[LU-3767] 32TB OST support in 1.8.9 Created: 15/Aug/13  Updated: 14/Sep/13  Resolved: 14/Sep/13

Status: Resolved
Project: Lustre
Component/s: None
Affects Version/s: Lustre 1.8.9
Fix Version/s: None

Type: New Feature Priority: Major
Reporter: Blake Caldwell Assignee: James Nunez (Inactive)
Resolution: Incomplete Votes: 0
Labels: None
Environment:

RHEL5.9, distribution provided ib stack

Rank (Obsolete): 9701

 Description   

I understand that ldiskfs has not been extensively tested on LUNs over 24TB with lustre 1.8.x and el5.x and the force_over_24tb option is required to format a larger LUN. We would like to take advantage of 32TB LUNS from a RAID6 with 8x4TB drives if at all possible on a 1.8 branch. Has testing on larger OSTs been undertaken since LU-136, which appeared to only test 128TB on the 2.1 code? Are there any other issues that might prevent 32TB OSTs from working?

 Comments   
Comment by Blake Caldwell [ 15/Aug/13 ]

LU-419 enabled the 64-bit feature to allow formatting LUNS larger than 16TB and was landed in 1.8.7

Comment by Peter Jones [ 15/Aug/13 ]

James

Please can you help with this one?

Thanks

Peter

Comment by James Nunez (Inactive) [ 15/Aug/13 ]

Blake,
I'm looking into if there are any issues with 32TB OST in 1.8.9.

By the way, what version of e2fsprogs are you using?

Thanks,
James

Comment by Blake Caldwell [ 15/Aug/13 ]

e2fsprogs-1.42.3.wc3-0redhat

and 2.6.18-348.3.1.el5 kernel

Comment by James Nunez (Inactive) [ 15/Aug/13 ]

Thanks for the info, Blake.

I'm just trying to find out if there was a technical reason why the patch for b1_8 http://review.whamcloud.com/#/c/589/ only increased the max OST size from 16 TB to 24TB and not larger.

Comment by James Nunez (Inactive) [ 16/Aug/13 ]

Prior to landing http://review.whamcloud.com/#/c/589/1, format and mount of 128TB LUNs with 1.8.6 were successful using the "force_over_16tb" flag. Only a partial test, llverdev and llverfs, was run on the 128TB LUNs. Full tests were not run.

Officially, we've only tested and support up to 24TB LUNs for 1.8.x, but it looks like it just may work.

Comment by James Nunez (Inactive) [ 14/Sep/13 ]

ORNL has decided to not test/create 32TB LUNs for use with their 1.8 file systems. Thus we are closing this ticket since the testing is no longer needed.

Please reopen this ticket if there is a desire to put 32 TB LUNs into production.

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