0

I want to build a hardware RAID1 setup with two HDDs (SATA3, 7200, 64MB cache) and I'm looking at two, almost the same, Adaptec cards (6405E vs 6805E)

The 6405E is PCI-E 2.0 x1 while the 6805E is PCI-E 2.0 x4. Both are 128MB cache.

If I take the 6405E, will the PCI x1 bandwidth bottleneck be really visible? This won't be a system drive, just data.

NB: Other Adaptec models might better suit my needs/budget (eg: 6405), but I can't find them online.

PS: Yes I know, the battery module is not included (6405E) / not possible (6805E)

1

If either will work, and you're only connecting 7200RPM SATA drives to it, I doubt you'll saturate a PCIe 2.0 1x lane.

http://en.wikipedia.org/wiki/PCI_Express

States that it should be able to perform at about 500mb/s, per lane (the 4x connector would offer about 2gb/s). PCI Express 2.0 has about a 20% overhead, so your actual maximum throuput is about 400 mb/s, but throughput of 7200 RPM drives is generally under the 100 mb/s range. Unless you need more than 4 disks, I think the 6405E will fit nicely.

2
  • 1
    As far as the battery module goes, My opinion is that you shouldn't need it unless you have mission critical production data that has a lot of random IOPS. Considering you're using SATA 3 7200 RPM drives instead of 10k ones, I think you can get away with putting the computer on a decent UPS. – IceMage May 20 '15 at 14:52
  • For some dumb reason, I forgot to take in account the throughput of a HDD drive... well below 600MB/s. – BlakBat May 20 '15 at 15:16

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.