RDM in SRM 5.0

[malarshyam]

Hi,

I was running a recovery plan with a datastore of 8 TB with 3 extents, this particular plan was failing and VM ware said they are having an issue with extents.

I now have a doubt can we use RDM for the storage and does it cause any issues in this regards, waht is the maxium size of an RDM we can use.

Thanks

Malar

[mal_michael · Accepted solution]

Hi,

If you upgrade to vSphere 5 (ESXi5 + VMFS5), the limits are as follows:

Volume size: 64TB
Raw Device Mapping size (virtual compatibility): 2TB minus 512 bytes
Raw Device Mapping size (physical compatibility): 64TB
File size: 2TB minus 512 bytes

Michael.

[malarshyam]

Hi Michael,

At present we are using ESX 4.1 and SRM 5.0.

In case of a DR have an extent is a problem because in the recovery site SRM is not able to amount the extents, as the ESX is not abel to authenticate teh LUN signature. VMware support has confirmed this issue.

Do you have a work around for this? Else if I use RDM will it create any issues in the SRM.

Thanks

Malar

[mal_michael]

I haven't heard about the extents issue before. AFAIK SRM should work with extents as mentioned in admin guide.

Regarding RDMs, I am not aware of specific issues with SRM and RDMs. Seen it in couple of environments working fine.

In some SRAs special configurations are required to work with RDMs. Review your SRA documentation.

Michael.