https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-15557 Lustre <p>When a file is mirrored and the mirrored is broken file time stamps should be preserved. Here we see that ctime and mtime change to the mirror creation time.</p> <p>Initial File:</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> # stat testfile File: <span class="code-quote">'testfile'</span> Size: 59535 Blocks: 120 IO Block: 4194304 regular file Device: 521e79ech/1377729004d Inode: 342273918398214817 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2022-02-14 15:48:45.000000000 -0800 Modify: 2022-02-14 15:48:45.000000000 -0800 Change: 2022-02-14 15:48:45.000000000 -0800 </pre> </div></div> <p> <br/> Now we mirror</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> # date; lfs mirror extend -N S 1M -c 1 -p hdd-pool testfile Mon Feb 14 15:50:27 PST 2022 </pre> </div></div> <p>State the File and layout</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> # stat testfile File: <span class="code-quote">'testfile'</span> Size: 59535 Blocks: 120 IO Block: 4194304 regular file Device: 521e79ech/1377729004d Inode: 342273918398214817 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2022-02-14 15:48:45.000000000 -0800 Modify: 2022-02-14 15:48:45.000000000 -0800 Change: 2022-02-14 15:48:45.000000000 -0800 Birth: - pfe25 /nobackupp18/mhanafi # lfs getstripe testfile testfile lcm_layout_gen: 1 lcm_mirror_count: 2 lcm_entry_count: 4 lcme_id: 65537 lcme_mirror_id: 1 lcme_flags: init,prefer lcme_extent.e_start: 0 lcme_extent.e_end: 268435456 lmm_stripe_count: 1 lmm_stripe_size: 16777216 lmm_pattern: raid0 lmm_layout_gen: 0 lmm_stripe_offset: 109 lmm_pool: ssd-pool lmm_objects: - 0: { l_ost_idx: 109, l_fid: [0x90000040a:0x53990:0x0] } lcme_id: 65538 lcme_mirror_id: 1 lcme_flags: prefer lcme_extent.e_start: 268435456 lcme_extent.e_end: 5368709120 lmm_stripe_count: -1 lmm_stripe_size: 16777216 lmm_pattern: raid0 lmm_layout_gen: 0 lmm_stripe_offset: -1 lmm_pool: ssd-pool lcme_id: 65539 lcme_mirror_id: 1 lcme_flags: 0 lcme_extent.e_start: 5368709120 lcme_extent.e_end: EOF lmm_stripe_count: 16 lmm_stripe_size: 16777216 lmm_pattern: raid0 lmm_layout_gen: 0 lmm_stripe_offset: -1 lmm_pool: hdd-pool lcme_id: 131073 lcme_mirror_id: 2 lcme_flags: init lcme_extent.e_start: 0 lcme_extent.e_end: EOF lmm_stripe_count: 1 lmm_stripe_size: 1048576 lmm_pattern: raid0 lmm_layout_gen: 0 lmm_stripe_offset: 0 lmm_pool: hdd-pool lmm_objects: - 0: { l_ost_idx: 0, l_fid: [0x2c0000409:0x30c3e:0x0] } </pre> </div></div> <p>Break the mirror and stat the file. File ctime and atime has changed.</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> date; lfs mirror split -d --mirror-id 1 testfile Mon Feb 14 15:51:31 PST 2022 </pre> </div></div> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> # stat testfile File: <span class="code-quote">'testfile'</span> Size: 59535 Blocks: 120 IO Block: 4194304 regular file Device: 521e79ech/1377729004d Inode: 342273918398214817 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2022-02-14 15:50:27.000000000 -0800 Modify: 2022-02-14 15:48:45.000000000 -0800 Change: 2022-02-14 15:50:27.000000000 -0800 Birth: - </pre> </div></div> LU-15557

creating/breaking mirror should not change file timestamps

Improvement Minor Resolved Not a Bug Colin Faber Mahmoud Hanafi Tue, 15 Feb 2022 00:16:53 +0000 Wed, 22 Jun 2022 20:38:35 +0000 Wed, 22 Jun 2022 20:38:35 +0000 Lustre 2.12.6 0 5 <p>Hi,</p> <p>What version are you running?</p> <p>-cf</p> <p>lustre server/client 2.12.7</p> <p>Generally mirror split will change the block count and therefore should update the ctime. Do you have some workflow or application that is affected by the ctime update?</p> <p>Some users track file time stamps and expect them not to change. </p> <p>Hi <a href="https://jira.whamcloud.com/secure/ViewProfile.jspa?name=mhanafi" class="user-hover" rel="mhanafi">mhanafi</a>,</p> <p><a href="https://jira.whamcloud.com/browse/LU-14508" title="lfs mirror operations do not preserve timestamps" class="issue-link" data-issue-key="LU-14508"><del>LU-14508</del></a> should address this and will be availeble in the 2.15 release.</p> <p>-cf</p> <p>can we get a back port to 2.12.6_ddn and 2.14?</p> <p>Hi <a href="https://jira.whamcloud.com/secure/ViewProfile.jspa?name=mhanafi" class="user-hover" rel="mhanafi">mhanafi</a>,</p> <p>We're still discussing this, because the blocks change on disk, ctime should change (according to POSIX standard), this is expected behavior, (if the blocks don't change, this patch will prevent ctime updates).</p> <p>Because of this we need to discuss how to deliver this with (possibly) a configuration option to turn on and off this behavior.</p> <p>-cf</p> <p>Hi <a href="https://jira.whamcloud.com/secure/ViewProfile.jspa?name=mhanafi" class="user-hover" rel="mhanafi">mhanafi</a> after some discussion with the developers, this behavior is as designed specifically desirable with the creation of new mirrors.</p> Duplicate LU-14508 Development Rank 1|i02idz: Rank (Obsolete) 9223372036854775807 Severity