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- From: ben@osiris.usi.utah.edu (Ben Pratt)
- Subject: Re: JFS i-nodes summary
- Message-ID: <1992Aug31.210125.12123@fcom.cc.utah.edu>
- Keywords: jfs i-nodes filsystem
- Sender: news@fcom.cc.utah.edu
- Organization: Utah Supercomputing Institute
- References: <1992Aug28.174656.8854@fcom.cc.utah.edu> <1992Aug31.001843.16315@athena.mit.edu>
- Date: Mon, 31 Aug 92 21:01:25 GMT
- Lines: 33
-
- In article <1992Aug31.001843.16315@athena.mit.edu>
- jfc@athena.mit.edu (John F Carr) writes:
-
- > 55 / 2000 = 2.8%
- >
- > A loss of less than 3% of space merits an "ouch"? If you're normally
- > running at 97% capacity you've got bigger problems than JFS.
- >
- > Have you investigated the performance of JFS as you approach 100% use?
- > You may be better off not using the space. The Berkeley fast file
- > system reserves 10% in addition to the inode space to prevent
- > performance degradation, but I rarely hear any complaints about
- > inefficient use of space.
- >
- > If you can get down to a small number of files of nearly constant size,
- > you should not use JFS and instead use an unformatted disk partition
- > (/dev/something). This will have better performance and allow you to
- > use more space.
- >
- > --
- > John Carr (jfc@athena.mit.edu)
-
- Thanks for the feedback, and the sanity check, John - your points are
- well taken. I can say that in some cases, capacity is more important
- than performance (within reason) and that with 8 machines allocating
- close to half of a gig in unused i-nodes that could otherwise be used
- for datablocks, I don't like to see the unecessary waste. If I want
- to sacrifice a little performance for the capability of writing 50
- more megabytes, why shouldn't I be able to? That aside, I hadn't
- really considered the performance issue and appreciate your pointing
- it out to me,
-
- Ben
-