For most modern Storage Systems, this is no longer practical. Most Storage Arrays are now shipped as “striped everything” systems. Logical units (LUNs) are now striped across most, or all of the disks in a storage subsystem, yielding many spindles underneath the logical stripe. In theory this allows for significant spindle aggregation of IOPs and throughput. However, now the LUNs are all sharing the same underlying spindles (each with its own
stripe set). The system administrator or installer should be clearly aware of the IO workload and characteristics of the SAS application set they are provisioning. Knowing the shared physical environment they are placed over, care must be used to ensure proper underlying performance, given sharing with other applications. Ongoing monitoring vigilance must be maintained to ensure the file systems performance for SAS Applications is not compromised by other applications (especially random-oriented activity) sharing the same underlying physical storage.