[OpenAFS] Definitive list of AFS Limits?
Thu, 21 Jul 2005 00:16:49 -0500
I'm considering OpenAFS for replacing a large Samba/RAID setup
(10TB), and I'm trying to compile a list of the hard limits in AFS
below, based on searching the mailing list. I'm not sure:
1) if these limits are out of date (some of the messages are quite
2) if there are other important limits I've missed out;
3) if there are practical limits besides these hard limits;
4) of namei/nodei differences.
Any help would be appreciated. I'm sorry if this is considered a
FAQ, but I search the FAW looked back to March on the archive and
didn't see anything.
Minimum file size (overhead): FAQ says 1k file occupies 1k, but
doesn't address overhead.
Maximum file size: 2GB??? (is this still true?)
Maximum files in a directory: The limit depends on the length of the
filenames; if they are all sufficiently short, the limit is around
Maximum files in a volume:
Maximum size of a volume: 4TB
Number of servers for a read/write volume: 1 (by design)
Maximum number of servers for a read only volume:
Maximum size of a partition:
(OS limited? -- linux = 9TB?)
(Be aware that there needs to be a special
compile-time option enabled to support blockdevices larger
Maximum cache size:
> My experience is that you want your client cache to be at least as
> large as the largest files you are using. Performance on files that
> won't fit entirely in the cache is terrible.
... Setting cache size is a bit of a black art.
Total size of largest known AFS installation:
Can an AFS volume be grown in size? Shrunk in size? While online?
[ Christopher Mason MPRC Bioinformatics http://proteomics ]