From: Oleg Volkov <oleg@bitband.com>
To: linux-lvm@sistina.com
Subject: Re: [linux-lvm] Apparent performance degradation for each PV with striping
Date: Mon, 19 Mar 2001 10:48:52 +0200 [thread overview]
Message-ID: <3AB5C7F4.A9CCCB0B@bitband.com> (raw)
In-Reply-To: 3AB59501.FF6ED9F3@dataventures.com
Donald Thompson wrote:
> dd if=/dev/ide/host0/bus0/target0/lun0/disc of=/dev/null
> gave me around 5500 blocks read per second.
>
> lvcreate -i4 -I4 -L somesize vgname -n lvname
>
> My system:
>
> Linux 2.4.2
> Libc 2.1.3
> Debian Potato
> LVM 0.9.1_beta6 utilities and patch.
> ATA 100 IDE interfaces on MB
> idebus set to 66 in /etc/lilo.conf
> CPU is Athlon 1000mhz thunderbird
> 256 megs of RAM
>
> -Don
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
80G disks may be IBM or Maxtor disks ( right ? )
I had experience with IBM disks. A good stripe
size for them is 64k. I don't know about Maxtor disks
but you can play with stripe size around 64k also.
Basically 64k is a DMA buffer size and should be good.
So try to use -I64 not -I4.
--
Volkov Oleg
BitBand Technologies Ltd.
http://www.bitband.com
next prev parent reply other threads:[~2001-03-19 8:48 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-19 5:11 [linux-lvm] Apparent performance degradation for each PV with striping Donald Thompson
2001-03-19 5:20 ` Eric M. Hopper
2001-03-22 8:55 ` Russell Coker
2001-03-19 6:03 ` lvm
2001-03-19 7:05 ` Donald Thompson
2001-03-19 9:15 ` Joe Thornber
2001-03-19 7:06 ` Jason Walker
2001-03-19 8:48 ` Oleg Volkov [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-03-19 13:34 S. Michael Denton
2001-03-19 13:44 ` Steven Lembark
2001-03-22 8:54 ` Russell Coker
2001-03-22 9:53 ` Ragnar Kjørstad
2001-03-22 12:19 ` zoo1
2001-03-22 8:58 ` Russell Coker
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