Not much difference. Leads me to believe (or suspect, anyway) your performance bottleneck is not the speed of the tape, drive, or connection media.
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Thursday, June 13, 2013 2:23 PM
To: midrange-l@xxxxxxxxxxxx
Subject: LTO4 vs LTO3 speed
I read a chart that says basically:
LTO1: Up to 40MB/s
LTO2: Up to 80MB/s
LTO3: Up to 160MB/s
LTO4: Up to 240MB/s
LTO5: Up to 360MB/s
LTO6: Up to 540MB/s
http://www-304.ibm.com/services/weblectures/dlv/partnerworld/online/ltu29864/mod%208%20ibm%20system%20storage%20tape%20part%203.ppt
And another chart that says the drive makes no difference - it's totally dependent on the interface (we use 280D or 5774) (something smells rotten about this claim).
http://www-01.ibm.com/support/docview.wss?uid=nas1b69de8ff8246ff2c8625688700566393
This chart says LTO4 Sustained data transfer rate* Up to 240 Mbps
compressed*; 120 Mbps native
http://www-03.ibm.com/systems/storage/tape/oem/lto4/specifications.html
Another chart says LTO3 Sustained data transfer rate1: Up to 60 Mbps native
We have the LTO4 drives in question mounted in a 3573-L4U (aka TS3200)
http://www-03.ibm.com/systems/storage/tape/ts3200/index.html
Moved from scsi LTO3 to fiber LTO4.
Full system save completed with BRMS:
03/06/13 06/05/13
LTO3 LTO4
SAVSYS 00:07 00:07
*IBM 00:06 00:05
*ALLUSR 06:06 06:18
*LINK 00:20 00:19
Another system:
LTO3 LTO4
SAVSYS 00:18 00:19
*IBM 00:09 00:08
*ALLUSR 02:28 02:34
*LINK 01:30 01:23
Granted, there was a three month time difference in between there.
Utilization may have changed.
System 1:
Information collected . . . . . . . . . : 04/11/13 04:00:02
% of Size in
Description Disk 1,000,000 bytes
User libraries 77.11 3604127.46
User directories 1.50 70014.59
Folders and documents .00 .14
QSYS .10 4481.52
Other IBM libraries .39 18235.97
Licensed Internal Code .11 5182.31
Temporary space .39 18319.04
Unused space 20.41 953978.86
System internal objects .16 7509.85
Objects not in a library .00 .00
TOTAL 100.17 4681849.74
Information collected . . . . . . . . . : 06/13/13 04:00:02
% of Size in
Description Disk 1,000,000 bytes
User libraries 80.05 3741731.66
User directories 1.56 72747.25
Folders and documents .00 .14
QSYS .10 4596.45
Other IBM libraries .38 17809.87
Licensed Internal Code .11 5199.08
Temporary space .31 14563.16
Unused space 17.57 821259.54
System internal objects .20 9196.28
Objects not in a library .00 .00
TOTAL 100.28 4687103.43
System 2:
Information collected . . . . . . . . . : 04/11/13 04:00:04
% of Size in
Description Disk 1,000,000 bytes
User libraries 71.73 650784.59
User directories 7.37 66912.19
Folders and documents .00 16.75
QSYS .53 4825.70
Other IBM libraries 1.67 15128.99
Licensed Internal Code .54 4913.39
Temporary space 2.45 22214.63
Unused space 14.51 131641.09
System internal objects .98 8872.16
Objects not in a library .00 .01
TOTAL 99.78 905309.50
Information collected . . . . . . . . . : 05/30/13 04:00:08
% of Size in
Description Disk 1,000,000 bytes
User libraries 70.35 638249.19
User directories 7.36 66821.73
Folders and documents .00 16.75
QSYS .77 6973.45
Other IBM libraries 1.90 17223.31
Licensed Internal Code .54 4913.39
Temporary space 2.49 22568.05
Unused space 15.78 143215.09
System internal objects 1.02 9224.12
Objects not in a library .00 .00
TOTAL 100.21 909205.08
Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1 Group Dekko Dept 1600 Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com
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