We just got a 2040 ( 12 x 450Gb SAS) with a half populated DS4244 ( 12 x 1Gb SATA ) and I'm looking at the best way to config it all and wanted to ask your opion's.
The SAS drives will be used purely in our Xen infrastruction ( 2 x Sen server's connecting via iSCSI ) and the SATA will be CIFS shares. We want to keep redundancy across the two heads but we also want as much storage as possible.
the DS shelf isn't attached yet ( should be a week or so ) and at the moment we have 6 disks on one head, and 6 disks on another. Both sets of 6 disks are setup using Raid DP. this is ok, and I can see the great redundancy we get from this, but we don't end up with all that much storage and I wondered what other option's are availble or that you guys could recomment please.
I think you can have one head own the 12 SAS drives and create a 12-disk RAID-DP group. Let the other head own the 12 SATA drives. As long as the pair of heads are configured active/active, you should have the controller redundancy.
- then any data from SAS disks owned by Head 2 needs to me migrated off before destroying aggregate, changing disk ownership & attaching them to aggregate on Head 1. This may mean two-hop exercise if there isn't enough capacity under Head 1 (temporary migration to SATA, expanding SAS aggregate, migrating to expanded SAS aggregate)