[OpenAFS-devel] Re: replacing ptsserver for AD integration

[Atro Tossavainen]

Brett,

> 1) How are people doing AFS backups with networker?

We're using a pair of home-cooked scripts that (IIRC) I got from Nathan
Neulinger.

> Ditch the ACLs and just do incrementals using the /afs filespace?

(And be sure not to have any links to foreign cells anywhere in AFS
 lest you start backing up the whole world at a _very_ slow rate :)

> Use Box Hill vosasm and backup entire volumes at a time but preserve
> ACLS?

This is in effect what the scripts I mentioned are doing, with the
obvious exception that it has nothing to do with Box Hill vosasm.
They make "vos dump"s of volumes to local disk, then store the dumps
on tape using "save" as usual.

I suppose there's no reason why the scripts couldn't do what vosasm
does and "nsrfile" the stream directly from "vos dump", other than
that you are more likely to get good performance from modern tape
drives by feeding them from flat files on disk.

With AFS 3.6 2.51 on a 1*1 GHz Sun Fire V240, I'm getting up to 14 MB/s
on a "vos dump" from a Compaq RA8000 3+1 RAID5 volume to a DiskSuite
RAID0 scratch area on the dual internal drives of the Sun.  Raw 1MB
reads from the array with dd give me >30 MB/s.  Raw 1MB writes to and
reads from the internal scratch area run at 40 MB/s.

I suppose I have a tangentially related question: Would the OpenAFS
volserver provide any substantial speed improvements?  I could do with
shortening our backup windows.

-- 
Atro Tossavainen (Mr.)               / The Institute of Biotechnology at
Systems Analyst, Techno-Amish &     / the University of Helsinki, Finland,
+358-9-19158939  UNIX Dinosaur     / employs me, but my opinions are my own.
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