Dear all

As we wanted to patch one of our iSCSI Solaris servers we had to offline 
the ZFS submirrors on the clients connected to that server. The devices 
connected to the second server stayed online so the pools on the clients 
were still available but in degraded mode. When the server came back 
up we onlined the devices on the clients an the resilver completed pretty 
quickly as the filesystem was read-mostly (ftp, http server)

Nevertheless during the first hour of operation after onlining we 
recognized numerous checksum errors on the formerly offlined device. We 
decided to scrub the pool and after several hours we got about 3500 error 
in 600GB of data.

I always thought that ZFS would sync the mirror immediately after bringing 
the device online not requiring a scrub. Am I wrong?

Both, servers and clients run s10u5 with the latest patches but we 
saw the same behaviour with OpenSolaris clients

Any hints?
Thomas

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