Hello,

We have MD3220 SAS connected to two HPE host with ESXi 6.7U3

(SAS port have maximum goodput 0.8*4*6Gbps=19.2Gbps=2.4 GB/s)

RAID6 (16*HDD 10k), 128K stripe, 32K cache block, enabled dynamic cache read prefetch.

(each HDD can sequential read 200MB/s, thus RAID6 can maximum 200*(16-2)=2800 MB/s)

VM disk: SCSI controller VMware Paravirtual, Thick Provision Eager Zeroed, NTFS 64KB cluster.

we need to get the maximum performance for sequential reading with 1MB block size and QueueDepth=1.

but disk benchmark show only 733MB/s for sequential read speed:

 

Why MD3220 so slow?