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From: Herbert Poetzl <herbert@13thfloor.at>
To: linux-lvm@sistina.com
Subject: Re: [linux-lvm] LVM on Raid 5 Performance?
Date: Mon May 19 06:31:02 2003	[thread overview]
Message-ID: <20030519113159.GA23496@www.13thfloor.at> (raw)
In-Reply-To: <200305182148.27901.jason@oes.co.th>

On Sun, May 18, 2003 at 09:48:27PM +0700, Jason H. Smith wrote:
> I don't know if this answers your question, but maybe search the archives 
> for my posts a few months ago.  On 2.4, there's a misfeature when using 
> LVM with RAID5.  Basically, the two will cause your system not to cache 
> any data, and to sync to disk immediately, once you create a snapshot 
> volume.  Apparently, this will be addressed in 2.6.

hmm, I read about that, but I guess that's not what 
happens, because a) I do not use the snapshot feature,
and b) the "raid5: switching cache buffer size" messages
only appear if I access the md device directly ...

> So if you want RAID5 and LVM, consider hardware acceleration.

I guess I will choose not to use LVM on this system ...

thanks,
Herbert

> HTH
> 
> -- 
> GPG: 03EE 9EB8 E500 874A F509  7B95 9B9A 84A1 26E9 4F79
> http://www.ece.utexas.edu/~jhs/public_key.gpg
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

  reply	other threads:[~2003-05-19  6:31 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-05-14  9:07 [linux-lvm] LVM on Raid 5 Performance? Little, Chris
2003-05-15  3:01 ` Herbert Poetzl
2003-05-19  1:25 ` Jason H. Smith
2003-05-19  6:31   ` Herbert Poetzl [this message]
2003-05-24 19:11   ` Steven Lembark
  -- strict thread matches above, loose matches on Subject: below --
2003-05-15  9:51 Little, Chris
2003-05-15  3:49 Rick van der Linde
2003-05-15 16:45 ` Herbert Poetzl
2003-05-13  9:57 Little, Chris
2003-05-14  3:21 ` Herbert Poetzl
2003-05-13  8:36 Herbert Poetzl

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