How am i going to justify moving from a dmx4 with r5 to a vmax with r1 ..with active data that will not sync down to r6?
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RAID1 is the most cost effective protection for IOPs. If you want to go with a 100% FC option, then RAID5 would be fine.
raid 1 is the most expensive protection option, everything you guys presented at EMC world was about how only very little % of the whole box is heavy IO and you can offload that to EFDs but now you are recommending to go with the most expensive (other than EFD) protection ? If my workload is very heavy on the read side why would i go with raid 1 ?
If there is little writes in the workload, raid5 should be OK, but be aware of the increased chance of a dual drive failure.
For most workloads, RAID1 will provide about 2x the IOPs for the same number of disks than RAID5, hence the recommendation for RAID1 for the IOP tier.