> -----Original Message-----
> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Daniel Bakken
> 
> My zfs filesystem hangs when transferring large filesystems (>500GB)
> with a couple dozen snapshots between servers using zfs send/receive
> with netcat. The transfer hangs about halfway through and is
> unkillable, freezing all IO to the filesystem, requiring a hard
> reboot. I have attempted this three times and failed every time.

The behavior you've described is typical for having a device simply
disappear from a zpool.  For example, if you have a zpool on a single
external disk, and you accidentally disconnect the external disk ... *poof*
you need to power cycle.  

If you're using all raidz, or mirrored, or redundant drives ... then it's
typical behavior for a failing or flaky disk controller.

Even if your system is not using external disks, you better consider the
possibility that you've got some flaky or buggy hardware.  I'll suggest
doing a "zfs send" to /dev/null.  And run a scrub.  And see if the system
simply dies because of doing large sustained IO.


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