Symmetrix RAID 1/0 for open systems
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Data Integrity, Availability, and Protection
Symmetrix RAID 1/0 for open systems
RAID 1/0 is a stripe of mirrored pairs that is used in open systems
environments. Drives are first mirrored. In the process, DMSP is
employed to ensure the optimal mirrored performance. Next, the
data is striped across the disks. This combines the advantage of full
redundancy with the additional performance offered by the striping.
For open systems, this involves using metavolumes to stripe data
across mirrored pairs of disks. The stripe size for this is two cylinders.
For some applications, such as Microsoft Exchange, best practices
dictate that RAID 1/0 should be used over basic RAID 1 to enhance
I/O capability. Microsoft Exchange’s workload is random and bursty
with periods of high peaks, making this a difficult storage
environment where I/O capacity per GB becomes important.
Sequential reads or writes for simple concatenated volumes can only
be serviced by a single M1/M2 pair until the end of the hyper is
reached. Sequential read/write operations for a striped meta volume
can be serviced by more spindles. For more details, please see EMC
Symmetrix Storage Solutions Microsoft Exchange 2000 and 2003 Best
Practices, available on the
EMC Powerlink website at:
http://Powerlink.EMC.com
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