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8 Krypton

Reclaim of a thin LUN

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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

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8 Krypton

Re: Reclaim of a thin LUN

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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."

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8 Krypton

Re: Reclaim of a thin LUN

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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."

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8 Krypton

Re: Reclaim of a thin LUN

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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

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8 Krypton

Re: Reclaim of a thin LUN

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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.

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8 Krypton

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

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8 Krypton

Re: Reclaim of a thin LUN

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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 <emc-community-network@emc.com>

01/09/2013 02:46 AM

Please respond to

jive-1551714427-8lx6-2-f1s7@community.emc.com

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Sreehari Karanam/UK/GTS/PwC@EMEA-UK

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Re: Reclaim of a thin LUN

created by Saurabh Rohilla in Symmetrix Support Forum - View the full

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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

ECN

Start a new discussion in Symmetrix Support Forum by email or at ECN

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nemanis
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Re: Reclaim of a thin LUN

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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.

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nemanis
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Re: Reclaim of a thin LUN

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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

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8 Krypton

Re: Reclaim of a thin LUN

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SE 7.4 supports pre 5876 code also. Do you wanted to say that 5876 code is only supported by SE 7.4?

nemanis wrote:

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.

regards,

Saurabh

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nemanis
1 Copper

Re: Reclaim of a thin LUN

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yes 5876 supported only by 7.4

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