MirrorView Performance Question

I understand that but DR aside are there any performance problems replicating to a slower RAID type?

Hi Stu,

It is allowed to have any type of secondary image LUN - RAID type or number of disks. However, considering a DR scenario if you ever have to promote secondary image with different RAID Type or number of disks and the secondary image is significantly smaller then performance will suffer significantly. It is advisable to have the same configuration for RAID Group or Storage Pools on Source as well as  the Target Array.

MirrorView /S

Host will receive delayed the Acknowledgements depending on the RAID Type on the Target Array since it will be replicating before sending the Acknowledgement to the Host. So, Response time will be higher which will degrade the overall performance of the storage unit.

Yes - MirrorView Sync is sending every write to the mirror and the acknowledgement for the host will wait until the write to the mirror is committed and acknowledged back to the source LUN.

glen

For MirrorView/S, I think different RG type on target would affect the performance. For MiirorView/S, since the ACK is asynchronous so no impact on performance.

I think you meant,

For MirrorView/S, I think different RG type on target would affect the performance. For MiirorView/A, since the ACK is asynchronous so no impact on performance, right?

Anyhow, IMHO there will be performance hit irrespective of what type of Mirrorview you will be using on MV/S the performance degradation can be noticed while its syncing and in MV/A once, the image is promoted as a Primary the applications will suffer depending on the Raid Type configured. For Eg. You do not want to configure a MS Exchange LUN replication as MV/A, Primary in RAID 5 and secondary in RAID 1/0. If you ever have to promote Secondary Image as a Primary, expect IT Calls from users stating they are facing delay!

Wow, you're so thoughtful

Thank you!