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-17008 Lustre <p>'lfs stripe -o 0-3,0-3 &lt;DIR&gt;' allowed  today and it enables overstriping across OST0-3 automatically.</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre># mkdir out # lfs getstripe out out stripe_count: 1 stripe_size: 1048576 pattern: 0 stripe_offset: -1 # lfs setstripe -o 0-3,0-3 out [root@ec01 exafs]# lfs getstripe out out stripe_count: 8 stripe_size: 1048576 pattern: raid0,overstriped stripe_offset: 0 </pre> </div></div> <p>this is a useful option, but, command help didn't mention about that.</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre> ost_indices: List of OST indices, can be repeated multiple times Indices be specified in a format of: -o &lt;ost_1&gt;,&lt;ost_i&gt;-&lt;ost_j&gt;,&lt;ost_n&gt; Or: -o &lt;ost_1&gt; -o &lt;ost_i&gt;-&lt;ost_j&gt; -o &lt;ost_n&gt; If --pool is set with --ost then the OSTs must be the members of the pool. </pre> </div></div> <p>it would be better to add about overstriping and an example.</p> LU-17008

improve man and help of lfs-stripe command about overstripe

Improvement Minor Open Unresolved WC Triage Shuichi Ihara Tue, 1 Aug 2023 23:27:38 +0000 Tue, 1 Aug 2023 23:46:20 +0000 0 2 <p>Also, the "<tt>lfs getstripe</tt>" on the directory with the specific layout is not very clear. It shows only the <tt>stripe_count</tt> and <tt>stripe_offset</tt>, but doesn't actually show that this is picking specific OSTs.</p> <p>Using a PFL layout appears not to preserve the specific OSTs in the directory default layout, unlike the plain layout above:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>$ lfs setstripe -E 1M -c 1 -E 16G -o 3,2,1 -c 3 -E eof -c -1 /myth/tmp/adilger/pfldir $ touch /myth/tmp/adilger/pfldir/pflfile $ dd if=/dev/zero of=/myth/tmp/adilger/pfldir/pflfile bs=1M count=1 seek=17k $ lfs getstripe /myth/tmp/adilger/pfldir/pflfile /myth/tmp/adilger/pfldir/pflfile lcm_layout_gen: 4 lcm_mirror_count: 1 lcm_entry_count: 3 lcme_id: 1 lcme_mirror_id: 0 lcme_flags: init lcme_extent.e_start: 0 lcme_extent.e_end: 1048576 lmm_stripe_count: 1 lmm_stripe_size: 1048576 lmm_pattern: raid0 lmm_layout_gen: 0 lmm_stripe_offset: 1 lmm_objects: - 0: { l_ost_idx: 1, l_fid: [0x100010000:0x283f79:0x0] } lcme_id: 2 lcme_mirror_id: 0 lcme_flags: init lcme_extent.e_start: 1048576 lcme_extent.e_end: 17179869184 lmm_stripe_count: 3 lmm_stripe_size: 1048576 lmm_pattern: raid0 lmm_layout_gen: 0 lmm_stripe_offset: 3 lmm_objects: - 0: { l_ost_idx: 3, l_fid: [0x100030000:0x2d9d42:0x0] } - 1: { l_ost_idx: 2, l_fid: [0x100020000:0x4a930c:0x0] } - 2: { l_ost_idx: 1, l_fid: [0x100010000:0x283f7a:0x0] } lcme_id: 3 lcme_mirror_id: 0 lcme_flags: init lcme_extent.e_start: 17179869184 lcme_extent.e_end: EOF lmm_stripe_count: 5 lmm_stripe_size: 1048576 lmm_pattern: raid0 lmm_layout_gen: 0 lmm_stripe_offset: 0 lmm_objects: - 0: { l_ost_idx: 0, l_fid: [0x100000000:0x2b646a:0x0] } - 1: { l_ost_idx: 2, l_fid: [0x100020000:0x4a930d:0x0] } - 2: { l_ost_idx: 3, l_fid: [0x100030000:0x2d9d43:0x0] } - 3: { l_ost_idx: 4, l_fid: [0x100040000:0x40ed8f:0x0] } - 4: { l_ost_idx: 1, l_fid: [0x100010000:0x283f7b:0x0] } </pre> </div></div> Development Rank 1|i03s2f: Rank (Obsolete) 9223372036854775807 Severity