kaio enabled and everything on raw disk (unless we've mis-linked a > chunk to a character device by mistake - better check) where would these aio > requests be coming from? Writes to the console log everytime someone connects or disconnects, writes to the message log when a logical log is changed or backed up or a checkpoint started or completed, or an archive started or completed. Updating of the files in /INFORMIXTMP, IO with the named pipes stored there to support streams connections, updating the ONCONFIG file if auto logs are added, several other minor, COOKED file, IO chores. The thing is that many of them are volume dependent. The busier the system the more of these operations there are. So there can definitely be an impact on overall server performance if these are backed up. Art S. Kagel

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