A MDS node randomly running out of memory and hang.
We watch MDS drain its memory in matter of few minutes. Many times right after recovery from previous hangs.
Clients are generating a ton of Lustre errors with strings "ptlrpc_expire_one_request". The numbers are from several hundred thousands to several millions of such errors from each node. Here are number of error counts from some nodes:
Yes, I do not know the exact reason why for this 8192_size slab caused so much memory here. No, I do not think this is related with any default setting. Did you do a lot cross-MDT operation here, like creating remote directory or striped directory? (unfortunately, there are not enough stack trace information here) Btw: this stack trace is collected when OOM happens ? or before? or about to happen? Right now, I would suggest
1. Use 2.7.58 plus that patch (http://review.whamcloud.com/#/c/14926/) you need, maybe also include http://review.whamcloud.com/#/c/16161/.
2. Please add "log_bf_len=10M" in your boot command, so we can see more of the stack trace when error happens.
3. Please help me find an easy way to reproduce the problem. Thanks!
Even though 2.7.58 might not help you on this issue, but it is way better than 2.7.51 on DNE.
Di Wang
added a comment - Hello, Haisong
Yes, I do not know the exact reason why for this 8192_size slab caused so much memory here. No, I do not think this is related with any default setting. Did you do a lot cross-MDT operation here, like creating remote directory or striped directory? (unfortunately, there are not enough stack trace information here) Btw: this stack trace is collected when OOM happens ? or before? or about to happen? Right now, I would suggest
1. Use 2.7.58 plus that patch ( http://review.whamcloud.com/#/c/14926/ ) you need, maybe also include http://review.whamcloud.com/#/c/16161/ .
2. Please add "log_bf_len=10M" in your boot command, so we can see more of the stack trace when error happens.
3. Please help me find an easy way to reproduce the problem. Thanks!
Even though 2.7.58 might not help you on this issue, but it is way better than 2.7.51 on DNE.
You stated that 2.7.58 has a lot fixes. But it may still not fix our problem, correct?
Can you elaborate on slab situation? You indicated 941G (or 94G) was too big, why is it? Is it because of default setting or some configuration mistake?
thanks,
Haisong
Haisong Cai (Inactive)
added a comment -
Hi WangDi,
You stated that 2.7.58 has a lot fixes. But it may still not fix our problem, correct?
Can you elaborate on slab situation? You indicated 941G (or 94G) was too big, why is it? Is it because of default setting or some configuration mistake?
thanks,
Haisong
I understand LU-6584 is a different problem, for OSS and not MDS memory issue.
What I said earlier was, to work on LU-6584 problem, we have to apply a patch soon. This is because they are the same
file-system. That patch is built with http://review.whamcloud.com/#/c/14926/
Was that 2.7.58 equivalent?
Haisong
Haisong Cai (Inactive)
added a comment -
Hi Wang Di,
I understand LU-6584 is a different problem, for OSS and not MDS memory issue.
What I said earlier was, to work on LU-6584 problem, we have to apply a patch soon. This is because they are the same
file-system. That patch is built with http://review.whamcloud.com/#/c/14926/
Was that 2.7.58 equivalent?
Haisong
Hmm, I think LU-6584 is different issue. This ticket is about MDS OOM during failover? Do you happen to know any easy way to reproduce this problem?
Hmm, btw: is that possible you can add "log_buf_len=10M" in your boot command? since the dmesg you post here only have half stack trace. Thanks.
Di Wang
added a comment - Hmm, I think LU-6584 is different issue. This ticket is about MDS OOM during failover? Do you happen to know any easy way to reproduce this problem?
Hmm, btw: is that possible you can add "log_buf_len=10M" in your boot command? since the dmesg you post here only have half stack trace. Thanks.
Haisong Cai (Inactive)
added a comment -
LU-6584 is about OSS crashing problem. The OSS servers are part of these very same MDS servers. They are the one file-system.
We are about to apply a new patch related to LU-6584 . It is built from http://review.whamcloud.com/#/c/14926/
Will it be satisfy your recommendation?
Haisong
Is that possible you can upgrade MDS to 2.7.58 ? there are quite a few fix on these area since 2.7.51.
Btw: we are currently testing ZFS on DNE at LU-7009, please follow there.
Di Wang
added a comment - Is that possible you can upgrade MDS to 2.7.58 ? there are quite a few fix on these area since 2.7.51.
Btw: we are currently testing ZFS on DNE at LU-7009 , please follow there.
We are running CentOS 6.6 with Linux kernel 3.10.73 from elrepo.
Lustre and ZFS are build as kdms modules.
Filesystem has 16 OSS and each has 6 OSTs.
Haisong
Haisong Cai (Inactive)
added a comment -
Hi WangDi,
We are running CentOS 6.6 with Linux kernel 3.10.73 from elrepo.
Lustre and ZFS are build as kdms modules.
Filesystem has 16 OSS and each has 6 OSTs.
Haisong
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Lai Siyao
Haisong Cai (Inactive)
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\n","validSearcher":true,"isShown":true},"labels":{"name":"Label","viewHtml":" <div class=\"searcherValue\">\n \n <label class=\"fieldLabel\" for=\"fieldlabels\">Label:</label><span id=\"fieldlabels\" class=\"fieldValue\">\n \n sdsc\n</span></div>\n","editHtml":"\n <div class=\"field-group aui-field-labels\" >\n <label for=\"searcher-labels\">Labels</label> <select class=\"js-label-checkboxmultiselect\" multiple=\"multiple\" id=\"searcher-labels\" name=\"labels\" data-placeholder-text=\"Find Labels...\">\n <option value=\"sdsc\" title=\"sdsc\" selected=\"selected\">sdsc</option>\n </select>\n </div>\n \n","jql":"labels = sdsc","validSearcher":true,"isShown":true}}}
[{"id":-1,"name":"My open issues","jql":"assignee = currentUser() AND resolution = Unresolved order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":true},{"id":-2,"name":"Reported by me","jql":"reporter = currentUser() order by created DESC","isSystem":true,"sharePermissions":[],"requiresLogin":true},{"id":-4,"name":"All issues","jql":"order by created DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-5,"name":"Open issues","jql":"resolution = Unresolved order by priority DESC,updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-9,"name":"Done issues","jql":"statusCategory = Done order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-3,"name":"Viewed recently","jql":"issuekey in issueHistory() order by lastViewed DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-6,"name":"Created recently","jql":"created >= -1w order by created DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-7,"name":"Resolved recently","jql":"resolutiondate >= -1w order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-8,"name":"Updated recently","jql":"updated >= -1w order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false}]
SDSC have moved onto more current releases so I do not think any further work is needed here