SAN Storage

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A SAN unit stored the data for the Internet Platform andOperations group deployment of Windows SharePoint Services. Theunit comprised switches, two controllers, and three Proliant diskshelves, each of which housed fourteen 36.4-GB hard disk drives.The raw capacity of the SAN was 509.6 GB per shelf, orapproximately 1.5 terabytes (TB) in total.

Figure 4 and Table 3 show how the SAN drives were allocated.Unused drives 105, 302, 402, 500, 504, 600, 601, and 604 are shown as white rectangles.

Figure 4 SAN disk layout

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Table 3 Key to SAN disks

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All drives except those used for backups (database ortransaction logs) used RAID 1+0 (striping with mirroring). Thismaximizes input/output performance while still retainingrecoverability for database files in the event of disk failures.Backup and log disks used RAID 5 for maximum performance andrecoverability, and the quorum uses RAID 1 (mirroring).

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