Thanks much, I'll try today the block size change first. Then try the
spooling. Dont have any unused disk, but may have to try on a shared
drive.
The "maximum file size" should be okay? g.
On Wed, Nov 30, 2011 at 8:45 AM, Alan Brown <ajb2 AT mssl.ucl.ac DOT uk> wrote:
> gary artim wrote:
>>
>> Hi --
>>
>> Getting about 41.6/MBs and hoping for closer to the max (120MB). I
>> tried maximum file sizes of 5, 8, 12GB -- 12GB the best the others
>> where about 35/MBs. Any advise welcomed...should I look at max/min
>> block sizes?
>
>
> Don't adjust min size.
>
> Bacula's max block size is ~2Mb (default 65535 bytes) and setting this
> should give a substantial speed boost (it did for me). Going higher than
> bacula's maximum will result in it failing throught to default, so double
> check the block size on a newly labelled tape before committing to any
> value.
>
> WARNING: If you adjust this value, mark all current tapes as USED before
> restarting bacula-sd. Changing block size on an open tape is likely to lead
> to problems getting data off it.
>
> LTO drives tend to have 16Mb maximum buffers. Perhaps Bacula's max block
> size needs increasing? (Kern?)
>
> You should also enable spooling to _very_ fast disk before hitting the tape.
> LTO3 upwards will easily run faster than any spinning media and trivially
> outrun even a raid array if that has to do any seeking.
>
> I use a raid0 set of 5 of Intel E25 60Gb drives and have seen throughputs
> approaching 700Mb/s out to 3 tape drives whilst other jobs are spooling
> (I've got 7 LTO5 drives carrying 6 pools but have never seen more than 3
> writing simultaneously). These days I'd be more inclined to use one of the
> PCIe SSD cards as they're even faster, with less overhead.
>
>
>> Device {
>> Name = LTO-4
>> Media Type = LTO-4
>> Archive Device = /dev/nst0
>> AutomaticMount = yes; # when device opened, read it
>> AlwaysOpen = yes;
>> RemovableMedia = yes;
>> RandomAccess = no;
>> Maximum File Size = 12GB
>
>
> Maximum Network Buffer Size = 65536
> Maximum block size = 2M
>
> Spool Directory = /var/bacula/spool/LTO4
> Maximum Spool Size = 280G
> Maximum Job Spool Size = 150G
>
>
>> Autochanger = yes
>> Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
>> Alert Command = "sh -c 'smartctl -H -l error %c'"
>> }
>
>
> Enlarging network buffers is possible but it must be be the same everywhere
> and should be thoroughly tested first as it can as easily cause complete
> breakage as speedups - especially if backups are taking place across a
> routed network instead of just on your LAN.
>
>
> AB
>
>
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