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Date: Tue, 23 Nov 2004 14:20:07 +0100
From: Ivan Voras <ivoras@fer.hr>
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Subject: Re: gvinum panic?
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Lukas Ertl wrote:
> On Mon, 22 Nov 2004, Ivan Voras wrote:
> 
>> I'm consistently getting a system panic, trap #12 in process g_event 
>> when I try:
> 
> 
> Are you sure that kernel (modules) and userland are in sync?

Thanks, it looks like they've been unsynced for a while :(
It's ok now.

But, the performance is pretty bad (same with regular vinum). I tried 
setting up graid3 class with same parameters, and got these results:

linear read (1024 MB file, blocks of 32768) .................  38.5 MB/s
linear write (1024 MB file, blocks of 32768) ................  16.8 MB/s
random read (1024 MB file, blocks of 32768) .................  41.9 MB/s
random write (1024 MB file, blocks of 32768) ................   3.4 MB/s


with raid5, gvinum or vinum, I get these:

linear read (1024 MB file, blocks of 32768) .................  27.8 MB/s
linear write (1024 MB file, blocks of 32768) ................   4.2 MB/s
random read (1024 MB file, blocks of 32768) .................  44.2 MB/s
random write (1024 MB file, blocks of 32768) ................   1.9 MB/s

(random reads are really random, no clustering or anything).
My setup is 2 IDE channels with three discs, so one is a slave (and 
contains the parity disc in case of raid3). Do these numbers make sense? 
I'll certainly go with raid3 as it is...