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Status Not under consideration
Workspace IBM Spectrum Virtualize / FlashSystem
Created by Guest
Created on Mar 30, 2012

RELATED IDEAS

SVC planned maintenance for vdisk mirror

My customer is planning to use SVC stretched cluster as a high available solution for the two data centers that are located close to each other (less than 1 km distance).
They are asking for a function to "suspend" the vdisk mirror on one side with a simple command, and resume the mirror later on.

Idea priority Urgent
  • Guest
    Reply
    |     Jun 12, 2015

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - Storage
    Product - IBM System Storage SAN Volume Controller (SVC) / Spectrum Virtualize

    For recording keeping, the previous attributes were:
    Brand - Tivoli
    Product family - Storage
    Product - IBM System Storage SAN Volume Controller (SVC) / Spectrum Virtualize

  • Guest
    Reply
    |     May 25, 2012

    We have had problems during the POC where the vdisk mirror made the SVC pause IOs for a long time, because it took too long to recognize that one Subsystem was undergoing maintenance.

    Currently there is no command to suspend the vdisk mirror, so that no disk smoothing and mirrorwritepriority timeouts will need to elapse before a copy is take offline. You can delete a copy, but that would require to re-sync all the data after the maintenance, so what they were asking for is a simply suspend command, which immediately marks one vdisk copy offline and the other one will be the working copy. If you run this command for all vdisks copies that are backed by the storage system that you are planning maintenance for, SVC will not need to pause IO when the write cache is full, and the de-stage operations has to time out (with disk smoothing 180 seconds) before he mdisk group is taken offline.

    An alternative would be to have a command to take a mdisk group offline, which would at the end result in the same result for the customer, but actually would be simpler to use.

    If you need any more information please send me an e-mail with your questions

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