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Go to SolutionMigrating a LUN
I'm looking to migrate an existing 250 GB LUN, comprised of ATA disks to a 450 GB LUN, also comprised of ATA disks. I looked at some articles in Powerlink, and it seems like a pretty easy, pretty straightforward process. Any big "gotcha's" I need to watch out for? I believe I read that once the migration is completed, that the NEW LUN will assume the WWN of the older LUN, and the older LUN will be destroyed. Should I assume this to also mean that the new 450 GB LUN will automatically be added to the Host server that the older 250 GB LUN resided on? What about shares? Do the shares and permissions currently in place also get migrated? I also recall reading something that stated that this whole migration process could be done during business hours and would be invisible to the end users. Is this true? I'm just trying to make sure that migrating from a 250 GB LUN to a 450 GB LUN will be as easy as I've read that it'll be.
Thank you in advance
Thank you in advance
577
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Posted July 24th, 2008 08:00
You are sooo good577
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Posted July 24th, 2008 08:00
Maybe I should give it a try. It's like manuals: ieeeeeeeeeeeeee.....577
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Posted July 24th, 2008 08:00
That hand dandy search bar actually works577
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Posted July 24th, 2008 08:00
The name of the document that RRR was thinking of is:
The Influence of Priorities on CLARiiON LUN Management Operations - Applied Technology
It is located at:
Support > Technical Documentation and Advisories > Hardware/Platforms Documentation > CLARiiON CX3 UltraScale Series Systems > CLARiiON CX3-80 > White Papers
And yes it can be done during business hours. I have migrated production LUNs during business hours many times. Just be very careful on the migration setting used. ASAP will definitely impact your array, so if there is not an immediate need for the storage I recommend a Medium setting for the migration. But read the white paper, it will explain it all in detail.
Aran577
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Posted July 24th, 2008 08:00
To RRR and Aran H:
Thank you both for the quick replies. This is not a VMware box, so should be pretty smooth. Thanks again for all the help!
-Jonathan577
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Posted July 24th, 2008 09:00
I am ashamed to admit I actually have to read the manual sometimes ...
I know I just lost geek points, but it is true....577
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Posted July 25th, 2008 04:00
LOL577
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Posted July 25th, 2008 04:00
Please mark correct and helpful answers in this thread. It helps future readers to identify the good posts.158
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Posted July 29th, 2008 08:00
JD44,
The site can be a little flaky sometimes. No need to apologize, even on vacation Rob is still a point fiend
What migration setting were you using? The fact that it was taking so long sounds like a Low setting which should have no noticeable impact on performance.
Aran
RRR
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577
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Posted July 24th, 2008 08:00
BUT: the host's OS needs to be capable of handling a suddenly larger LUN.
If your host is Windows 2k3 or something and your 250GB LUN is a basic disk, extending the partition afterwards is an online action. If your host is ESX for example, you need to consider that VMFS cannot be extended on the same LUN and you need to create extends ... or something... I'm not a VMware guru.
About shares: whatever is on the LUN, cannot be read by the Clariion, so shares and everything will stay in place.... no worries there
So yes: migrating can be done online
There is a speed setting: low, medium, high and ASAP. ASAP moves really fast, but has an impact on your environment, the other 3 settings are somewhat slower (high is something like 10GB/hour and the other 2 are even slower). There is a document out about the performance impact on a variety of migratiuon settings. I'm so bad with names, I forgot the name of this document of course....