From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 02 Sep 2004 15:15:51 -0500 From: "P. Larry Nelson" Subject: Re: [linux-lvm] 2 TB limit In-reply-to: <20040512163244.C23665@homer.msp.redhat.com> Message-id: <41377F77.7050201@uiuc.edu> MIME-version: 1.0 Content-transfer-encoding: 7bit References: <005601c412af$748d71a0$1fa0a8c0@blec> <200403261813.50041.krustev@krustev.net> <20040326161644.GF12948@null.msp.redhat.com> <20040512163244.C23665@homer.msp.redhat.com> Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; format="flowed"; charset="us-ascii" To: LVM general discussion and development Cc: agk@redhat.com On 5/12/2004 4:32 PM, Alasdair G Kergon wrote: > On Fri, Mar 26, 2004 at 10:16:44AM -0600, AJ Lewis wrote: > >>The PE size limitation isn't present in lvm2 (The version of lvm that works >>in 2.6) if you use the native lvm2 format. So you should be able to create >>larger than 2TB LVs with LVM2. Just FYI. > > > As those of you monitoring the lvm-cvs mailing list may have noticed, > I've added code to the LVM2 CVS tree to help people simulate large devices > for testing purposes on 2.6 kernels with the latest -udm patches. > > lvcreate --type zero -L16T vg # Create 16TB 'zero' device > lvcreate -s vg/lvol0 -L1G # Create snapshot of it > > Then use the snapshot as a 'sparse' device, in the example, supporting > upto 1GB of actual data. > > [At some point I'll merge it into a one-line command with --type sparse] > > NB There's been a lot of change in CVS recently (and more to come) > so I expect some new bugs to show up along with the new features:-( > > Alasdair Being confined to running RedHat and using their updates and RPMs, I'm running stock RHEL-ES3 file servers with latest RH kernel of 2.4.21-15.0.4.ELsmp and lvm-1.0.3-15. I'm led to understand that the ES3 kernel has portions of the 2.6 kernel in it, but I don't think it has the portion that can handle >2TB file systems. I have had a need to go to >2TB file systems for some time and am sort of limping along by stringing together many 2TB file systems. Can anyone (perhaps our list contributor from RedHat?) tell me when I can expect a kernel and lvm from RedHat that will allow me to go beyond the 2TB limit? Thanks! - Larry -- P. Larry Nelson (217-244-9855) | Systems/Network Administrator 461 Loomis Lab | U of I, CITES Departmental Services 1110 W. Green St., Urbana, IL | Consultant to: High Energy Physics Group MailTo:lnelson@uiuc.edu | http://www.uiuc.edu/ph/www/lnelson ------------------------------------------------------------------------- "Information without accountability is just noise." - P.L. Nelson