Date: Thu, 9 Dec 2004 16:44:29 +1100 (EST) From: "Peter Ross" <Peter.Ross@alumni.tu-berlin.de> To: <freebsd-current@freebsd.org> Subject: Re: My project wish-list for the next 12 months Message-ID: <54038.211.26.240.17.1102571069.squirrel@mailbox.TU-Berlin.DE>
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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@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
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