From: Holger.VanKoll@SWISSCOM.COM
Date: Thu Mar 06 2003 - 12:47:57 EST
I already thought about moving /tmp (even thought about using a ramdisk), but ibm docs clearly say this isnt allowed (also for /usr /var hd8 etc.). Probably its needed in early stages of boot where ext. disks are not available yet.
I could, however, mv /tmp /tmp2 && ln -s /fs/on/ext./disk /tmp
Already opened files on /tmp will stay opened/read+writeable and new files will go to the better performing disk.
I think I will give this a try.
-----Original Message-----
From: Green, Simon [mailto:Simon.Green@EU.ALTRIA.COM]
Sent: Thursday, March 06, 2003 6:05 PM
To: aix-l@Princeton.EDU
Subject: Re: 2nd jfslog
Agreed.
Creating another JFSlog won't change the total amount of I/O done to JFSlogs.
The only advantage would be if you created a separate JFSlog just for /tmp, then the performance of other filesystems - remaining on hd8 - might improve. Against that, you may suffer more disk head movement.
The best solution would be to move /tmp onto another disk, away from hd8; possibly with its own JFSlog there.
If this is a temporary situation you might consider breaking the mirror, so that you can have most of rootvg on hdisk0 but /tmp on hdisk1.
> -----Original Message-----
> From: Bill Verzal [mailto:Bill_Verzal@BCBSIL.COM]
> Sent: 06 March 2003 16:23
> To: aix-l@Princeton.EDU
> Subject: Re: 2nd jfslog
>
>
> Are you getting erro log entries of JFSLOG overrun ? If not, I'd say
> not to worry.
>
> bV
> --------------------------------------------------------------
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> Bill Verzal
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> Holger.VanKoll@SWISSCOM.COM
> Sent by: "IBM AIX Discussion List" <aix-l@Princeton.EDU> 03/06/2003
> 10:12 AM Please respond to "IBM AIX Discussion List"
>
>
> To: aix-l@Princeton.EDU
> cc:
> Subject: 2nd jfslog
>
>
> Hello,
> on a 4.3.3-10 system hd8 is constantly overloaded because applications
> write many files to /tmp. rootvg consists of hdisk0 and hdisk1 , lvm
> mirrored, old slow disks. Could I reduce the load on hdisk0/1 if I
> create a 2nd jfslog on these drives?
> IŽd say this will make things worse more probably than
> better, but would
> like to hear your opinion.
> Regards,
> Holger
>
> util #rblk #wblk KB/s volume description
> 0.94 0 1816 136.6 /dev/hd8 jfslog
> 0.79 0 2560 192.5 /dev/hd3 /tmp
> util #rblk #wblk KB/s volume description
> --------------------------------------------------------------
> ----------
> 0.97 736 4552 397.7 /dev/hdisk0 N/A
> 0.90 928 4544 411.6 /dev/hdisk1 N/A
>
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