From: Tomasz Chmielewski <mangoo@wpkg.org>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] LVM Overhead
Date: Mon, 24 Sep 2007 19:52:21 +0200 [thread overview]
Message-ID: <46F7F955.7070608@wpkg.org> (raw)
In-Reply-To: <46F7E839.8040805@stercomm.com>
Chris Cox schrieb:
(...)
>>> LVMS=$(/bin/ls /dev/$HOSTNAME/)
>>>
>>> for LVM in $LVMS
>>> do
>>> blockdev --setra 16384 /dev/$HOSTNAME/$LVM
>>> done
>>>
>>>
>> Hmmm, perhaps for iSCSI. But using fibre SAN, I saturate my
>> 2Gbps link (almost 200MB/sec).
>>
>>
>
> I check my local drives, they all use the default 1024....
> Is setting the read ahead that big of a deal with just LVM?
> I would think if it's an issue, it's an issue everywhere.
For me, the default was 256.
I use that big readahead after a bit of benchmarking; perhaps it's very
specific to my setup.
--
Tomasz Chmielewski
http://wpkg.org
next prev parent reply other threads:[~2007-09-24 17:52 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-22 18:25 [linux-lvm] LVM Overhead Joseph L. Casale
2007-09-24 15:05 ` Chris Cox
2007-09-24 15:15 ` Tomasz Chmielewski
2007-09-24 16:34 ` Chris Cox
2007-09-24 16:39 ` Chris Cox
2007-09-24 17:52 ` Tomasz Chmielewski [this message]
2007-09-25 15:13 ` Chris Cox
2007-09-24 18:04 ` Joseph L. Casale
2007-09-26 16:10 ` Chris Cox
2007-09-26 16:59 ` Joseph L. Casale
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