From: Green, Simon (Simon.Green@EU.ALTRIA.COM)
Date: Thu Mar 06 2003 - 13:37:55 EST
I wasn't suggesting you move /tmp out of rootvg. Rather, add another disk
to rootvg, or break the mirror so that you can use one disk for /tmp and one
for the rest of rootvg. Both disks remain in rootvg. All of this can be
done on-line, using rmlvcopy and - if necessary - migratepv.
You can't change the JFSlog for any of this, though, without booting into
maintenance mode.
Simon Green
Altria ITSC Europe s.a.r.l.
AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
N.B. Unsolicited email from vendors will seldom be appreciated.
> -----Original Message-----
> From: Holger.VanKoll@SWISSCOM.COM [mailto:Holger.VanKoll@SWISSCOM.COM]
> Sent: 06 March 2003 17:48
> To: aix-l@Princeton.EDU
> Subject: Re: 2nd jfslog
>
>
> 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
> > --------------------------------------------------------------
> > ------------------------------------------
> > Bill Verzal
> > Technical Consultant
> > Forbes Technical Consulting
> > (312) 653-3684
> > bill_verzal@bcbsil.com
> > billverzal@imcingular.com (Pager)
> > 888-428-4025 (Pager)
> > MailStop: 27.202B
> >
> >
> >
> >
> > 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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