[Lustre-discuss] Hardware Question

Lundgren, Andrew Andrew.Lundgren at Level3.com
Wed Oct 10 08:40:25 PDT 2007


As RH 5.1 will support 16TB ext3 partitions, will lustre inherit that
functionality? 

> -----Original Message-----
> From: lustre-discuss-bounces at clusterfs.com 
> [mailto:lustre-discuss-bounces at clusterfs.com] On Behalf Of 
> Andreas Dilger
> Sent: Wednesday, October 10, 2007 9:26 AM
> To: Aaron Knister
> Cc: lustre-discuss at clusterfs.com
> Subject: Re: [Lustre-discuss] Hardware Question
> 
> On Oct 06, 2007  10:28 -0400, Aaron Knister wrote:
> > Oh, right I forgot about that. Well...if i had an 8tb lun 
> and split it 
> > into 2 volume groups using LVM do you think the performance 
> would be 
> > worse than making 2 raids at the hardware level?
> 
> Well, it won't be doing the disks any favours, since you'll 
> now have contention between the OSTs, and the kernel will be 
> doing a poor job with the IO elevator decisions.  I would 
> suggest making 2 smaller RAID LUNs instead.
> 
> In the end it is up to you to decide if the IO performance is 
> acceptable.
> You can do some testing using lustre-iokit to see what the 
> component device performance is.
> 
> > On Oct 5, 2007, at 6:18 PM, Andreas Dilger wrote:
> > 
> > >On Oct 05, 2007  13:14 -0400, Aaron Knister wrote:
> > >>Make that 6x 9.7TB luns.
> > >
> > >Lustre (== ext3) doesn't support >= 8TB LUNs.
> > 
> 
> Cheers, Andreas
> --
> Andreas Dilger
> Principal Software Engineer
> Cluster File Systems, Inc.
> 
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