Hello Justin & all ,
----------Justin Piszcz Wrote: ----------
Date: Wed, 26 Sep 2007 12:24:20 -0400 (EDT)
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Subject: Re: mkfs options for a 16x hw raid5 and xfs (mostly large files)
I have a question, when I use multiple writer threads (2 or 3) I see 550-600
MiB/s write speed (vmstat) but when using only 1 thread, ~420-430 MiB/s... Also
without tweaking, SW RAID is very slow (180-200 MiB/s) using the same disks.
Justin.
Speaking of 'without tweaking' , Might you have or know of a relatively
accurate list of points to begin tweaking & possible( even guesses at the) out
come of making those changes ?
We(maybe even I) could put together a patch for tuning options in the
Documentation directory (&/or other files if necessary) .
The kernel method would allow those with 'doxygen' (amongst other
installed tools ) acquire a mediocum of information .
The info could be , ear marked . Such as fs-tunable , disk-tunable ,
for ease of identification of the intended subject matter .
Tho without a list of the present known tunables I am probably going to
find the challenge a bit confusing as well as time consuming .
At present I believe I (just might) be able to , with everyones help ,
put together a list for the linux-raid tunables . Note: 'with everyones help'
.
Just thoughts .
... much good info snipped...
Tia , JimL
--
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| James W. Laferriere | System Techniques | Give me VMS |
| Network Engineer | 663 Beaumont Blvd | Give me Linux |
| babydr@xxxxxxxxxxxxxxxx | Pacifica, CA. 94044 | only on AXP |
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