My project wish-list for the next 12 months
Peter Ross
Peter.Ross at alumni.tu-berlin.de
Wed Dec 8 21:44:31 PST 2004
Scott Long, Wed Dec 1 14:02:28 PST 2004
> 5. Clustered FS support. SANs are all the rage these days, and
> clustered filesystems that allow data to be distributed across many
> storage enpoints and accessed concurrently through the SAN are very
> powerful. RedHat recently bought Sistina and re-opened the GFS source
> code, so exploring this would be very interesting.
As we see there are some unfinished pieces (BTW: The freebsd-cluster list
is very quiet).
I browsed through some of them. It is difficult to judge how far they away
from beeing mature.
There is:
1) 2x AFS
(BSD project, OpenAFS)
2) iSCSI
The Lucent code
Peter Blok seems to have some ideas comparable to mine when I started
to play with iSCSI at FreeBSD when I was unemployed last year.
(Unfortunatelly not long enough;-)
My naive idea for network mirroring to get basic SAN multipath
functionality is to combine vinum + iSCSI. Is it achievable?
3) NFSv4
NFS Version 4 is part of FreeBSD now. There is an idea to implement
replication but AFAIK it is not implemented yet (I have to check).
At least there is a whitepaper:
http://www.citi.umich.edu/projects/nfsv4/reports/replication.pdf
It could be used as a frontend for concurrent access (NFSv4 provides
_real_ locking including byterange locking etc.)
There are some ideas to implement concurrent access in UFS.. Is it the
right place? (Hint: There are many Linux filesystems with beautiful
features but it is hard to find a reliable one - possibly because the
featuritis makes them too complex?)
Maybe it is better to have one specialised filesystem (see Veritas as
already mentioned). Or a layer above the "real" FS.
BTW: AFAIK ReiserFS (suggested as a FreeBSD port) does not support ACLs..
Regards
Peter
More information about the freebsd-current
mailing list