Topic
  • 4 replies
  • Latest Post - ‏2015-03-30T10:04:40Z by chriscanto
janfrode
janfrode
17 Posts

Pinned topic Storwize v7000 global mirror with change volume

‏2013-01-08T11:12:05Z |
Could someone please confirm that what we're seeing is the expected behaviour when using Global Mirror with Change volume ?

On site 1 I have Vol1 in the "performance pool", and change volume Vol1-change in the "capacity pool". This is mirrored to site 2 with Vol1-site2 in the "capacity pool" and Vol1-change-site2 also in the "capacity pool" on site 2

In my "Running task" view I always see this remote copy operation listed as running with progress bar at 99%. Should it always be at 99%?

In copy-services -- FlashCopy Mappings I see

fcmap0 Vol1 -> Vol1-change with status "Stopped", progress 0%.
fcmap3 Vol1-change -> Vol1 with status "Idle", progress 0%.

This mapping from vol1-change tol vol1 looks very strange to me. Why is it mapping back to vol1?

It seems every now and then that the flash-copy for fcmap0 changes from "Stopped" to "Copying". Are there any logs I can monitor to see that how long it's taking for doing each snapshot + data mirroring to site2?

Also, our change volume has gotten quite big (500GB used, out of 2 TB volume). Is there an easy procedure for reducing this to a smaller size once we know that the cyclic changes should be much smaller ?
Updated on 2013-02-06T10:35:53Z at 2013-02-06T10:35:53Z by SystemAdmin
  • SystemAdmin
    SystemAdmin
    4779 Posts

    Re: Storwize v7000 global mirror with change volume

    ‏2013-01-28T11:24:05Z  
    I'm glad you posted this as I was also searching for the mystery around the task constantly running at 99%.

    Interestingly when I first setup the Global Mirror with CV I didn't have the task and my consistency group was showing "Consistent Copying". I decided to test a switch over on the volumes to confirm the data was OK (which it was!) but since switching back I now have this task running?! The fact that the consistency group is still showing "Consistent Copying" would suggest this is normal but I cannot find any official documentation to confirm this?

    I can confirm your FC mappings match mine.

    Can anyone shed any light on this, is this by design? If so why did I not have this task on initial setup?

    Thanks in advance.
  • SystemAdmin
    SystemAdmin
    4779 Posts

    Re: Storwize v7000 global mirror with change volume

    ‏2013-02-06T10:35:53Z  
    I'm glad you posted this as I was also searching for the mystery around the task constantly running at 99%.

    Interestingly when I first setup the Global Mirror with CV I didn't have the task and my consistency group was showing "Consistent Copying". I decided to test a switch over on the volumes to confirm the data was OK (which it was!) but since switching back I now have this task running?! The fact that the consistency group is still showing "Consistent Copying" would suggest this is normal but I cannot find any official documentation to confirm this?

    I can confirm your FC mappings match mine.

    Can anyone shed any light on this, is this by design? If so why did I not have this task on initial setup?

    Thanks in advance.
    After speaking to an IBM install engineer today I can confirm that having a constant Remote Copy operation for change volumes is completely normal.

    He couldn't explain why it wasn't there at first, but I'm just happy to know that it is functioning as expected!
  • LeonelSAA
    LeonelSAA
    19 Posts

    Re: Storwize v7000 global mirror with change volume

    ‏2015-03-30T07:41:21Z  
    After speaking to an IBM install engineer today I can confirm that having a constant Remote Copy operation for change volumes is completely normal.

    He couldn't explain why it wasn't there at first, but I'm just happy to know that it is functioning as expected!

    Hello everyone,

     

    could someone help me at, what is happen with the storwize V7000, because unexpected since March 23, 2015 aren't updating freeze time as can see in image attached and on the running task does not showing remotecopy operation.

    Can anybody help me to solve it to normal operation?

     

  • chriscanto
    chriscanto
    283 Posts

    Re: Storwize v7000 global mirror with change volume

    ‏2015-03-30T10:04:40Z  
    • LeonelSAA
    • ‏2015-03-30T07:41:21Z

    Hello everyone,

     

    could someone help me at, what is happen with the storwize V7000, because unexpected since March 23, 2015 aren't updating freeze time as can see in image attached and on the running task does not showing remotecopy operation.

    Can anybody help me to solve it to normal operation?

     

    There was a bug in downlevel code versions that could cause the freeze time to not be updated if the user-specified cycle period is set to less time than it takes to perform a cycle.  For example, if you had a 1 hour cycle period configured on the relationship/group but it was currently taking more than an hour to copy the differences from the last cycle.

    You could try this out for yourself by setting a longer cycle period and see if the freeze time then updates between cycles.

    ftp://index.storsys.ibm.com/san/sanvc/release_notes/740_releasenotes.html

    APAR HU00467 - "Global Mirror Change Volumes Freeze time not reported correctly if cycle takes longer than the cycle period to complete"

    If it is that bug then the replication will still be working properly, so the data will still be being copied to the secondary volumes; it is just the freeze time that isn't being updated.

    If in doubt then contact IBM Support.