Date: Thu, 2 Nov 2000 09:25:40 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Randell Jesup <rjesup@wgate.com> Cc: Marius Bendiksen <mbendiks@eunet.no>, Randell Jesup <rjesup@wgate.com>, arch@FreeBSD.ORG Subject: Re: Like to commit my diskprep Message-ID: <200011021725.eA2HPeM38718@earth.backplane.com> References: <Pine.BSF.4.05.10011021602500.10193-100000@login-1.eunet.no> <200011021632.eA2GWZ138286@earth.backplane.com> <ybupukecnoq.fsf@jesup.eng.tvol.net.jesup.eng.tvol.net>
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: The defaults for -b and -f and -c for newfs/etc are WOEFULLY
:out-of-date. See the sysinstall checkin comment I referenced. I use 16K
:myself. It's possible larger might be better, especially for large
:partitions - perhaps make it variable on partition size.... And 16 for cpg
:is truely criminal (can you say thousands of spare root blocks? And very
:slow newfs?)
:
:--
:Randell Jesup, Worldgate Communications, ex-Scala, ex-Amiga OS team ('88-94)
:rjesup@wgate.com
Not to mention the bytes/inode (-i) If you want fsck to go fast on a
big filesystem, reducing the number of inodes helps a lot. I find myself
using -i 32768 or -i 65536 or even higher numbers on partitions which
hold big database files.
da1s1d:
newfs /dev/da1s1d
mount
df -i
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused
/dev/da1s1d 70491666 2 64852332 0% 1 8962045 0%
time fsck /dev/da1s1d
1 files, 1 used, 35245832 free (16 frags, 4405727 blocks, 0.0% fragmentation)
14.681u 2.100s 1:05.92 25.4% 247+6201k 0+1io 0pf+0w
newfs -i 32768 /dev/da1s1d
mount
df -i
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused
/dev/da1s1d 71331858 2 65625308 0% 1 2240509 0%
time fsck /dev/da1s1d
1 files, 1 used, 35665928 free (16 frags, 4458239 blocks, 0.0% fragmentation)
7.480u 0.693s 0:38.34 21.3% 241+6018k 0+1io 0pf+0w
Combining it with your -c suggestion (my god, the -c default is
ridiculously low! Can we change the default?)
newfs -i 32768 -c 100 /dev/da1s1d
mount
df -i
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused
/dev/da1s1d 71389936 2 65678740 0% 1 2246397 0%
time fsck /dev/da1s1d
1 files, 1 used, 35694967 free (15 frags, 4461869 blocks, 0.0% fragmentation)
7.584u 0.556s 0:18.82 43.1% 248+6172k 0+1io 0pf+0w
^^^^
18 seconds vs 66 seconds in the default case.
-Matt
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