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Status Not under consideration
Workspace IBM DS8000
Created by Guest
Created on Aug 20, 2018

RELATED IDEAS

DS8k Metadata volume

On 8/3/2018 the HPFE in our DS8886 lost two drives at the same time, in the same rank. To recover we had to delete the entire storage pool because there is a volume of meta data for each storage pool, and that pool happened to land it on the failing rank. I would like to ask that some failure resiliency be added so in similar circumstances only the rank would have to be rebuilt. This resulted in a Sev 1 PMR. IBM support closed IBM Problem # BNHDNZM and opened a Sev 1 for us.

Idea priority Medium
  • Guest
    Reply
    |     Aug 29, 2018

    The DS8000 backend storage design point is that a storage pool should be considered as a failure domain. Volumes and metadata are all striped over the arrays in a pool so in the event of a catastrophic failure of an array it is expected that parts of all volumes in the pool would be affected by this failure. With large extents and small volumes it is possible that some volumes may not be present on all arrays but with larger (M54 and EAV) volumes and especially with small extents it is almost 100% guaranteed that every volume in a pool will be impacted. Whether or not the metadata within the pool is treated differently from the volume data will not affect this behavior.
    To improve the resilience of the backend storage RAID6 is now the recommended array type and for the highest levels of availability to use Metro Mirror and HyperSwap. If multiple failure domains are desired for isolation then multiple storage pools can be created.

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