CLI Guide

• Clean Requested (also know as Clean Periodic TapeAlert 15
Clean Requested is based on usage, but not media motion hours. Two criteria are used, Data sets
processed or Meters of tape pulled across the head. If another cartridge is inserted after Clean
Requested is asserted, the drive continues to operate. However, the ‘C’ on the Single Character
Display (SCD) of the drive persists until the drive is cleaned or power cycled. If the drive is power
cycled, the ‘C’ will reappear on the SCD until the drive is cleaned. Periodic clean events continue
to be posted to the engineering log (see 6.7.1.1) after every cartridge.
Table 12 Drive Cleaning Criteria to assert Clean Requested
Generation
Data Sets
Processed
Head Tape Meters
Pulled
Equivalent Full Passes:
Based On:
Data Sets
Meters of Tape
LTO5 HH 5_000_000 2_500_000 8 39
LTO 5 FH
7_500_000
3_750_000
12
58
LTO 6 FH and HH
15_000_000
3_750_000
15
34s
LTO 7 FH and HH
18_000_000
3_750_000
15
36
Key:
HH-Half Height
FH-Full Height
Equivalent Full File Passes is an estimate and are not used as criteria. The information provides a feel
for the criteria used. Note that this criteria does not consider whether or not the tape is actually used in
a full-file manner or whether the tape is only used repeatedly around a short area of tape.
Note : If you perform a backup with verification, you see a cleaning request twice as frequently as you do
when you perform a backup without verification. Verification doubles the number of passes the tape
makes over the head.
Note : Most backup applications support Tape Alerts. If the tape drive requests cleaning, the backup
software notifies you of the need to clean.
8.3 Characteristics of Expired LTO Cleaning Tape
Table 13 Characteristics of Expired LTO Cleaning Tape in Various Drives
Drive Type
Cleaning with a Good Tape
Cleaning with an Expired Tape
Dell PowerVault
110T LTO
•
Ready light blinks
green.
• Use cleaning
cartridge light turns
on.
• Ejects tape when
done.
•
Ready light blinks green.
• Ejects tape out shortly after
inserting
Dell PowerVault
110T LTO-1
•
Power light on solid
green.
• Activity light on solid
green.
•
Power light on solid green.
• Activity light on solid green.
• Status light blinks amber.
• Ejects tape shortly after inserting.
18 Dell PowerVault Tape Systems | A05