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You can also try recovery software. ReclaiMe is one package that some users here have used. But it runs on a PC, so you'd need to connect the drives to a PC (either with USB or sata).
It doesn't specificially say much about iSCSI, but it should still be helpful.
Since an iSCSI LUN is opaque block-storage to the NAS, incremental backups generally won't work from the NAS. If you need that you'll need to back them up from the client that mounts the iSCSI volume. The other incremental option is to use ReadyDR - that requires a second x86 ReadyNAS to be the backup destination.
You could try immediately powering down the NAS, connecting all the disks to a Windows PC, and then using a data recovery package like ReclaiMe. But the odds of success are very low.
As it is a LUN, recovery chances would be really low. You should power down nas asap (to stop any further writes) and contact a professional data recovery company.
You can also try recovery software. ReclaiMe is one package that some users here have used. But it runs on a PC, so you'd need to connect the drives to a PC (either with USB or sata).
I checked your profile and found that you have already contacted support. However, the ReadyNAS 4220 is not registered, there is no SN registered on your profile. I suggest you register the NAS with its SN at my.netgear.com first.
You do need to start with my.netgear.com. There isn't a specific category for data recovery (which I pointed out to Netgear). Maybe try the closest "get help with my netgear product" that you can.
