Re: problem with squid (fwd)

From: Markus Stumpf <>
Date: Wed, 29 Jul 1998 21:35:05 +0200

On Wed, Jul 29, 1998 at 04:38:17PM +1100, Julie Xu wrote:
> Michael and experts,
> Bad new again, from cache.log I start to get message as below:
> 98/07/29 16:22:06| WARNING: Repeated failures to free up disk space!
> 98/07/29 16:22:06| storeGetSwapSpace: Disk usage is over high water mark
> 98/07/29 16:22:06| --> store_swap_high = 72181 KB
> 98/07/29 16:22:06| --> store_swap_size = 268241 KB
> 98/07/29 16:22:06| --> asking for 0 KB
> this message come out every minutes.
> now the cache is not full
> sp3#df /cache
> Filesystem 512-blocks Free %Used Iused %Iused Mounted on
> sp1:/cache 1458176 727472 51% - - /cache
> What is problem again???

Ok, from the beginning:

squid-1.1.x has a kind of "database" where it stores all the information
about it's objects. This database is kept for one in memory and for
two on disk. The latter is the file "log". When u send a kill -USR1 to
squid, it dumps it's memory database.
While squid is running it appends new fetched objects simply to the end
of "log".
If squid dies without a chance to write the clean "log" file it reads
the "unclean" one and verifies it against the content of the cache
directory(s). This is "slow startup".
If it has a clean log file at startup (in this case it has a file
"log-last-clean") it simply reads the file and no checks against
the cache directories are done.
In both cases it maintains a file "" during startup and when
it is finished it removes the "log" and renames "" to log.

The worst case that can happen to squid-1.1.x is that it loses the
"log" file and has no chance to dump a clean new one.
Then it doesn;t have any information on the content of the cache
directories and all the objects are still there but squid is "blind"
for them. This behaviour is fixed in 1.2.x
In this situation you are probably running into a situation where
your disk is physically full, but squid doesn't "know" about it.
The clean way is to remove all the cache files/directories and
"start over".

The situation you have is very strange.
Did you change something in the squid.conf? Maybe change the user
squid is running under? In this case squid might not be able to
unlink already existing (and outdated) files in the cache.
From the messages you receive I assume the latter in conjunction
with a modification of the squid.conf file giving it less disk space
to use.
Squid does not simply "fill the disk until it's full" but you have
to configure the amount of disk space squid may use.

Hope that helps

Received on Wed Jul 29 1998 - 12:36:27 MDT

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