Disk benchmarks

Individual disks

• WDC WD40EZRX-00SPEB0 - write rate: 150->70 Mbytes/sec

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
• per-port 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

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.