2013-08-19 12:18 AM
I am planning to migrate over 100 VMFS LUNs using Volume Snapmirror to DR site on a new netapp controller. Can someone
suggest on the best practices to be used for a consistent LUN.
I will be doing a Vol Snapmirror to move VMFS LUN, but need to check the steps with you all for successfull remapping of those VMFS LUNs
at the destination VC.
Secondly, I am using same Volume Snapmirror method to replicate SQL LUNs to DR site & map those LUNs using SnapDrive for Windows.
But while using Connect Disk inside SnapDrive at destination, its throwing error as "" Unable to find a Snapshot copy containing a consistent LUN to restore""
Can someone help me on these two things.
Solved! SEE THE SOLUTION
2013-08-19 03:42 AM
while using Connect Disk inside SnapDrive at destination, its throwing error as "" Unable to find a Snapshot copy containing a consistent LUN to restore""
I can pick this one up:
Connect Disk is meant to mount a LUN clone, so this is not for migration really. Once you've completed SnapMirror replication, break it, make destinations writeable & map LUNs to your hosts, rescan disks in Windows - SnapDrive should pick them up.
2013-08-26 12:29 AM
Thanks Radek for your inputs, but after couple of troubleshooting, I have got the solution for the second issue for inconsistent LUN copy.
My findings are :- When we replicate LUN to DR site using Snapmirror, & then try to mount to servers at DR site using SnapDrive for Windows, it would give us the above error as "" Unable to find a Snapshot copy containing a consistent LUN to restore"". Even if you do a Snapmirror Update, that also doesn't help.
Solution:- Once the LUN is Snapmirrored to DR site, first we need to use Update SnapMirror option available in SnapDrive, so that the final replication update is done using Snapdrive & thereafter you can connect that respective LUN to server using Snapdrive.
Steps:- Before Connecting Disk at DR site, select the said LUN & go to Actions --> Update SnapMirror. This option (Update SnapMirror) will not come, if you select a wrong LUN.
Once the update is done, then you try option Connect Disk, this worksssss..
However, I am still looking for steps for VMFS LUN replication, as I am getting Signature issues while adding the LUN to DR site VC. While using the option " Use the exisiting Signature", the LUN gets added easily to VC at DR site, but it doesn't get automatically added to all the servers in that Cluster. I need to manually add those LUNs to each server in Cluster individually. But this is tiresome, as I need to map all 30--40 LUns to all 16 servers in Cluster manually. I cannot use Resignaturing the LUNs, as that requires many more settings inside the individual VMs inside as well...
Any alternate or script or solution to this would be appreciated.