Hi Udo,
Thanks for your input, with the itdt command I got the following;
Compres- Transfer Data Size Elapsed Data Rate
able Size (KB) (MB) Time (s) (MB/s)
+------+---------+---------+--------+----------+
| No | 512 | 29999 | 104.766| 286.342 |
| No | 256 | 29999 | 104.386| 287.385 |
| No | 128 | 29999 | 114.132| 262.844 |
| No | 64 | 29999 | 155.715| 192.654 |
| Yes | 512 | 29999 | 76.9336| 389.934 |
| Yes | 256 | 29999 | 85.9795| 348.909 |
| Yes | 128 | 29999 | 108.639| 276.135 |
| Yes | 64 | 29999 | 152.646| 196.526 |
In the Device resource for my LTO drive I've added;
Minimum block size = 256K # Seemed to be optimal
Maximum blocksize = 512K # Seemed to be optimal
Maximum File Size = 29G # Less start-stops for EOF marks
The Bacula docs defines a default of 64K which seemed to perform
'poorly' for my drive.
Now I'm running a test copy job of 600GB, averaging 210MB/sec and
peaking 240MB/sec at time, huge improvement, never heard the drive zoom
so hard during writes.
Thank you once again!
- Gilles
On 4/8/25 18:13, Udo Kaune wrote:
Am 08.04.25 um 16:17 schrieb Gilles Van Vlasselaer:
Hi Udo,
Your Maximum File Size ist too small. If you assume 300MB/sec the
tape would stop every 5000/300 seconds to write an EOF mark. That
cannot be fast. Please try at least the amount of data for writing 3
minutes sustained (Maximum File Size = 54GB).
I'll try this once the current copy job is complete, benchmarking the
btape speed command using file_size=5 wrote 5GB chunks, which reached
the 200MB~/sec mark.
What size are your file volumes?
Pool Daily -> Incrementals + daily bacula DB dump
+------------+-----------+---------+-----------------+----------+
| volumename | volstatus | enabled | volbytes | volfiles |
+------------+-----------+---------+-----------------+----------+
| Catalogs | Used | 1 | 407,715,205,671 | 94 |
| Daily-13 | Used | 1 | 953,720,636,816 | 222 |
| Daily-10 | Append | 1 | 79,824,581,674 | 18 |
| Daily-11 | Used | 1 | 778,609,282,174 | 181 |
| Daily-12 | Used | 1 | 573,366,535,214 | 133 |
| Daily-0085 | Used | 1 | 408,215,876,761 | 95 |
| Daily-0260 | Used | 1 | 460,077,395,998 | 107 |
+------------+-----------+---------+-----------------+----------+
Pool Weekly -> Full backups
+-------------+-----------+---------+-------------------+----------+
| volumename | volstatus | enabled | volbytes | volfiles |
+-------------+-----------+---------+-------------------+----------+
| Weekly-0035 | Used | 1 | 3,224,557,692,497 | 750 |
| Weekly-0036 | Used | 1 | 2,323,662,023,874 | 541 |
| Weekly-0037 | Append | 1 | 5,563,811,862,205 | 1,295 |
| Weekly-0043 | Full | 1 | 202 | 0 |
+-------------+-----------+---------+-------------------+----------+
Am I'm missing some important properties in the resources? Any help
is appreciated.
- Gilles
Hi Gilles,
Your Maximum File Size ist too small. If you assume 300MB/sec the
tape would stop every 5000/300 seconds to write an EOF mark. That
cannot be fast. Please try at least the amount of data for writing 3
minutes sustained (Maximum File Size = 54GB).
Be aware that you have to wait at least for one complete block to be
read if you are doing a restore. (3 minutes again in our example).
What size are your file volumes?
Please also try to analyse your drive using the latest IBM Tape
Diagnostics Tool. Sample output below. Transfer Size (KB) will
translate to "Maximum Block Size" in Bacula Device config. Changing
this parameter will possibly inhibit restore from your already written
tapes. Remember to change it back if you need access to existing backups.
https://www.ibm.com/support/fixcentral/swg/selectFixes?parent=Tape%20drivers%20and%20software&product=ibm/Storage_Tape/IBM+Tape+Diagnostic+Tool+ITDT&release=1.0&platform=Linux&function=all
IBM Tape Diagnostic Tool Standard Edition - System Test
Model Serial Fware Result:
+--------------+------------+------+ +----------------------+
| ULTRIUM-HH6 | 10WT160994 | K4M1 | |
PASSED |
+--------------+------------+------+ +----------------------+
Code:
Compres- Transfer Data Size Elapsed Data Rate
+----------------------+
sible Size (KB) (MB) Time (s) (MB/s) |
OK |
+------+---------+---------+--------+----------+
+----------------------+
| No | 1024 | 6250 | 86.106 | 131.983 |
| No | 512 | 6250 | 79.495 | 92.647 |
| No | 256 | 6250 | 80.386 | 92.6353 | Text Log:
| No | 128 | 6250 | 79.539 | 92.5118 |
+----------------------+
| No | 64 | 6250 | 79.595 | 92.3869 | |
10WT160994.001.txt |
| Yes | 1024 | 6250 | 21.931 | 392.07 |
+----------------------+
| Yes | 512 | 6250 | 21.428 | 376.521 |
| Yes | 256 | 6250 | 20.752 | 392.87 | Bin Log:
| Yes | 128 | 6250 | 23.14 | 347.029 |
+----------------------+
| Yes | 64 | 6250 | 36.571 | 281.224 | |
10WT160994.001.blz |
+------+---------+---------+--------+----------+
+----------------------+
<[Q] Quit | + | - | [R] Return> q
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