Re: JFS2 - good or bad?

From: Bill Verzal (BVerzal_at_KOMATSUNA.COM)
Date: 07/12/04

  • Next message: John Jolet: "Re: JFS2 - good or bad?" 
    Date:         Mon, 12 Jul 2004 11:04:15 -0500
To: aix-l@Princeton.EDU

    I do play with nbpi on my filesystems. I have some at 32k.

    BV
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    Bill Verzal
    Project Leader, Komatsu America

    (847) 970-3726 - direct
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                 "Green, Simon"
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                                           Re: JFS2 - good or bad?

                 07/12/2004 10:46
                 AM

                 Please respond to
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    You can get the same effect by specifying a higher nbpi. We usually use
    16384, which gives you 1% used on an empty filesystem, so I don't see that
    as a major advantage, although I'll concede it's a better solution in
    theory. For filesystems where the number of inodes used is very high, I
    can
    see that JFS2 would be useful. (I've had a couple of systems where /var
    has
    become unusable because %inode used reached 100%, whilst the actual space
    was scarcely 50% used.)

    INLINE jfs2 logs I can see as being interesting: removes a point of
    contention. However, does it not increase disk head movement? On some
    systems, I've got multiple jfslogs specifically allocated on different
    disks
    to the filesystems that they server - and preferably on low-activity disks.
    Use of inline logs would prevent that and would surely mean that every time
    the filesystem was updated you've got to go to the part of the filesystem
    which has the log, then back for the next update, back to the log etc. 

    --
Simon Green
Altria ITSC Europe Ltd
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> -----Original Message-----
> From: Mills, John T (9814) [mailto:John.T.Mills@ERAC.COM]
> Sent: 12 July 2004 15:28
> To: aix-l@Princeton.EDU
> Subject: Re: JFS2 - good or bad?
>
>
> I'd do it for one reason.  When I make a 1/2 TB filesystem it
> registers as 1% full instead of 4%.  Also the INLINE jfs2
> logs have good potential.
  • Next message: John Jolet: "Re: JFS2 - good or bad?"

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