MSA2000 poor write performance

[k_a_tumanov]

  Hello!

  We have MSA2324fc equipped with 16 hard drives (P/N 512547-B21). We have one RAID-6 array configured.

  Controller firmware version: M114P01.

  Recently we have replaced all hard drives in MSA, because most of old drives (old drives have the same P/N) have failed and HP support told us that these drives was counterfeit.

  We did not change anything in MSA or SAN configuration. But with new disks MSA demonstrates poor write performance (for example, about 60 MBytes per second when writing 1 big file), which is 4-5 times lower than it was with old disks.

  What should we do to manage this?

  Thank you!