IBM FlashSystem

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  • 1.  Policy Based HA and VmWare

    Posted 4 days ago

    We are in the process of migrating from a v5030 to a FlashSystem 5300. I'm the storage/linux administrator , so excuse my ignorance with vmware.

    We are using PBHA with the new FlashSystems, we have two, at release 8.7.3.3.  I was given this question by our vmware administrators:

    We aren't seeing the option to Enable "Clustered VMDK" on the new LUNS in vmware. Checked the requirements via the article below and doesn't look like WEAR reservations are supported. Is there a setting on your side that would need adjusting?

    Clustered vmdk datastore LUN support check

    Broadcom remove preview
    Clustered vmdk datastore LUN support check
    To check if a LUN meets these requirements, use vsish on the ESXi commandline: e.g. for device eui.xxxxxxxxxxxxxxxxxxxxxxxxxxxxx006 vsish -e get /storage/scsifw/devices/eui.xxxxxxxxxxxxxxxxxxxxxxxxxxxxx006/info vsish -e get /storage/scsifw/devices/eui.xxxxxxxxxxxxxxxxxxxxxxxxxxxxx006/info Sample output: Note for VAAI ATS status and is WEAR reservation supported? , a value of 1 => supported, value of 0 => unsupported
    View this on Broadcom >

    I'm assuming this may be because there are no clusters with PBHA at this time.

    If anyone has any thoughts on this, it would be greatly appreciated.

    Thanks,

    Eric



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    Eric Derr
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  • 2.  RE: Policy Based HA and VmWare

    Posted 3 days ago

    Hi Eric, 

    SCSI Persistent Reservations with policy-based high availability is supported in that code version so it's odd that it's showing as unsupported. 

    The Broadcom article you've linked to has three criteria:

    • Support SCSI-3 reservation type WEAR (i.e., write exclusive all registrant)
    • Support ATS commands
    • Have 512/512e sector size disks

    and all of these are supported in this code version with PBHA.

    Please open a support ticket so we can take a look at what's going on.

    Thanks,

    Chris



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    Chris Bulmer

    Software architect, IBM Storage Virtualize
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    Original Message


  • 3.  RE: Policy Based HA and VmWare

    Posted 4 hours ago

    Chris,

    Thank you for your reply. I have opened a case and will update the thread with their response.

    Eric



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    Eric Derr
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    Original Message


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