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-15424 Lustre <p>Currently, "<tt>lfs migrate</tt>" does not work very well for FLR mirrored files. If an FLR mirrored file is migrated, it will replace all of the mirrors with the target layout. It is not currently possible to migrate only a single mirror of a file.</p> <p>It is not even <em>possible</em> to specify a mirrored layout for the target file ("<tt>lfs migrate</tt>" apparently doesn't parse the options correctly, and even if this was working it would significant increase write amplification to make multiple copies of a file for the common case of trying to remove objects from a specific OST.</p> <p>It should be possible for "<tt>lfs migrate</tt>" to properly migrate only a single FLR mirror of a file by specifying <tt>&#45;&#45;mirror&#45;id</tt> or <tt>&#45;&#45;comp&#45;id</tt> as with "<tt>lfs mirror split</tt>". Internally, this might be implemented by extending the file with a new FLR mirror using the specified layout and then removing the old mirror, but the user interface should make this transparent.</p> LU-15424

allow 'lfs migrate' for only a single FLR mirror

Improvement Minor Open Unresolved WC Triage Andreas Dilger FLR2 Sun, 9 Jan 2022 18:42:20 +0000 Sun, 9 Jan 2022 18:47:19 +0000 0 1 <p>It may also be useful in relation to <a href="https://jira.whamcloud.com/browse/LU-9961" title="FLR2: Relocating objects to a new OST" class="issue-link" data-issue-key="LU-9961">LU-9961</a> to specify "<tt>--source-ost=N</tt>" (or similar, possibly multiple times or a comma-separated list) to select the mirror to migrate/remove. That would initially just select the mirror for removal, but could eventually allow replacing only the specific object.</p> Related LU-9961 Development Epic Link EX-4353 Rank 1|i02e27: Rank (Obsolete) 9223372036854775807