Re: 20TB Storage System

From: Poul-Henning Kamp (phk_at_phk.freebsd.dk)
Date: 09/03/03

  • Next message: Petri Helenius: "Re: 20TB Storage System" 
    To: Eric Anderson <anderson@centtech.com>
Date: Wed, 03 Sep 2003 22:34:16 +0200

    In message <3F564F70.1000905@centtech.com>, Eric Anderson writes:
    >Poul-Henning Kamp wrote:
    >> In message <3F564DF6.3090200@he.iki.fi>, Petri Helenius writes:
    >>
    >>
    >>>You have any insight into the fsck memory consumption? I remember getting
    >>>myself saved quite a long time ago by reducing the number of inodes.
    >>
    >>
    >> I have not studied it. I always try to avoid having more than an
    >> order of magnitude more inodes than I need, it also saves fsck time.
    >>
    >
    >So what's the appropriate way to calculate what blocksize and how many
    >inodes you should use?

    "Know your data" :-/

    "df -i" will report both block and inode usage for a filesystem.

    You adjust number if inodes by specifying the expected average
    number of bytes per inode (== bytes_used / inodes_used) to newfs.

    block/fragment I have not heuristics for, but I think 32/4 is
    a good alround setting for multi-GB disks. 

    -- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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