RE: [9fans] SCSI or IDE?

["Nigel Roles" <nigel@9fs.org>]

How long did it take to copy the old dump filesystem into venti?
I know venti will reduce the data nicely, but I have about 1000
dumps, and this mornings holds 2.8Gb (the first ever is 170Mb).
A rough guesstimate is that I have to send Venti about 1.5Tb.

I'd assumed that copying the dump into Venti would have taken
way too long.

What is the typical throughput to a Venti server when writing?
Presumably the hash computation dominates?

-----Original Message-----
From: 9fans-admin@cse.psu.edu [mailto:9fans-admin@cse.psu.edu]On Behalf
Of Fco.J.Ballesteros
Sent: 31 March 2003 08:33
To: 9fans@cse.psu.edu
Subject: Re: [9fans] SCSI or IDE? 


I'm pretty happy using ide disks. They're fast enough and
you always have a spare one hanging around just in case one of your
disks fails. 

Regarding fossil, I'm using two 40G ide disks where I made partitions
for venti and fossil. I make the same partitions on both and use fs(3)
to mirror them. both venti and fossil run on the mirror (see the example
below).

I copied all the dumps in our worm fs to venti. Our 9fs script uses
vacfs to mount pre-fossil dumps and binds them along with fossil archive.

We keep the old worm disks inside the old file server but disconnected
(no bus), just to preserve them in case of a cataclism. The old file
server is actually a terminal now.

For us, our authentication server is also our file server (and services
httpd and smtpd as well). Since everything else is a terminal we dont need
to maintain separate configurations. 

Just to make an example, right now I have these partitions for
venti arenas, index, fossil, and a fossil partition not backed up by
venti:

# arenas and index
part other 63 20723850
part other1 20723850 22972950
# fossil (backed up by venti)
part fossil 22973000 27792450
# fossil (unbacked)
part once 27792515 36146250
# there's more room in the disk, to become arenas in the future.

Then in /boot we mirror them all like in:

echo mirror once /dev/sdC0/once /dev/sdD0/once >/dev/fs/ctl

and start venti and fossil using them:
# venti.conf
index oldworm
isect /dev/fs/other1
arenas /dev/fs/other

# flproto
...
fsys main config /dev/fs/fossil
fsys once config /dev/fs/once

Very long message, but hth.