In continuing testing here I am still unable to get full speed even when using 
the 96-drive array (16x 6-drive raidz2 vdevs).   Which is just insane.   Also 
tried a raid-0 of 16 drives as a spool array.

Now the last volume I just tried ended with this:

2012-04-12 19SD-loki JobId 2: End of Volume "FA0064" at 66:91229 on device 
"LTO4" (/dev/nst0). Write of 64512 bytes got -1.

Which I find interesting as the 64512 there would (in my mind) assume that 
bacula is trying to write 65K blocks?   This is the exact same number of the 
last block written on each volume.     If bacula WAS writing this small of a 
block size I could see where the problem is.

My bacula-sd.conf is:

---
Device {
  Name = LTO4
  Changer Device = /dev/sg87
  Alert Command = "sh -c 'smartctl -H -l error %c'"
  AlwaysOpen = yes;
  Archive Device = /dev/nst0
  AutomaticMount = yes;
  Maximum Block Size = 4194304
  Maximum File Size = 10G
  Maximum Job Spool Size = 800G
  Maximum Network Buffer Size = 262144
  Maximum Spool Size = 12800G
  LabelMedia = No
  Media Type = LTO4
  RandomAccess = no;
  RemovableMedia = yes;
  Spool Directory = /scratchdir/spool0
}
-------

So I'm trying to set it to 4MiB here.   (Again  running 5.2.6 and seeing in teh 
release notes that this was uppped to 20MB max).   I also tried 2097152.

Drive itself is set to variable block sizes and when loading the module it  
shows it can handle up to 16MiB-1:

Apr  4 13:08:52 loki kernel: [   72.194766] st 8:0:17:0: Attached scsi tape st0
Apr  4 13:08:52 loki kernel: [   72.194767] st 8:0:17:0: st0: try direct i/o: 
yes (alignment 4 B)
Apr  4 13:08:52 loki kernel: [   72.350579] st0: Block limits 1 - 16777215 
bytes.


So question, in the End of Volume message, is that a correct assessment that 
the SD is trying to write in blocks of 64512bytes?    

If so, why is it not taking the larger block size as specified in the 
bacula-sd.conf file?





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