Subject: Re: system looping on I/O
To: None <email@example.com>
From: Wolfgang Rupprecht <wolfgang+gnus20011114T084521@wsrcc.com>
Date: 11/14/2001 08:57:42
firstname.lastname@example.org (Martin J. Laubach) writes:
> | for a long time (since about end of july) my sparc IPX dies under heavy I/O
> | load (such as a sup -o). I/O seems blocked and the disk keep trashing.
> | Anyone else seen this ?
> Yes, I've seen this under /i386 too. No idea what triggers it,
> I did a cvs update remotely, and suddenly the machine was dead.
> Coming home, I found it massaging the disk intensily (and it
> must have done that for hours).
I now see intense thrashing on one UFS filesystem when it fills up
past what df reports as 90% (really 80%). I don't know if this is a
new problem or if there is something special that I just never noticed
about big filesystems.
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/wd1h 59135937 46183628 9995512 82% /w
At a df of 90% a process writing to the FS would hang for 10 seconds
or longer and the average I0 rate as reported by "iostat 1"
approximated an old paper-tty. Making 10% more free space sped things
Wolfgang Rupprecht <email@example.com>
Coming soon: GPS mapping tools for Open Systems. http://www.gnomad-mapping.com/