...and if this post is still valid, this may be the maximum speed
(55M/s) given that the LTO-3 and disk are on the same SD (even though
tape compression is on.)
http://www.mail-archive.com/bacula-devel AT lists.sourceforge DOT
net/msg01246.html
[Kern]"...so I forget the formulas for calculating this, but basically, you must
wait to get data from the disk, then wait to write it to the tape, and that
slows down both. To run at full speed, you need two threads, one that reads
from disk and buffers in memory, then a second thread that writes to tape..."
On 1/5/2010 2:21 PM, Alex Chekholko wrote:
> On Mon, 04 Jan 2010 13:38:47 -0500
> Brian Debelius<bdebelius AT intelesyscorp DOT com> wrote:
>
>> I am using batch inserts into MySQL. The database is on a different
>> RAID1 volume.
>>
>> On 1/4/2010 1:21 PM, Richard Scobie wrote:
>>> Brian Debelius wrote:
>>>> Shamless bump. Does anyone have any insight into this?
>>>>
>>>> Thanks
>>>> brian-
>>>
>>> The difference between the dd tests and bacula backups is that catalog
>>> writes are occuring in the latter.
>>>
>>> Perhaps you have a database bottleneck? Is the database stored on the
>>> RAID also?
>>>
>
> The next thing to check is the block size that Bacula is using.
>
> Try increasing your Bacula block size and Bacula network block size.
>
> Search for Ralf Gross's notes on LTO-4 performance in the archives.
> http://www.google.com/search?q=ralf+gross+lto-4
>
> Mainly something like this:
> Maximum Block Size = 262144
> Maximum Network Buffer Size = 262144
> Maximum File Size = 5G
>
> Keep in mind that tapes written with different block sizes will be
> incompatible, I think. So you won't be able to read your old backups
> unless you remove that new block size from the sd config, I think.
>
> Regards,
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