Tape writing problem

[kafar]

Since update from 9.3 to 9.10 I have problems to write or read on tape device. I have lot of backup tapes (LTO-4) and thay are worthless at the moment.
I have used to backup with dd (for example dd if=/mnt/Storage/123.tar of=/dev/nsa0 bs=2048k). It has worked fine in FreeNAS v. 8 to 9.3. I had transfer rate about 100 mb/s.
Now I get error:

Code:

nsa0: request size=2097152 > si_iosize_max=131072; cannot split request
nsa0: request size=2097152 > MAXPHYS=131072; cannot split request
dd: /dev/nsa0: File too large
1+0 records in
0+0 records out
0 bytes transferred in 0.062369 secs (0 bytes/sec)

To avoid this I have changed bs rate max to 128k and write process has started with about 14 mb/s what is unacceptable.
I am looking for possibility to increase MAXPHYS/si_iosize_max.
Till now I have added Tunable (System=>Tunables loader or rc.conf) without success.

Maybe has anybody a hint for me.

Mark

 

[wblock]

I have not used tape drives with FreeNAS, but the MAXPHYS assessment sounds like a good place to start. One of the FreeBSD mailing lists, like freebsd-questions, might be a better place to ask.