[lustre-discuss] ZFS atime is it required?

Kumar, Amit ahkumar at mail.smu.edu
Mon Nov 2 08:42:38 PST 2020

Thank you Andreas!! That is helpful.


From: Andreas Dilger <adilger at whamcloud.com>
Sent: Thursday, October 29, 2020 4:28 AM
To: Kumar, Amit <ahkumar at mail.smu.edu>
Cc: lustre-discuss at lists.lustre.org
Subject: Re: [lustre-discuss] ZFS atime is it required?

On Oct 23, 2020, at 14:03, Kumar, Amit <ahkumar at mail.smu.edu<mailto:ahkumar at mail.smu.edu>> wrote:

Dear All,

Quick question, can I get away by setting "zfs set atime=off on_all_my_voulmes_mgt_mdt_and_osts" ? I ask this as it is noted to be performance boosting tip with the assumption filesystems(Lustre) handles all access times?

You don't really need atime enabled on the OSTs, but I also don't think "atime=off" will make any difference.  That is a VFS/ZPL level option, and Lustre osd-zfs doesn't use any of the ZPL code, but rather handles atime internally.

Cheers, Andreas
Andreas Dilger
Principal Lustre Architect

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