Re: Looking for the best way to do this

[Phil Turmel <philip@turmel.org>]

Hi Maurice,

[restored CC list....  use reply-to-all on kernel.org lists]

On 06/23/2011 07:26 PM, maurice wrote:
> On 6/23/2011 4:55 PM, Phil Turmel wrote:
>> Hi maurice,
> 
> Hi Phil
> 
> That was great, thank you!
> 
> I gather that the R10 results ion a faster disk IO, in general?
> Probably with the  "far" version, if we are mostly reading?

For most applications, yes.  I haven't benchmarked it myself, though.

> I would be willing to lose redundancy for the duration of the creation process.
> Both disks presently seem to be OK.

You'll also be offline while copying and switching to the new filesystem.  Did you want layout=f2 or =f3 ?

> Any chance you could "wrap up" for me with the correct syntax for this?
> I find that the "trial and error " approach is less than optimal.

First, run a check on your array, to minimize the chance of a read error during the copy:

echo "check" >/sys/block/md*/md/sync_action

While that's running, send me the output of "lsdrv", which will let me give advice with real device names:

wget -O /usr/sbin/lsdrv http://github.com/pturmel/lsdrv/raw/master/lsdrv ; chmod 755 /usr/sbin/lsdrv ; lsdrv

Phil