You have an Exchange Server 2010 organization. You plan to deploy a database availability group (DAG). You need to recommend disk configuration for the servers in the organization. The solution must…

Question

Exhibit

Options

• A7200 RPM SATA hard disks in a Direct Attach Storage (DAS)
• B7200 RPM SATA hard disks in a Network Attached Storage (NAS)
• C15000 RPM SAS hard disks in a Network Attached Storage (NAS)
• D15000 RPM SAS hard disks in a Fiber Channel (FC) Storage Area Network (SAN)

• A
  77% (30)
• B
  13% (5)
• C
  8% (3)
• D
  3% (1)

Explanation

Microsoft recommends DAS [for example JBOD on SATA] when Mailbox server is not virtualized. But there are scalability problems. You would need to have at least capacity for 2 years period. Another alternative is iSCSI SAN. And finaly Fibre channel SAN. D is expensive. Exchange 2010 doesn't support network-attached storage (NAS). For Exchange Server 2010, the IOPS per user is now 0.1 (it was 0.3 IOPS per user in 2007) [in Exchange 2010 ESE combines multiple I/O operation into a single request]. therefore in theory you could have: It is better to have large disk but slower disk: a 1TB disk that can perform only 50 IO operations per second (IOPS) can provide substantially more capacity than the 146GB disk at only 25 percent of the cost. The combination of JBOD and less expensive disks can result in dramatic cost savings for your

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