Date: Fri, 15 Jan 1999 14:08:47 -0500 (EST) From: Joe Gleason <clash@tasam.com> To: freebsd-questions@FreeBSD.ORG Subject: Large block size for very large files Message-ID: <Pine.BSF.3.96.990115140139.7624A-100000@tasam.com>
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I have a backup drive (8gb) and I tar the rest of my system onto that
drive, so the only thing sitting on the backup drive is my 3-4gb tar file.
Would it be wise for me to increse my block size so that this filesystem
would have less overhead that I don't need?
After doing:
newfs -b 65536 -f 8192 /dev/wd2s1e
I got this df output:
/dev/wd2s1e 8139752 8 7488568 0% /mnt/ccd0
After doing:
newfs /dev/wd2s1e
I got this df output:
/dev/wd2s1e 7959084 1 7322357 0% /mnt/ccd0
The one with the 64k block size seems to have more space availble.
When I try to set the block size to be greater than 64k, newfs has issues:
Example:
Trying 128k block size:
root@sh1# newfs -b 131072 -f 16384 /dev/wd2s1e
newfs: /dev/wd2s1e: not a character-special device
Warning: 416 sector(s) in last cylinder unallocated
/dev/wd2s1e: 16408160 sectors in 4006 cylinders of 1 tracks, 4096
sectors
8011.8MB in 251 cyl groups (16 c/g, 32.00MB/g, 1024 i/g)
super-block backups (for fsck -b #) at:
64, 0, 8208, 1612709888, 67174400, 81984, 8388608, 117506048, 268566528,
0,seek error: -2147483648
wtfs: Undefined error: 0
Trying 256k block size:
root@sh1# newfs -b 262144 -f 32768 /dev/wd2s1e
newfs: /dev/wd2s1e: not a character-special device
Warning: 448 sector(s) in last cylinder unallocated
/dev/wd2s1e: 16408128 sectors in 4006 cylinders of 1 tracks, 4096
sectors
8011.8MB in 251 cyl groups (16 c/g, 32.00MB/g, 2048 i/g)
super-block backups (for fsck -b #) at:
Segmentation fault (core dumped)
Feel free to tell me I am completely insane and do not need a >64k block
size.
Joe Gleason
Tasam
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