[9fans] raid on plan9?

[9fans] raid on plan9?

[andrey mirtchovski]

i can't find any information on the wiki about supported raid controllers
under plan9. i can see from urjc.es' site that nemo is running a raid
venti/fossil configuration, but no controller is listed..

can you give me more information about the various raids you use: what
controllers, types of raid and possibly gotchas I should be aware of...
i promise to update the wiki afterwards :)

also, i should assume that there is no driver for the 3COM 3C940 Gigabit
cards, since nobody said they've used one, right?

the raid controller i have in mind comes with asus Asus P4C800 and is a
Promise 20378.

andrey

ps (offtopic) interesting thing, the antares 5070 is somewhat based on
plan9, apparently:

	 The Antares 5070 is a high performance, versatile, yet relatively
	 inexpensive host based RAID controller. Its embedded operating
	 system (K9 kernel) is modelled on the Plan 9 operating system
	 whose design is discussed in several papers from AT&T (see the
	 "Further Reading" section). K9 is a kernel targeted at embedded
	 controllers of small to medium complexity (e.g. ISDN-ethernet
	 bridges, RAID controllers, etc). It supports multiple lightweight
	 processes (i.e. without memory management) on a single CPU
	 with a non-pre-emptive scheduler. Device driver architecture is
	 based on Plan 9 (and Unix SVR4) streams.  Concurrency control
	 mechanisms include semaphores and signals.

Re: [9fans] raid on plan9?

[Jack Johnson]

On Wed, May 07, 2003 at 03:46:00PM -0600, andrey mirtchovski wrote:
> can you give me more information about the various raids you use: what
> controllers, types of raid and possibly gotchas I should be aware of...
> i promise to update the wiki afterwards :)

The RAID setup in the original Venti paper is pretty slick:

http://www.raidking.com/eide.htm

It's basically a box that holds IDE drives and a RAID controller, but
has a SCSI interface.  I think the next time I need storage, this is
exactly the route I'm going to go.  No drivers to hassle with (on the OS
of your choice), etc.

They quoted me $4,212 USD for a 435 rackmount with 480GB (six 80GB drives).
The prices get remarkably better the bigger you go: 1.08TB for $4,632
(until Friday, according to the quote).

I also keep meaning to get my 3ware IDE RAID card running under Plan 9,
but I lack motivation.

(I have a 2-port I might be willing to lend out if someone feels
energetic.)

I suspect most of us are just using fs, though:

http://plan9.bell-labs.com/magic/man2html/3/fs

-Jack