[linux-lvm] LVM Overhead
Tomasz Chmielewski
mangoo at wpkg.org
Mon Sep 24 17:52:21 UTC 2007
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
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