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What is the most likely reason for this situation?

A server providing streaming video to clients is configured with storage from an EMC Symmetrix VMAX array. The data on this server is static and does not change. The file system for the videos is on a 600 GB striped metavolume made up from 8 x 75 GB standard RAID 5 devices.
The storage administrator is baselining the performance of the system using Performance Manager. The administrator notices that the “seq reads per sec” metric is much lower than expected for a heavy sequential read application.
What is the most likely reason for this situation?

Which action should be taken to ensure remote recoverability from disk of Exchange in the case of another fail

Several months ago a company implemented a synchronous R1/R2 architecture with local clone protection enabled by Replication Manager for their Microsoft Exchange 2010 environment.
Recently a failure of the environmental systems led to a site-wide failure, including the Exchange server hardware. Site failover was initiated and the R2 volumes were mounted to a disaster recovery Exchange host.
When the company attempts to mount the databases, they receive a Jet_Page_Not_Found error and the databases will not mount. A tape backup is ordered from the offsite facility and used to restore a backup from several days ago.
Which action should be taken to ensure remote recoverability from disk of Exchange in the case of another failure?

Why are the virtual disks using 100 GB of actual array space once they are created and before any data is put

A storage administrator has presented thin LUNs to a vSphere cluster from an EMC Symmetrix VMAX array. The vSphere administrator then uses those thin LUNs to create VMFS partitions to store virtual disks. When the vSphere administrator creates new virtual machines, a new 100 GB virtual disk was also created.
The virtual disks use 100 GB even though an operating system has not been installed on the guest. Why are the virtual disks using 100 GB of actual array space once they are created and before any data is put on them?

Which option should be used and why?

A company has a Microsoft Exchange Server 2010 database running on Windows Server 2008.
The Windows server contains users with dynamic mailbox growth requirements. In order to efficiently use capacity while still allowing room for extended growth, the company is considering implementing virtual provisioning on their Symmetrix VMAX for this specific mailbox database.
The company is trying to determine which option to use when performing a volume format on the NTFS partition that will contain the mailbox database. Which option should be used and why?