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-863 Lustre <p>we have an customer who are now using lustre-1.8.3.ddn3.3.<br/> A single user on single client writes many files (100K files, file size average 600KB) and read them by same user on same client. <br/> When that user read thease files, he can't read some files and returned "no such or directry". Howerver, if same user reads these files on other clients, he can read them.</p> <p>There are following error messages on MDS when the problem happened.<br/> Nov 3 06:08:19 md1 kernel: LustreError: 9406:0:(upcall_cache.c:342:upcall_cache_get_entry()) acquire timeout exceeded for key 1104</p> <p>could you pleaes have a look at the log files and find out whether this is known issue on 1.8.3 or not?</p> <p>Thanks</p> LU-863

(upcall_cache.c:342:upcall_cache_get_entry()) acquire timeout exceeded for key 1104

Bug Minor Resolved Fixed Johann Lombardi Shuichi Ihara Fri, 18 Nov 2011 10:09:53 +0000 Thu, 15 Dec 2011 20:44:17 +0000 Thu, 15 Dec 2011 20:44:17 +0000 0 3 <p>/var/log/messages</p> <p>Hi Ihara,</p> <p>Is this customer using LDAP or NIS?</p> <p>Johann,<br/> The customer is using NIS.</p> <p>The default group upcall timeout is 15s, so it means that NIS can sometimes take more than 15s to answer to the request.<br/> What you can do is to increase the acquire timeout (i.e. group_acquire_expire) as well as how often we refresh the group information (i.e. group_expire_interval set to 10 mins by default).<br/> I would also recommend to check if anything can be done to make NIS more responsive on the MDS since it hurts lustre (requests processing is stuck until NIS replies). </p> <p>ok, we do suggest incresing group_acquire_expire to 600, then run program again to see if the problem goes away. </p> <p>Ihara</p> <p>Can this ticket be closed?</p> <p>Peter</p> <p>Peter,</p> <p>Yes, the customer did increasing group_acquire_expire to 600, after that they have bee seeing same error messages so far.<br/> So, please close this ticket.</p> <p>Thank you.</p> <p>Ihara</p> <p>Thanks Ihara!</p> Development Rank 1|hzvhpr: Rank (Obsolete) 6519 Severity