Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am planning to install Nexenta (or NexentaStor, I've not decided yet) to build a ZFS NAS out from the following machine:

  • MB: Intel DG45FC
  • Disks: 4x 2TB WD caviar green
  • RAM: 2x 2GB of non-ECC Kingston (I can't afford ECC)
  • System disk: 2x 500GB 2.5'' WD to host a mirrored pool for the system and maybe another mirrored pool for high-priority data

Problem: The MB has only 5 SATA (4 internals + 1 eSATA) ports, whereas I need 4 + 2 SATA ports. I foresee two options:

1) Attach the system disks on the MB controller and buy a 2-port PCI-e x1 SATA card. Issue: Does anyone know the throughput of the ICH10R with Solaris ZFS in RAID5 mode?

2) Buy a 4-ports PCI-e x1 SATA card. Because I am not sure the ICH10R in AHCI mode is very fast, I am also thinking of buying a supported card with decent speed. Issue: I can't find a PCI-e x1 card that is supported and has 4 ports. This comprehensive list http://blog.zorinaq.com/?e=10 doesn't seem to have any that are compatible with my settings.

What do you recommend?

share|improve this question

migrated from stackoverflow.com Jun 16 '11 at 8:04

This question came from our site for professional and enthusiast programmers.

up vote 1 down vote accepted

ICH10R should be fast enough for 4x2 TB WD green and I would recommend to connect the 4x2TB disks to the motherboard and the system disks to an add-on SATA controller.

Another issue to consider is to use data disks optimized for RAID operation instead of WD green (such as WD RAID edition).

share|improve this answer

You don't necessarily need to get an add-in PCIe x1 controller as your ICH10R supports port multipliers and thus isn't limited to just 1 device per sata channel. Buy something like an Addonics AD5SAPM 5x1 Port Multiplier which sits in a empty PCI bay and will let up to five devices share a single SATA channel. Performance of these devices will be capped at single channel SATA2 max speed (300MB/sec) but that's still better than what you'd get in aggregate with any PCIe x1 device (250MB/sec).

Be aware that the Caviar 2TB Caviar Green disks have 4K sectors, but lie and report 512byte sectors to the OS. At pool creation time make sure to specify ashift=12 so that ZFS can align everything to 4K boundaries otherwise your performance will be terrible.

share|improve this answer
    
Thats great !!!!!!!!!!!!!!! +1 For large data storage with out the need for maximum performance like my home NAS server.. MINT! bloody amazing bro! Thanks – ppumkin Sep 4 '12 at 12:14

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .