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<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Hi all,</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Need a small guidance on pacemaker: 1.1.23.</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
I'm chasing a stubborn issue in a 2node 2disc SBD cluster.</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
<br>
</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
When running manual fencing test with `pcs stonith fence` command, I observe an error</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
```</div>
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Error: unable to fence '<nodehostname>'</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
```</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Error manifests each time around a `20second` timeout(I assume this is a timeout).</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
`time` command is used to track how long execution runs: `time pcs stonith fence`.</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Here is an example:</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
```</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
[root@node1 ~]# time pcs stonith fence --debug node2</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Running: /usr/sbin/stonith_admin -B node2</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
> Return Value: 194</div>
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--Debug Output Start--</div>
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--Debug Output End--</div>
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<br>
</div>
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Error: unable to fence 'node2'</div>
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<br>
</div>
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> real 0m20.791s</div>
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user 0m0.063s</div>
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sys 0m0.033s</div>
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[root@node1 ~]#</div>
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```</div>
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<br>
</div>
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For investigation, I've setup a testing cluster with 2 Virtualbox VMs.</div>
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Behaviour was NOT observed on testing cluster until I intentionally added disk write delays with dmsetup tool on one of the nodes.</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Here is an example of setting a 22sec write delay:</div>
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```</div>
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# Create: read delay = 0 ms, write delay = 22000 ms</div>
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# Table format: delay <dev> <start> <read_ms> <dev> <start> <write_ms></div>
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dmsetup --noudevsync create slow-sdc --table "0 ${SIZE} delay /dev/sdc 0 0 /dev/sdc 0 22000"</div>
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dmsetup mknodes</div>
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```</div>
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<br>
</div>
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NOTE, that tests with delays upto(including) 19sec pass:</div>
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```</div>
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[root@node1 ~]# ./suspend-resume-slow-sdc-delay-write.sh 20000</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
[root@node1 ~]# dmsetup table slow-sdc</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
> 0 262144 delay 8:32 0 0 8:32 0 20000</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
[root@node1 ~]# time pcs stonith fence --debug node2</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Running: /usr/sbin/stonith_admin -B node2</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Return Value: 194</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
--Debug Output Start--</div>
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--Debug Output End--</div>
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<br>
</div>
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```</div>
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> Error: unable to fence 'node2'</div>
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<br>
</div>
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> real 0m20.588s</div>
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user 0m0.088s</div>
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sys 0m0.021s</div>
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<br>
</div>
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> [root@node1 ~]# ./suspend-resume-slow-sdc-delay-write.sh 19000</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
++ blockdev --getsize /dev/sdc</div>
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+ SIZE=262144</div>
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++ lsblk -dn -o MAJ:MIN /dev/sdc</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
+ MAJMIN=' 8:32 '</div>
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+ dmsetup suspend slow-sdc</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
+ dmsetup reload slow-sdc --table '0 262144 delay /dev/sdc 0 0 /dev/sdc 0 19000'</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
+ dmsetup resume slow-sdc</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
+ dmsetup table slow-sdc</div>
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> 0 262144 delay 8:32 0 0 8:32 0 19000</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
[root@node1 ~]# pcs stonith history cleanup; pcs stonith cleanup # pcs-cleanup-error-cleanup</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
cleaning up fencing-history for node *</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
<br>
</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Cleaned up all resources on all nodes</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
[root@node1 ~]#</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
[root@node1 ~]# time pcs stonith fence --debug node2</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Running: /usr/sbin/stonith_admin -B node2</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Return Value: 0</div>
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--Debug Output Start--</div>
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--Debug Output End--</div>
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<br>
</div>
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> Node: node2 fenced</div>
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<br>
</div>
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> real 0m19.869s</div>
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user 0m0.098s</div>
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sys 0m0.035s</div>
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[root@node1 ~]#</div>
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```</div>
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<br>
</div>
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So here is my question:</div>
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I assume there is a 20sec timeout value hardcoded somewhere in pacemaker 1.1.23 sources.</div>
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This hardcoded value impacts manual fencing in case of disc I/O delays(maybe in some other cases).</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
I expect that increasing timeout can mitigate clusters with disc I/O issues similar to ones described above.</div>
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Please note this timeout is NOT: stonith-timeout or stonith-watchdog-timeout.</div>
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<br>
</div>
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Could you please comment if that is a meaningfull assumption and where does the 20sec timeout come from.</div>
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<br>
</div>
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Regards, Dmytro</div>
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