Chad Sakac – The Virtual Geek
Chad – you know he’s isn’t a virtual geek – he’s a real geek – nothing virtual about that! As an EMC-er Chad has been excellent in releasing docs on EMC issues generally and stuff on the whole VCE thang.
First up is a blog post which is as fresh as a daisy – from yesterday. It’s about FAST from EMC (yes, now one every comes up with acryonms that are S.L.O.W do they). What is FAST – well, its Storage VMotion done within the array between tiers of storage to improve performance. Think of it as DRS for storage. To learn more visit:
EMC FAST (the storage equivalent of VMware DRS) is GA…
Chad has some interesting clarification about vBlocks and some stuff on ionix as well
More VCE Vblock Details including EMC Ionix Unified Infrastructure Manager
Finally, Chad has flagged up two very important bugs and their work arounds. The first is about a performance dip when using the built-in multipath policy of “Round Robin” in vSphere4
vSphere 4 NMP RR IOoperationsLimit bug and workaround
and the second is this one – which concerns what happens if you just de-present a LUN without first doing the correct steps in vSphere first. Personally, I wouldn’t call this a bug per se – just unexpected behaviour when an admin does something without engaging brain first – hopefully the best practise is something folks do as naturally!
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December 9th, 2009 at 5:50 pm
What is the best practise way for de-presenting a LUN? Could you point me to it in the Docs so far haven’t ran across it?
Thanks,
Michael
December 9th, 2009 at 7:20 pm
You will find it on Chad’s site. But quickly summarize:
1. In the vSphere client, vacate the VMs from the datastore being removed (migrate or Storage vMotion)
2. In the vSphere client, remove the Datastore
3. In the vSphere client, remove the storage device
4. Only then, in your array management tool remove the LUN from the host.
5. In the vSphere client, rescan the bus.
December 9th, 2009 at 8:39 pm
Sorry Mike, ha ha I’m spamming you from all sides. Didn’t make the connection of the RTFM blog with your twitter account until just now. But I don’t have a remove option http://twitpic.com/stw6g
I’m not sure if my vcenter install is screwy or if they just removed the ‘feature’ of being able to remove a datastore. I see all over the place how to do it in esx 3.5 (and did it there myself in days past) it is just really strange (and a terrible bug when it all paths down on you for 10 seconds if you do it the ‘bad’ way)