[Lustre-discuss] Delete file entries from Metadata server

[Mag Gam]

This data is really not important. When I tried to remove it I keep
getting, "Numerical result out of range".

Is there something else I can do?



On Wed, Mar 25, 2009 at 12:50 PM, Brian J. Murrell
<Brian.Murrell at sun.com> wrote:
> On Wed, 2009-03-25 at 11:29 -0500, Robert Olson wrote:
>> I thought I had read at some point that there is a performance hit
>> associated with putting the OST on a LV;
>
> There is nothing particular about an OST on an LV that makes it perform
> any worse than anything else on an LV.  That said I don't know what
> overhead there is in using an LV over a raw block device.  I've been
> using LVs exclusively on all of my (non Lustre) systems for many many
> years and I've never felt that they were unacceptably slow.
>
> You might want to benchmark just to have hard numbers on your side.
> Benchmarking LVs against the raw block device should be trivial.
>
>> or is that just the case when there are snapshots in play?
>
> Yes, there is definitely a penalty when snapshots are in play since
> every write to a block on the origin that has not been written since the
> snapshot is actually two writes to copy (or move -- I'm not sure) the
> block to the snapshot before writing the new data in the origin.
>
>> Do you recommend using LV's in general when configuring the OST?
>
> We don't recommend one way or the other.  It's really a matter of
> personal choice.
>
> b.
>
>
>
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss
>
>