E24254-01 •
Appendix A Content Management 139
Content Management
■
Minimizing Elevator and PTP Activity
•
Take advantage of the
float
option to limit pass-thru activity.
•
Make sure volumes can
float
to locations in other LSMs—after a
pass-thru—by maintaining some free cells within each LSM.
•
When dismounting cartridges, and
float
is on, ACSLS and HSC try
to avoid an elevator pass-thru among LSMs by assigning a new
home cell—if that cartridge’s old home slot is in a different LSM.
•
When float is on ACSLS and HSC attempts to put the cartridge:
-
In the same LSM as the tape drive
-
To the closest LSM to the drive with free storage slots
•
Elevators have the capability of passing up to
four
tapes.
•
Currently, elevator pass-thru times are faster than the pass-
thru ports.
•
PTPs have the capability of passing up to
two
tapes.
As pass-thru activity (elevator and pass-thru ports) increases, performance (exchanges per hour)
decreases. Here are several things you can do to minimize or improve pass-thru activity.
❏
Mounting cartridges
Mount cartridges in tape drives that are on the same rail (LSM).
❏
Use the float option
❏
Entering cartridges
Enter cartridges into an LSM that has compatible tape drives for that
media-type.
Note:
When entering tape cartridges, place them in the CAP
magazine adjacent to the LSM where they will reside.
For example
: you only have T9840 drives on LSMs 2 and 3. You should
enter 9840 cartridges in to the CAP slots adjacent to these LSMs.
❏
Maintain scratch
cartridge levels
Make sure that scratch cartridges are available in sufficient quantity for
each tape workload.
For an SL8500, this means having scratch cartridges available on each
rail (LSM) of the library.
❏
Keep free cells
Make sure there are adequate free cells in each LSM.
❏
Plan pass-thru activity
When planning workloads for a
library complex
where the workload
requires more than one LSM, consider the following:
Elevators:
Use
adjacent
LSMs in the same library to limit the distance
the cartridges must travel. Remember, there is a 50%
chance with drive preferencing that the cartridge and drive
are on the same rail between two LSMs.
PTPs:
If the library has high pass-thru activity using the elevator,
consider using
adjoining
LSMs and the pass-thru ports.
❏
Use ExLM
Use ExLM for mainframe operating systems to manage cartridges.
Summary of Contents for StorageTek StreamLine SL8500
Page 4: ...Summary of Changes iv SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 12: ...Contents xii SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 18: ...Tables xviii SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 76: ...Introduction 56 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 97: ...E24254 01 Chapter 3 Site Survey Forms 77 Site Survey Forms Figure 21 Content Management Plan ...
Page 137: ...E24254 01 Chapter 4 Site Preparation 117 Site Preparation ...
Page 138: ...Site Preparation 118 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 198: ...Electrical Conversions 176 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 206: ...Comparisons 184 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 233: ...E24254 01 Appendix H Partitioning 211 Partitioning Make copies as necessary ...
Page 240: ...Partitioning 218 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 251: ...E24254 01 Appendix J Work Sheets 229 Work Sheets Figure 73 Content Management Work Sheet ...
Page 276: ...Index 254 SL8500 Systems Assurance Guide June 2011 E24254 01 ...
Page 277: ......
Page 278: ...Oracle Corporation Worldwide Headquarters 500 Oracle Parkway Redwood Shores CA 94065 U S A ...