Looking for some guidance regarding sizing a DS3500 with the dynamic disk pooling and what affect this has on IOPS. The documentation seems to suggest its using a RAID 6 'under the hood' so does this mean it would still suffer the RAID 6 IOPS write penalty (i.e. number of write IOPS x 6) or do the same rules not apply to disk pools?
Re: Disk Pool IOPS2013-01-31T11:33:14ZThis is the accepted answer. This is the accepted answer.DDP is a king of RAID6 and should suffer of all it "diseases". The thing which helps, RAID6 is implemented in ASIC hardware, so it's performance is near RAID5. When RAID6 was just implemented in DS series storages, there was a document which compared RAID5 and RAID6 performance. As far i remember, RAID6 performance was near to RAID5.
Related to DDP performance compared to RAID6:
DELL document related PowerVault MD3 (the same as DS3500)
I don't remember where i find this document, which compare DDP and RAID6 on DS3500 and DCS3700
and, if you are interested in general performance questions, i recommend "A practical Introduction to
Disk Storage System Performance" by Gero Schmidt
and "Getting The Hang Of IOPS, An Introduction to Disk Performance"