Re: [squid-users] "Filemap bits in use" with squidclient mgr:storedir

On 17/05/11 21:34, Tom Tux wrote:
> Actual, I have 69% free storedir-capacity (62GB)
> The filemap shows:
> Filemap bits in use: 1805414 of 2097152 (86%)
>
> Is there a way to increase the file filemap-max-value to go around the
> purging-steps? Is it depending on the numbers of
> cache_dir-subdirectories?

This is about absolute cache file count not disk bytes. There is no way
to increase that filemap. UFS in Squid has an absolute 32-bit number
used to index each cache_dir, with a few bits lost to overheads.

  You can tune the cache_dir avg object size via min-size/max-size
options and thus alter the avg bytes per filemap entry used to better
utilize the disk space.

  If you have squid-2.7 you can also add a COSS directory in any spare
space next to a UFS/AUFS/DiskD drive. That allows a whole separate
fileno index for small files stored in the COSS, large files in the *UFS
cache_dir.

With ~70% of the drive used for ~85% of the cache_dir capacity you are
doing well. That will give you a bit of leeway for the swap.state
journals and some 10% bytes overflow the disk FS often needs to work
efficiently.

Amos

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