I'm contemplating getting the DX510 to be used as a backup and not as an expansion per-se. I'm using one volume on the DS1010+ (formatted as RAID6, storage purposes only, no backup) as an iSCSI target on my computer (client). What I'd like to do is create another iSCSI target from the volume on the DSX510 (formatted as RAID5 or RAID0, depending). The purpose is that the DX iSCSI will then back up the DS1010+ iSCSI (and the cloud will back up the content in the DX iSCSI). Why so complicated? I'm an all-Mac based environment, and I want to preserve HSF+ formatting.
It sounds do-able. Will this setup work? No one has confirmed, but it seems plausible.
If so, in this scenario, what are the ramifications if either or both the DS1010+ and DX510 crash in regards to data loss? Again, no confirmation, but I'd guess that because the DX510 is an expansion unit plugged into the DS100+, that it would be taken offline (if it's a separate volume, and not part of the RAID if you've combined the DS1010+ and DX510 drives in the same RAID) until the DS1010+ is repaired. If the DX510 crashes, then you'd either have to repair/rebuild it's array (whether as its own volume, or as an expansion). Data loss is dependent on RAID redundancy. Always have a backup!
Synology DS1010+ | 3.0 | 5x2TB WD20EARS | RAID6 | Mac OS X 10.6.4