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2101
Reclaim of a thin LUN
Hi All,
Is there a specific reason that a LUN that is replicated can't be reclaimed with the SRDF still active? Are there no patches or enginuity fixes, available with the latest releases of the Enginuity to prevent the SRDF from being suspended while trying to reclaim the space on the LUN?
Also, is there a way to remove the persistent allocation on a thin device, non-disruptively? Being a device level setting, there should have been some way to reset this tag, but did not find that.
Please suggest..
Thanks,
SreeHari
AranH1
2.2K Posts
0
December 27th, 2012 10:00
SreeHari,
At this time reclaim of zero extents while SRDF replication is active is not supported at any Enginuity or Solutions Enabler level.
You can perform reclaim of persistent allocations if you add the persistent qualifier to the 'start reclaim' command.
You can also remove the persistent attribute by using the 'symdev unset -persistent' option.
See the primus articles below on restirctions of reclaim:
emc301329
"Solutions Enabler: Error while running the StorReclaim utility "No thin device is associated with such volume""
emc231508
"No space is reclaimed against R1 device when the RDF link is in an Established state."
Sreehari_PwC_UK
31 Posts
0
January 7th, 2013 02:00
Hi Aran,
Thanks for the answer, but now, the symdev command is not working on SE 7.4 and when asked with EMC support, they say that either the SE version needs to be downgraded to SE 7.3 or the enginuity needs to be upgraded to 5876 (we are currently at 5875 with SE 7.4 and it is claimed that this combination does not support the command). Is there any other way to get past this?
We are not okay with either the downgrade (of SE) or upgrade (of microcode).
Thanks,
SreeHari
AranH1
2.2K Posts
0
January 7th, 2013 09:00
I am not sure why support is making that statement. There could be something about the particular version of 5875 or SE that is the source of their statement.
I do know that Enginuit 5875 is supported using Solutions Enabler 7.4 and in particular the 'start reclaim' command. If you look in the 'Solutions Enabler Array Controls Product Guide 7.4' you will see in the 'Configuration Operations Supported' table (page 28 in the version I am looking at) that the command is supported with 5874, 5875, and 5876.
sauravrohilla
859 Posts
0
January 8th, 2013 18:00
Agree with AranH.
Sreehari, could you please share the primus number which support might have given you to backup their suggestion?
regards,
Saurabh
Sreehari_PwC_UK
31 Posts
0
January 9th, 2013 01:00
I don't really remember EMC quoting any primus solution. They just said
so.
Thanks,
SreeHari Karanam
PwC | Storage Administrator
Telephone: +91 080 67241963
Email: sreehari.x.karanam@uk.pwc.com
Saurabh Rohilla
01/09/2013 02:46 AM
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Re: Reclaim of a thin LUN
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Agree with AranH.
Sreehari, could you please share the primus number which support might
have given you to backup their suggestion?
regards,
Saurabh
Reply to this message by replying to this email -or- go to the message on
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nemanis
3 Posts
0
January 9th, 2013 10:00
Srihari , for Zero reclaim of R1 devices ,only way is to suspend the SRDF links and run the zero reclaim on the R1 devices.
However if the SRDF session is in ACP mode zeroes are detected and not replicated to R2. If not Zero reclaim had to be seperately carried out on R2 devices also.
SRDF acpmode is the only mode which recognizes zeroes and will not replicate to R2
nemanis
3 Posts
0
January 9th, 2013 10:00
SE 7.4 is only supported with Microcode 5876.So SE downgrade or Microcode upgrade is the only option.Also if you want to upgrade to 5876 pls also install the hotfixes available for 7.4.There are few major bugs reported with the base version 7.4.
sauravrohilla
859 Posts
0
January 9th, 2013 17:00
SE 7.4 supports pre 5876 code also. Do you wanted to say that 5876 code is only supported by SE 7.4?
regards,
Saurabh
nemanis
3 Posts
0
January 11th, 2013 14:00
yes 5876 supported only by 7.4