Netgear ReadyNAS is about as reliable as a tabloid horoscope
Have had one of these in use exclusively as an iSCSI target since August 2009 and haven’t been that impressed with it. When it’s working, it works great, but I’ve had several firmware related problems with the device which have caused me to lose faith in it.
A couple of months ago, the ReadyNAS complained that two disks in the RAID array had failed simultaneously. My initial scepticism at the likelihood of this was borne out when Netgear support confirmed that the disks were fine, but a bug in the firmware had caused a false SMART detection which took the RAID array offline. The firmware upgrade supplied to fix this broke iSCSI when used with the Microsoft initiator. Netgear claimed that bug only affected the HP iSCSI initiator, but their workaround for HP worked for my Server 2008 R2 boxes, so I used that for 2 months until the next upgrade, which supposedly fixed the iSCSI.
That upgrade causes the box to lock up every 24-48 hours, and when it is up, iSCSI performance is frankly awful. I have no idea why this happens on my unit, as it doesn’t seem to be a widespread issue. Netgear support don’t know why either, and the kernel log on the ReadyNAS seems to overwrite itself every time you reboot the device, so there’s no way of determining what causes the lockup.
The only fix for this was to rollback to 4.2.9, complete with it’s semi-broken iSCSI support and earlier workaround. When this thing works it’s an absolute trooper, but in light of these problems I just can’t recommend a ReadyNAS for anything important. If you do buy one (a mistake I won’t be repeating), use it for non-critical systems only.