On 03/02/2016 01:54 AM, Fred Drueck wrote:
Hello Everyone,
According to the OpenAFS admin FAQ, it appears that the officially
supported file systems for the disk cache are:
ext2
ext3
hfs (HP-UX)
xfs (at least on IRIX 6.5)
ufs (Solaris, ?Tru64Unix)
which is clearly out of date, since there is a working implementation
for OS X that runs on top of HFS+
For some time I've been fearlessly using both ext4 and btrfs (on
Linux, as you might infer) as the backing storage for my AFS client cache.
I have noticed some fairly rare issues with the clients if all file/db
servers (in our cell the same machines) become unavailable. The
'/afs' mount becomes un-accessible and attempts to access files often
result in very long timeouts. I've always been able to fix things by
somehow shutting down the client (in the worst case by physical
power-off and reboot into single user mode) and deleting the cache.
Is there some chance that this is because I've been causing these
problems by using un-supported file-systems as the backing storage for
the client cache?
I'm using fairly recent versions of the client, namely the version
packaged for debian-squeeze, debian-wheezy, ubuntu 14.04, and a very
recent release on Arch Linux.
e.g.
1.6.9-2+deb8u4~bpo70+1
Version: 1.4.12.1+dfsg-4+squeeze4
Version: 1.6.7-1ubuntu1.
openafs 1.6.14.1-1
For the most part, though, I haven't had many issues. Does anyone
know any updated info on what the supported client filesystems are?
Thanks!
-Fred
I've been using an ext4 partition for my cache for years now. There are
several additional optimizations that can be done, but the only one I
remember at the moment is to create the filesystem without a journal.
Because ext4 natively allocates extents, these can directly map to cache
chunks.
I've been happy.
Dale Pontius
--
Dale Pontius
Senior Engineer
IBM Corporation
Phone: (802) 769-6850
Tie-Line: 446-6850
email: [email protected]
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