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- Xref: sparky comp.unix.ultrix:8988 comp.unix.misc:4647
- Newsgroups: comp.unix.ultrix,comp.unix.misc
- Path: sparky!uunet!think.com!ames!pacbell.com!rtech!ingres!rog
- From: rog@Ingres.COM (Roger Taranto)
- Subject: Re: Ultrix newfs/mkfs -- can't change number of inodes?!
- Message-ID: <1992Dec20.094432.9276@pony.Ingres.COM>
- Organization: Ingres Corporation, a subsidiary of The ASK Group, Inc.
- References: <BzFv8K.JEJ@mtholyoke.edu>
- Date: 20 Dec 92 09:44:32 GMT
- Lines: 21
-
- We just spent the day playing with mkfs trying to tune our news partitions,
- and have empirically determined many of the defaults.
-
- From the document describing the Berkeley Fast File System, there is a
- hard limit of 2048 inodes per cylinder group.
-
- If the block size is 8192, then the number of cylinders per group must
- be a multiple of 16, and the frag size must be at least 1024.
-
- If the block size is 4096, then the number of cylinders per group must
- be a multiple of 8, and the frag size must be at least 512.
-
- So, if you're at the maximum of 2048 inodes per cylinder group, and the
- number of cylinders per group is 16, then you have to lower the block size
- to 4096 to be able to lower the cylinders per group to 8.
-
- The BSD FFS document also seemed to imply that 4096 and 8192 were the only
- block size choices.
-
- -Roger
- rog@ingres.com
-