Spectra T950 - Page 353

Chapter 12 — Library Troubleshooting Troubleshooting MLM Issues
November 2016 User Guide—Spectra T950 Library
353
The media health
reported by MLM
for LTO-4 media
changed after it
was loaded into an
LTO - 5 o r LTO- 6
drive
ThealgorithmusedtodetermineMLM
mediahealthinLTO‐5andlater
generationdrivesdiffersfromthe
algorithmusedforLTO‐4drives.For
BlueScalesoftwareversionsearlierthan
BlueScale12.0.7,whenLTO‐4mediais
usedinbothLTO‐4andLTO‐5orLTO‐6
drives,themediahealth
reportedby
MLMisinconsistentbetweenthe
differentdrivegenerations.
BeginningwithBlueScale12.0.7,afteran
LTO‐4cartridgeisloadedintoanLTO‐5
orlatergenerationdrive,thelibrary
adjuststhealgorithmusedtocalculatethe
mediahealthscorewheneverthe
cartridgeissubsequentlyloadedintoan
LTO‐4
drive.Thisadjustmentensuresthat
thereportedmediahealthisconsistent,
regardlessofwhethertheLTO‐4cartridge
isusedinanLTO‐4oranLTO‐5orlater
generationdrive.
AsabestpracticeforyourLTO‐4
media,SpectraLogicrecommends
thatyouconfigureLTO‐4and
LTO‐
5orlatergenerationdrivesin
separatepartitionsandthatyou
donotroutinelyshareLTO‐4
mediabetweenLTO‐4andLTO‐5
orlatergenerationdrives.
LT F S - f o r m a t t e d
LTO - 5 d at a
cartridges are
treated as non-
MLM cartridges
LTO‐5drivesusingfirmwareversion
B6W0orlaterautomaticallymovethe
MLMdataonthecartridgeMAMthefirst
timeacartridgeisloadedandthen
unloadedfromthedrive.Fromthatpoint
forward,theMLMdataismaintainedin
thenewlocation.
 IfthecartridgeisformattedtouseLTFS
beforetheMLMdataismoved,the
MLMdataislost.
 IfaproperlypreparedandLTFS‐
formattedcartridgeisloadedintoan
LTO‐5drivethatisnotusingfirmware
versionB6W0orlater,thedrivecannot
locateorupdatetheMLMdataonthe
cartridge.
 Ifyouplantoreformatyour
LTO‐5datacartridgestouse
LTFS,loadandthenunload
eachcartridgeintoanLTO‐5
drivethatisusingfirmware
versionB6W0orlaterbefore
youreformatthecartridges.
 ToensurefullMLMtrackingof
yourLTFS‐formattedLTO‐5
datacartridges,makesureall
LTO‐5drivesinthelibraryare
updatedtofirmwareversion
B6W0orlater.
Issue Cause Resolution