ESXi

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  • 1.  Expand datastore on diffrent raid configuration

    Posted Aug 08, 2018 03:24 PM

    Hello Community,

    We are trying to expand a VMFS datastore on an ESXI 6. the configuration is the following:

    1st Datastore : 6 Disk of 2TB with Raid 5 configuration

    Just Added 2 Disk of 2TB with raid 0/raid 1

    My question to the community is the following:

    If I expand the 1st datastore to use  the availiable disk space while the raid configuration is diffrent. Would this make a performance/consistancy issue ?

    Thanks for the help.



  • 2.  RE: Expand datastore on diffrent raid configuration

    Posted Aug 08, 2018 04:04 PM

    I've always extended the LUNs to increase the datastore capacity. It would have been easier, IF your SAN could get the additional drives added to the RAID 5 volume, then expand the RAID and related LUN setup. Then you could simply do a scan of the datasore/HBA and then expand the datastore to use more of what's presented.



  • 3.  RE: Expand datastore on diffrent raid configuration
    Best Answer

    Posted Aug 08, 2018 05:04 PM

    I agree with golddiggie​, expand the existing RAID set/logical volume if possible, rather than adding an extend with a different RAID level.

    Although such a configuration will likely work, it may cause performance issues, similar to mixing LUNs with different tiers.

    From https://kb.vmware.com/s/article/2000643

    Mixing LUNs with different speeds can affect the performance of your extended VMFS. Therefore, it is better to have all extents presented from the same storage array.

    André