[mythtv-users] Raid Performance Tweaking

[Debabrata Banerjee]

Whatever you do it's going to be irrelevant for mythtv unless you add a 
massive amount of tuners. Unless you decide to make a RAID array out of 4GB 
disks from 1996.. Even one disk should be good for many streams of video. 
Let's not confuse Mbit and MBytes, as people often do.

----- Original Message ----- 
From: "John Drescher" <drescherjm at gmail.com>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Thursday, July 06, 2006 5:06 PM
Subject: Re: [mythtv-users] Raid Performance Tweaking


>I think the problem here is that guide is very outdated. Did you see the
> computer they were using "Dual Pentium Pro 150 MHz"? I bet that was on
> a 2.2kernel also so to me any numbers there are meaningless. At work I
> use 256K
> or 512K blocks on my 1TB or 2TB raid 5 or raid 6 arrays. My latest server
> build featured 6 X 320 GB seagate 7200.10 drives in a raid 6 256K clusters
> for ~ 1.2TB of raid space. With that setup on a Athlon64 M2 3200 system
> (asus mobo) I get ~260 MB/s on the non cached hdparm benchmark.
>
> John
>
> On 7/6/06, Dean Wilson <dean.k.wilson at gmail.com> wrote:
>>
>> I know that many of us are interested in Raid, but don't really know
>> the best configuration for a myth setup.  I, like many others here, am
>> interested in Raid5, and would like it to perform optimally for (very)
>> large files.
>>
>> I've read http://www.tldp.org/HOWTO/Software-RAID-HOWTO-9.html, which
>> gets into chunk and block size performance testing, but doesn't use
>> chunks above 32K.  I would think that a larger chunk size would be
>> ideal for myth, as it uses exceedingly large files.
>>
>> I figured I'd use bonnie to measure performance gains/losses, since
>> that's what the howto used.  Obviously I'll play with different
>> chunk/block size combinations, and will report my findings.  But I'm
>> curious to know if anyone out there would be interested in any other
>> specific tests?  If so, let me know -- I'll try to include them, and
>> will put together a web page with the results I find.
>>
>> Thanks,
>> ~Dean
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>>
>


--------------------------------------------------------------------------------


_______________________________________________
mythtv-users mailing list
mythtv-users at mythtv.org
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users