Beta Labs: TEST – SCST Slow Bulk SATA2 Soft-RAID6

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Beta Labs: TEST – SCST Slow Bulk SATA2 Soft-RAID6

Test Setup
Target

  • ASUS KFN32-D/SAS with single Opteron 8354 and 16 GB RAM.
  • 2 Gb Fibre Channel to PCI-X HBA.
  • SCST: NV_CACHE and 512 block size.

VG:

  • VG Size 10.92 TiB
  • PE Size 4.00 MiB

Soft-RAID6:

[root@tc0s2 ~]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md127 : active raid6 sde1[1] sdj1[6] sdh1[4] sdi1[5] sdk1[7] sdf1[2] sdg1[3] sdd1[0]
11721073152 blocks super 1.2 level 6, 256k chunk, algorithm 2 [8/8] [UUUUUUUU]
  • SCSI storage controller: LSI Logic / Symbios Logic SAS1068 PCI-X Fusion-MPT SAS
  • 8 * WDC WD20EARS SATA disks.

Initiator

  • HP DL360 G5 with single Xeon 5140 processor and 8 GB RAM.
  • 2 Gb Fibre Channel to PCI-e HBA.

Results
Sequential Read and Write

dd block size 1024k

Initiator to taget:

    209715200000 bytes (210 GB) copied, 1610.66 s, 130 MB/s

Target to initiator:

    209715200000 bytes (210 GB) copied, 1458.25 s, 144 MB/s

Target to initiator to target:

    104857600000 bytes (105 GB) copied, 2082.58 s, 50.3 MB/s

References