Article View: comp.sys.sun
Article #9664Re: Problems with Fujitsu-M2382K on Xylogic 735 on a 3/280
From: Jeff Smith
Date: Thu, 15 Dec 1988 09:04
Date: Thu, 15 Dec 1988 09:04
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> We recently received a Fujitsu-M2382K on Xylogic 735 and I was trying to
> set it flying on a 3/280 when I ran into problems with insufficient inodes
> in the client root partition...
We received a reply from hotline@sun.com that helped us. We got enough
inodes at the cost of losing about 1% of our data blocks. I've appended
the suggested workaround.
Jeff Smith
Work around:
See the evaluation below. If the user can afford to loose a few
tracks/sectors, he should remake the filesystem with the third
scheme discussed above by reducing the number of cylinders/group.
But now he should make sure that #sector * #tracks should be an
even number.
#/etc/mkfs /dev/rxy0e 94086 67 26 8192 1024 8 10 60 2048 t 0
/dev/rxy0e: 94068 sectors in 54 cylinders of 26 tracks, 67 sectors
48.2Mb in 7 cyl groups (8 c/g, 7.14Mb/g, 2048 i/g)
super-block backups (for fsck -b#) at:
32, 14048, 28064, 42080, 56096, 70112, 84128,
#
Notice that we have lost 1.8MB of data, #sectors=67, #tracks=26
and the total number of sectors = 94068.
Evaluation:
The number of cylinders per group depend indirectly upon
fs_cpc (cylinders per cycle in position table) and cpg has
to be a multiple of cpc. cpc = 16 >> x, where x is the largest
integer such that "track * sector = N * (2**x)", where N is an
integer. In this case "track*sector" is an odd number, and hence
x=0, and hence cpc=16. UFS depends upon the cpc to find out the
rotational position of the sector. This would be a difficult bug
to fix. See above workaround. With that one can reduce the number
of cylinders per group.
Technical Details
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!lll-lcc!ames!mailrus!cornell!uw-beaver!rice!sun-spots-request From: aat@mace.cc.purdue.edu (Jeff Smith) Newsgroups: comp.sys.sun Subject: Re: Problems with Fujitsu-M2382K on Xylogic 735 on a 3/280 Message-ID: <8812050105.AA03739@mace.cc.purdue.edu> Date: 15 Dec 88 09:04:26 GMT Sender: usenet@rice.edu Organization: Rice University, Houston, Texas Lines: 33 Approved: Sun-Spots@rice.edu Original-Date: Sun, 04 Dec 88 20:05:08 -0500 X-Sun-Spots-Digest: Volume 7, Issue 55, message 12 of 14