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-2754 Lustre <p>Here sys_rename is a trivial program that just calls rename(argv<span class="error">&#91;1&#93;</span>, argv<span class="error">&#91;2&#93;</span>) and check for error.</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre># export MDSCOUNT=2 # llmount.sh # cd /mnt/lustre # find . . ./.lustre # lfs mkdir -i 1 m1 # echo 0 &gt; f0 # echo 1 &gt; m1/f1 # find . . ./f0 ./m1 ./m1/f1 ./.lustre # sys_rename m1/f1 f0 # find . . ./f0 ./m1 ./.lustre # cat f0 0 # rm f0 </pre> </div></div> <p>In the same situation I can get a simple rename or rename-onto an existing directory on MDT0 to return succeess but lose the old dir.</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre># find . . ./m1 ./.lustre # mkdir d0 # mkdir m1/d1 # touch m1/d1/f1 # find . . ./d0 ./m1 ./m1/d1 ./m1/d1/f1 ./.lustre # sys_rename m1/d1 d0 # find . . ./d0 ./m1 ./.lustre # </pre> </div></div> <p>Rename onto may require several attempts:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre># mkdir d0 # mkdir m1/d1 # touch m1/d1/f0 # find . . ./d0 ./m1 ./m1/d1 ./m1/d1/f0 ./.lustre # sys_rename m1/d1 d0 cannot rename `m1/d1' to `d0': Directory not empty # sys_rename m1/d1 d0 cannot rename `m1/d1' to `d0': Directory not empty # mkdir d2 # # sys_rename m1/d1 d2 cannot rename `m1/d1' to `d2': Directory not empty # sys_rename m1/d1 d2 cannot rename `m1/d1' to `d2': Directory not empty # find . . ./d0 ./d2 ./m1 ./m1/d1 ./m1/d1/f0 ./.lustre # mkdir d3 # sys_rename m1/d1 d3 # find . . ./d0 ./d2 ./m1 ./d3 ./.lustre </pre> </div></div> 2.3.60-50-g75ae281 LU-2754

rename from MDT1 to MDT0 sometimes appears to succeed but does not

Technical task LU-1187 Blocker Resolved Fixed Di Wang John Hammond LB dne Tue, 5 Feb 2013 17:44:24 +0000 Tue, 23 Apr 2013 16:51:16 +0000 Tue, 12 Feb 2013 22:03:49 +0000 Lustre 2.4.0 Lustre 2.4.0 0 3 <p>This needs <a href="http://review.whamcloud.com/#change,5257" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/#change,5257</a> as well.</p> <p>John, note that by design, DNE Phase 1 does not support cross-MDT renames. It is supposed to return -EXDEV in this case and expects "mv" and similar tools to handle this by copying the file instead of doing a simple rename.</p> <p>That said, it definitely needs to be handled correctly even at the low level, and it looks like you've found a problem here.</p> <p>Indeed, I should have chosen a better title. Otherwise valid renames from MDT0 to MDT1 all returned -EXDEV as expected. But I never got -EXDEV renaming from MDT1 to MDT0.</p> <p>Would someone please explain what is the use case of 'lfs rm_entry'? I can't seem to find any mention of it in the DNE design documents I've found?</p> <p>lfs rm_entry is used to only deleting name_entry of the remote directory, i.e. the remote directory will become orphan. Usually this will be used to delete the name entry of remote directory, when some MDT is failed and can not go back, i.e. the administrator will use this command to delete the dangling name entry.</p> <p>Btw: I tried this with 5257. It seems the result is correct now.</p> <p><span class="error">&#91;root@testnode tests&#93;</span># ../utils/lfs getstripe -M /mnt/lustre/test1/f2<br/> 1<br/> <span class="error">&#91;root@testnode tests&#93;</span># ../utils/lfs getstripe -M /mnt/lustre/f3<br/> 0<br/> <span class="error">&#91;root@testnode tests&#93;</span># ../utils/lfs getstripe -M /mnt/lustre/test1/f2<br/> 1<br/> <span class="error">&#91;root@testnode tests&#93;</span># ./multiop /mnt/lustre/f3 N /mnt/lustre/test1/f2<br/> rename(): Invalid cross-device link</p> <p>I will add more test for this. Thanks.</p> <p>Thanks for the clarification. Can you also explain whey we have 'lfs mkdir' and 'lfs setdirstripe'? They seem to be the same thing. Is there a plan for their semantics to diverge at some point? </p> <p>I think "lfs mkdir" and "lfs setdirstripe" are aliases? I'm not sure i know what the distinction is myself. </p> <p>yes, lfs mkdir is the alias of "lfs setdirstripe -i" in phase I. Currently lfs setdirstripe only support -i now, and in DNE phase II, lfs setstripe will support stripe_count and pool as well.</p> <p>Fixed by Di's #5257.</p> Duplicate LU-2240 LU-2773 LU-2755 Development Rank 1|hzvim7: Rank (Obsolete) 6687