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Re: [Bacula-users] LTO-4 Drive issues
2010-05-23 08:58:32
What is your blocking factor on the drive? Assuming hardware is OK it
sounds like you do not have your drive configured properly for variable
block sizes.
issue:
mt-st -f /dev/st0 setblk 0
mt-st -f /dev/st0 defblksize 0
mt-st -f /dev/st0 defcompression 0
mt-st -f /dev/st0 compression 0
(or mt depending on what tape package you have on fedora). The first
two set your drive to variable block, the next two turn off compression
(to get raw performance for a test). run btape against your drive.
Alternatives would be to use tar with something like:
tar -cv -b1024 -f /dev/st0 <largefile>
where <largefile> is a multigb file preferably non fragmented.
Another thing to take a look at is your st driver settings, under some
versions of linux this is in /etc/modprobe.d/mt-st On my ubuntu box
here I use:
options st buffer_kbs=2048 max_sg_segs=128
For bacula you want to modify your bacula-sd.conf for your tape
device. Main items would be:
Maximum Block Size = 262144
Maximum File Size = 5GB
Maximum Network Buffer Size = 262144
And set your spool size as large as you can.
On 05/23/2010 00:06, skipunk wrote:
I found another site showing the use of byte size and dd and after playing with it a bit i can hold 115 MB/s easy and backup my 3.5 GB file like nothing. I'm looking through Bacula documents, I don't recall if this can be set or not in the config files.
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