Sun Microsystems Virtual Tape Library Manuale Utente Pagina 54

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Managing virtual libraries
40 VTL User Guide May 2008 G • 96267
boththeneededlongtermstoragecapacityandthefaste stpossibletransfertotape
media.Compressionhardwarecannotfurthercompressdatathat has been
compressedbysoftware,sotheendtoendbackupprocessissignificantlyslower.
Ontheotherhand,theVTL softwarecompressionfeatureis valuablewhenitis
truly
needed:
whendataisstoredontheappliancelongterm,ratherthancac he d pending
migrationtolongtermstorageon physicaltape
whendatahastobereplicatedacrossaslowWANlink.
3. Ifyouplantousetapecaching,usethespinnercontroltoadjusttheTape
Caching Policy Disk Capacity Thresholdto85%(
D above).
Whenusing automatictapecaching,youhavetomakesurethatthediskneverfills
up,preventingyoufromcreatingnewvirtualvolumes.The75%thresholdhasbeen
foundtoofferagoodmargin ofsafety.
4. PressOK(
E above) .
Stophere.
D
C
E
85
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