[Bug 20072] tapeinfo reports MaxBlock: 16777215 but writes with blocksize >2M fail

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https://bugzilla.kernel.org/show_bug.cgi?id=20072





--- Comment #2 from lkolbe@xxxxxxxxxxxxxxxxxxxxxxxx  2010-10-11 11:25:15 ---
This is what dmesg has to say about the earlier tries to write to the device
with higher than 2MiB blocksizes:

[92315.076956] st0: Block limits 1 - 16777215 bytes.
[92445.438048] st0: Can't allocate 15728640 byte tape buffer.
[92457.973733] st0: Can't allocate 16777215 byte tape buffer.
[92460.990589] st0: Can't allocate 16777214 byte tape buffer.

--- Comment #3 from lkolbe@xxxxxxxxxxxxxxxxxxxxxxxx  2010-10-13 09:50:22 ---
When instructing bacula to use the advertised tape blocksize of 16M, we get the
following errors everytime it tries to access the tape:

13-Oct 11:48 sd1.techfak JobId 2692: Error: block.c:1002 Read error on fd=5 at
file:blk 0:0 on device "drv2" (/dev/nst0). ERR=Cannot allocate memory.

Is there some limit/sysctl we might have to adapt to the native tape drive
blocksize of 16M?

regards,
Lukas

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