[OpenAFS] AFS cache configuration

Mon, 16 Apr 2018 12:19:25 +0300

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Hello,

I am running an OpenAFS 1.6.11 client against a set of 1.6.20 servers. I =

am trying to find out if my client's cache is underutilized or thrashing =

because if it running out of entries. I've read the documentation here ( =

http://docs.openafs.org/Reference/5/afs_cache.html ) and the afsd page=20
here ( http://docs.openafs.org/Reference/8/afsd.html ) but I think I=20
still don't have the whole picture. So I'd like some help understanding=20
the disk based cache configuration.

My cache is configured via /etc/openafs/cacheinfo with 1000000 blocks=20
(1GB) of maximum space. afsd is started with -dynroot -fakestat -afsdb=20
flags.

Now, what I read from the afsdb manual my chunksize by default should be =

between, 256KB and 1MB. I can tell by looking at the Vn files in the=20
cache directory that chunksize is 1M, since there is no file greater=20
than this size while a few are more than 1023KB.

I also read that my Vn files number should by default be chosen as the=20
greater of (100, 1000000/10240, or 1.5*1000000/1024). The latter being=20
the greater I'd expect to find no more than 1464 Vn files in my cache=20
directory. Contrary to this, du --inodes says there are 31270 files in=20
my cache directory. Indeed, the highest numbered Vn file is V31249 and=20
the rest of used inodes can be attributed to parent directory entries.

So what am I missing here? How does the cache manager calculate the=20
limit to Vn files?

Thanks in advance,

-Kostas.

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