We have a few Netgear ReadyNAS 104's, and they all crash under high iscsi load. They are being used to hold backups from a windows server, and the one I've been working on rarely gets through a single overnight backup. I have ssh'd in and it seems that the iscsi backing store is a file sitting on a btrfs mount. The kernel is 3.0.101, which strikes me as a little old for running btrfs although I guess being an appliance they could well have backported everything from a newer more stable release. Or not, going on how much crashing it's doing. I was planning on using netconsole to see if I could capture its dying gasp, but it's not compiled in and not built as a module. A warranty claim is the obvious answer, but that's always a pain so I'm wondering if it's possible to work around the problem by tweaking some things. Netgear are aware of the problem, and have asked things like how full is it getting so I guess they know about the btrfs limitations relating to running out of space. So far the only solution they have offered is to try the latest beta kernel and do yet another factory reset, which we've done. Some info (abridged): # mount /dev/md127 on /data type btrfs (rw,noatime,nodiratime,nodatasum,space_cache) /dev/md127 on /apps type btrfs (rw,noatime,nodiratime,nodatasum,space_cache) /dev/md127 on /home type btrfs (rw,noatime,nodiratime,nodatasum,space_cache) # uname -a Linux RPCV-NAS1 3.0.101.RN_ARM.1 #1 Thu Mar 6 09:31:05 PST 2014 armv7l GNU/Linux Any hints appreciated! Thanks James