Re: [linux-lvm] LVM Overhead

[Tomasz Chmielewski <mangoo wpkg org>]

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