Talk:Vblade - ATA over Ethernet

From NAS-Central Buffalo - The Linkstation Wiki
Jump to: navigation, search


This isn't really a fair comparision for cost at all, after all Coraid's devices are SATA and Gigabit Ethernet optimized. But still it's a fun comparision to see what opensource hardware and software can get you.

15 blades no included hard drives

15 blades x 750GB = max 11.25TB


Kurobox + Netgear Switch


Open Source Saves you $1594


As I said certainly not a fair comparison, the Coraid hardware is different (SATA vs PATA) and optimized from a ethernet switching standpoint vs the Kurobox/Linkstation.

But still a savings of $1600 is nothing to sneeze at!

- Ramuk 23:57, 27 August 2006 (EDT)

At 1000Mb/s / 8bits/Byte / 15 kuroboxes = 8.33 MB/Sec needed in transfer rate per kurobox RAIDed together to completely soak a 1Gb/s ethernet connection. Seems like it could be doable expecially with XFS....hmmmmmmmm

- Ramuk 02:17, 28 August 2006 (EDT)

My Setup

  1. USB Drive
    1. I bricked my LS when trying to mount an internal partition the first time I tried this, so I used a usb drive this time around. Which on my LinkStation was /dev/sda1 - Ramuk
  2. My Client
    1. In this case I have a PIII/600 Compaq Armada laptop running Ubuntu Dapper Drake. - Ramuk

Transfer speeds

  • Very interesting indeed. Mounting a 20 GB USB 2.0 External Drive over a 100baseT switch using the StarPort software from Rocket Division Software on a Windows XP computer I was able to get a sustained 4 Megabyte/sec or 32 MB/s transfer rate..... not too bad. I'll have to try it with a EXT3 block device and a Unix computer. Ramuk 01:36, 29 August 2006 (EDT)
  • EXT3 - Slightly dissapointing, however one would have to know what leveraging several of these devices together would get you. Using my ubuntu laptop attached via a 100baseT switch, transferring a 300Mb file I got about a 5Mb/s sustained transfer rate. Which does correlate well with Coraid's suggestion of 5-6Mb/s per blade. So 15 of these devices in a Level 5 raid array should produce (14*5*8) = 560MB/s transfer rate, which is about half the bandwidth of a Gigabit 1000MB/s switch. 02:01, 29 August 2006 (EDT)