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Ask the Expert: Top Tips & Tricks to Rock Your XtremIO World
Welcome to an all new
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Ask the Experts: EMC Isilon technical content and documentation Ask the Expert: Best Practices – 7.x Installation and Upgrade |
EMC Community Network Ask the Expert conversation. For two weeks, beginning July 20th, our panel will show you how to make the most of your XtremIO system. Our panel of technical experts will share best practices of configuration, operation and management, and will be here to answer your specific questions. To get started, check out the Top 10 Tips & Tricks for XtremIO document that we featured at EMC World.
Meet Your Experts:
Twitter: @jamesrthrone |
Director, Global Systems Engineering - EMC Jim is an IT Professional for over 20 years, including 15 at EMC. Strong background in UNIX system administration and NAS. Currently based in Michigan. |
Twitter: @johnvarghese |
Global Systems Engineer - EMC John prior to EMC was with NetApp for 6 years functioning as a Principal Solutions Architect focused on design and implementation of the the full NetApp solution stack supporting various applications such as Oracle, Vmware, and Microsoft. Previously, he was with a Reseller for 3 years supporting a multitude of storage and backup products including EMC, HP, Hitachi, Commvault and Netbackup. |
Twitter: @Denypatel |
Global SE - EMC Deny joined the EMC team with over 15 years of experience in Cloud Computing, Virtualization, Storage and Networking in wide variety of Pre-Sales and Engineering roles. Most recently he was with Nimble storage where he served as an Escalation Engineer helping high profile accounts resolve performance problems that were introduced by poor VDI, Network and Virtualized designed environments. |
This discussion takes place from July 20th - August 1st August 7th. Get ready by bookmarking this page or signing up for e-mail notifications.
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dynamox
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July 29th, 2015 17:00
how do i get WWPN for the LUN ? So far the only option that worked is port WWN and then LUN mapping ID.
Thanks
Kumar_A
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July 30th, 2015 07:00
LUN WWPN Is the 32 digit hex number that you see in the show-volumes CLI output. This is the same thing that you had mentioned earlier in this discussion.
dynamox
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July 30th, 2015 08:00
Avi,
i don't see 32 digit hex number in show-volumes output, i only see 16 digits. Look back at the output i provided earlier.
Kumar_A
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July 30th, 2015 14:00
My bad – it is a 16 digit hex number.
Kumar_A
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July 30th, 2015 14:00
Thank for sharing the screenshots…this is awesome!
dynamox
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July 30th, 2015 14:00
SANCopy does not like 16 digit numbers
Kumar_A
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July 30th, 2015 14:00
This was a change done in 4.0 release to avoid the LUN 0 / LUN Z issue.
dynamox
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July 30th, 2015 14:00
XtremIO panel,
why is volume mapping defaults to mapping the first volume at 1 and not 0 ? I can go in and manually change it to 0 but what was the reasoning behind that ?
dynamox
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July 30th, 2015 14:00
sdelete -z helps
Screenshot on the left is sancopy before sdelete, screenshot on the right is sancopy after sdelete. Volumes were deleted and recreated between tests. Tomorrow i am testing the same thing on Linux.
dynamox
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July 30th, 2015 14:00
LUN Z is only an issue if you do not have have anything at "host id" 0. But on XtremIO you are intentionally skipping 0 ..i don't understand ?
Scooba1
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July 30th, 2015 19:00
If you zone, then scan before provisioning a LUN, the host will see LUNZ at HLU0. This can cause issues if you then try and present a new LUN on HLU0 (I have seen this with ESX).
If you provision a LUN to HLU0 first, then it won't be a problem. However, simply skipping HLU0 prevents this issue.
dynamox
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July 30th, 2015 20:00
it's just odd not to start with HLU 0, i go back to FC4700 where you always start with HLU 0.
dynamox
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July 30th, 2015 20:00
i am familiar with LUNZ issues, as soon as HLU 0 is populated with a LUN, LUNZ is gone and replaced by the actual LUN. I don't understand how skipping HLU0 prevents that from happening ?
Kumar_A
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July 30th, 2015 20:00
In some operating systems, we found that if there is a LUN Z to start with; presenting a LUN with HLU 0 at that point resulted in some unexpected "issues”. Other HLU numbers can be presented without any problem.
Not presenting HLU 0 through XtremIO therefore avoids this potential problem. Is there any specific reason why you want to present HLU 0 from XtremIO?
Scooba1
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July 30th, 2015 21:00
As you mentioned you still can use HLU0 by setting it manually. Some operating systems will require you to remove the record for LUNZ on HLU0 before you can rescan the new LUN on HLU0.