[OpenAFS] Re: Linux ext4 vicep and cache support?

John W. Sopko Jr. sopko@cs.unc.edu
Wed, 25 Jan 2012 14:21:12 -0500

Thanks, all. It has been at least a year since we tried
running the cache on ext4 with 1.4.12 client and I have
never tried on a fileserver /vicep partition.

Our current AFS file servers are redhat 5.7 ext3. When we
get new servers they will be redhat 6.x and ext4.

When we upgrade clients to 1.6 I will try ext4 cache.

Andrew Deason wrote, On 1/25/2012 11:05 AM:
> On Wed, 25 Jan 2012 09:38:30 -0500
> "John W. Sopko Jr."<sopko@cs.unc.edu>  wrote:
>> Is it safe to use ext4 for /vicep partitions?
>> The install docs do not mention file system type
>> requirements.
> Filesystem doesn't matter for /vicep, for the most part. You can use any
> fs as long as we get 'normal' unix-y features with it (owner, group,
> access modes, etc; I assume just saying "POSIX" is enough). The server
> processes generally don't do anything special with the files in there,
> except for setting the owner, group, and mode bits to "strange" things.
>> In the past we had issues with ext4 as a client cache partitions and
>> continue to use ext3, has anything changed?
> 1.6 clients use a different mechanism for accessing the cache, and
> should no longer be limited to particular file systems. All versions of
> 1.4 I believe still have the same cache fs restrictions, which limits
> you to ext2/3.
> That is, assuming Linux 2.6+. Nearly all Linux-specific changes to 1.6
> clients don't apply to Linux 2.4 and earlier.

John W. Sopko Jr.               University of North Carolina
email: sopko AT cs.unc.edu      Computer Science Dept., CB 3175
Phone: 919-962-1844             Fred Brooks Building; Room 140
Fax:   919-962-1799             Chapel Hill, NC 27599-3175