Disk benchmarks

Individual disks

• WDC WD30EZRX-00MMMB0 - read rate: 130->??? M/s, ave ??? M/s, write rate: 130->50 M/s, ave 100 M/s
• WDC WD40EZRX-00SPEB0 - read rate: 150->70 M/s, ave 120 M/s, write rate: 150->70 Mbytes/sec
• WDC WD4001FAEX-00MJRA0 - read rate: 150->80 M/s, ave 130 M/s
• WDC WD4003FZEX-00Z4SA0 - read rate: 180->100 M/s, ave 150 M/s

Raid interfaces

Marvell 88SE9485 (PCIe x8 to 8 SAS/SATA 6Gb/s Ports I/O Controller)

lspci: LnkSta: Speed 5GT/s, Width x8

• per-port speed: full disk speed on each port
• total read speed vs number of active disks, using 4TB disks:
  • 1 - 150 M/s - 1x
  • 2 - 273 M/s - 1.8x
  • 3 - 430 M/s - 2.8x
  • 4 - 544 M/s - 3.62x
  • 5 - 573 M/s - 3.82x
  • 6 - 593 M/s - 3.95x
  • 7 - 623 M/s - 4.15x
  • 8 - 640 M/s - 4.2x
• conclusion: 88SE9485 saturates at 4 disks (correct PCI config confirmed - x8 at 5GT/s). Adding 4 more disks do not increase data rate.

Marvell 88SE9230 (4 SATA)

lspci:

• LnkSta: Speed 5GT/s, Width x2 (on Z87 mobo)
• LnkSta: Speed 5GT/s, Width x2 (plugin board)

• per-port speed: full disk speed on each port
• total read speed vs number of active disks, using 4TB disks:
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
• conclusion:

Raid arrays

• 4xWD40EZRX RAID5 Z87 88SE9230, 88SE9485: raw: read: 420 M/sec, write: ~400 M/s. xfs: read/write: 400->300 M/s (10min avg)
• 6xWD40EZRX RAID6 Z87 1x88SE9485: raw: .... xfs: write /dev/null 600->300 M/s, 443 M/s ave across 17TB, xfs read: 550->300 M/s, 440 M/s ave across 17TB, strip_cache_size 32k.
• 8 (6xWD40EZRX+WD4001FAEX+WDC WD4003FZEX) RAID6 Z87 1x88SE9485: raw: read: 673 M/s ave first 30 sec, write: ???, xfs: write /dev/null 800->??? M/s, ??? M/s ave across ??? TB, xfs read: 530-620->??? M/s, ??? M/s ave across ??? TB, strip_cache_size 32k.