unità a nastro hp StorageWorks Ultrium
guida introduttiva
modello esterno
Ultrium 215e
Come ottenere prestazioni ottimali
•Installare su bus SCSI LVDS Ultra 3 (160) o superiore o su bridge FC/SCSI di pari livello.
•Se ci si collega ad un server, utilizzare un bus SCSI dedicato.
•Utilizzare le cartucce per dati HP Ultrium 2 da 400 GB.
•Verificare che l'unità sia dotata dell'ultima versione di firmware.
•Verificare che siano disponibili gli ultimi aggiornamenti ed i patch per l'applicazione di backup.
•Assicurarsi che l'applicazione di backup sia la più adatta alla configurazione.
•Accertarsi di utilizzare i driver più recenti.
Ottimizzazione del sistema per il backup
•Consultare la documentazione relativa all'applicazione di backup. Potrebbe essere necessario regolare le impostazioni di trasferimento, blocco e dimensioni del buffer per ottimizzare la velocità alla quale l'applicazione scrive i dati nell'unità a nastro.
•Verificare la documentazione del sistema operativo. Potrebbe essere necessario regolare il limite dimensionale del pacchetto di trasferimento dati.
•Consultare la documentazione relativa all'applicazione. È necessario assicurarsi che le applicazioni per l'utente come Exchange o i server di database vengano ottimizzate per il backup.
Per ulteriori informazioni consultare la sezione ‘Ottimizzazione delle prestazioni’.
Altri fattori in grado di limitare le prestazioni
•Il sottosistema del disco. Un sistema con un solo disco rigido non sarà in grado trasferire i dati alla velocità ottimale. È quindi preferibile adottare soluzioni con RAID.
•Il file system. Le dimensioni dei file possono influire sulle prestazioni – un numero elevato di file piccoli richiede, per essere copiato, un tempo superiore rispetto ad un numero più limitato di file di grandi dimensioni.
•I dati – tipi di file diversi possono essere compressi in percentuali diverse.
•L'infrastruttura – interferenze o problemi dell'infrastruttura SCSI o fibre possono limitare le prestazioni.
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