<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Aug 31, 2024 at 5:13 PM Angelo M Ruggiero via Users <<a href="mailto:users@clusterlabs.org">users@clusterlabs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-6531680322473111159">
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Hi,</div>
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Thanks for the previous replies. I am currently reading them.</div>
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Can i be cheeky i have been researching and having some other "organisation issues" around fencing. </div>
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Maybe it is possible to recommend what fencing and whether to use sbd with just watchdog or also with storage. Or some pointers...</div>
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Here is my setup</div>
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2 Node, with a Quorum Device</div>
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nodes run on vmware and RHEL 8+ there is vmware watch available (i even tried it out a bit)</div>
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Each node is a different site, but they are close i.e approx 15 km with a good connection (i work for a big bank in switzerland)</div>
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Application DB Shared storage is given via nfs mounting and available on both side. The shared storage can be used at both sites. </div>
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We want to run SAP with HANA the above setup and using pacemaker there are some restrictions around sbd and vmware but lets put that to one side just from a view of pacemaker what option i choose i have to make sure it is SAP Certified... Oh joy. 🙂</div>
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I see the following main options</div>
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Option 1. Just fence_vmware with no sbd at all</div>
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Option 2. Fence_vmware with sbd but just watchdog</div>
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Option 3. Fence_vmware with sbd, watchdog and share storage </div>
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The organisational issue is that the sbd shared storage is considered non standard, although we are setting up Oracle RAC which needs similar setup.</div>
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What i read around at sort of think is good is option 3 as it provide posion pill, self fencing</div></div></div></blockquote><div><br></div><div>Which benefits are you expecting from poison pill fencing that make the hassle with the shared disk(s) worthwhile?</div><div>Where poison pill fencing is a no-brainer is usually pure 2-node setups but as you're having qdevice already ...</div><div>How would your shared disk setup look like? Going for a single disk at one site or for 3 disks at all 3 sites?</div><div>In case of a single disk having the site where that resides isolated would prevent resource recovery - usually</div><div>a nice option with sbd that you can recover from an isolated site.</div><div>When going for 3 disks you may not have that limitation. I don't know exactly for the external sbd fence-script but</div><div>when using fence_sbd you would have to use the most current upstream version (meanwhile already 2 years old)</div><div>otherwise fencing would fail if not all 3 disks are reachable.</div><div>When going with a single disk that is being made available via some mechanism that is invisible to sbd you</div><div>obviously have to investigate how that mechanism is working and how this is gonna impact timing. It is obvious</div><div>that you have to prevent a situation where one site can happily write to the shared disk while the other one is</div><div>seeing a replicated but disconnected (or slowly updated) version.</div><div><br></div><div>Not a complete and well structured consideration of pros and cons for all the options - but my 50ct for now ... </div><div><br></div><div>Regards,</div><div>Klaus </div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-6531680322473111159"><div dir="ltr">
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What i do not have clear in my head and what i will work on next week to work out the pros and cons and what situations can be handled.</div>
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I have discounted other fence agents as I am not sure they work on vmware, but happy to be told other options.</div>
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Any input gratefully received.</div>
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regards</div>
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Angelo</div>
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