Question about 2kb filesystems
Dennis Page
denny at mcmi.UUCP
Thu Jan 5 08:50:34 AEST 1989
In article <978 at vsi.COM> friedl at vsi.COM (Stephen J. Friedl) writes:
> A customer of mine has a 3B2/600 running System V Release
>3.2.1, with an Informix-SQL application (ver 2.10.00B). We just
>converted the filesystem with the actual *large* database files
>to be a 2kb filesystem, and the customer notices that everything
>runs slower.
Did you test the rotation gap when you changed logical block sizes? What
is the time difference between moving 1k & 2k blocks? Did they change mkfs
to use *logical* gap size instead of physical (512) gap size?
Did you check to make sure that the data area still begins on a cylinder
boundary? (Twice the logical block size means twice the boundary size for
superblock & inode tables.)
So many questions! :-)
Btw: Be wary of the possibility of mkfs using logical blocks for gapping
and fsck using physical blocks. This nasty screwup, especially if you do
fsck -s by habit. I don't know if AT&T 3.2 has this disease (I really
doubt it -- they don't have it in 3.1.1) , but Unisys 3.x sure does.
--
Good health is merely the slowest rate at which one can die.
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