Has anyone tried setting up a four drive RAID 0+1 on Fedora Core using the installer tools for setting up custom drive partitions? After doing some benchmarks on a new dual quad core Xeon system, it has become apparent that at 8 processors certain calculations that thread well can show a disk i/o bottleneck so it might be worth exploring striping my mirrors with a RAID 0+1. However, I am unclear on how well tested the linux software raid support (and installer setup tools) are for such a configuration. Jack
i'd also be curious to see any responses to this. I can see making two stripes easy enough, but then just how to mirror them as a single device?
On Mon, 26 Feb 2007, Jack Howarth wrote:
Has anyone tried setting up a four drive RAID 0+1 on Fedora Core using the installer tools for setting up custom drive partitions? After doing some benchmarks on a new dual quad core Xeon system, it has become apparent that at 8 processors certain calculations that thread well can show a disk i/o bottleneck so it might be worth exploring striping my mirrors with a RAID 0+1. However, I am unclear on how well tested the linux software raid support (and installer setup tools) are for such a configuration. Jack
On Wed, 2007-02-28 at 23:56 -0800, Justin Zygmont wrote:
i'd also be curious to see any responses to this. I can see making two stripes easy enough, but then just how to mirror them as a single device?
On Mon, 26 Feb 2007, Jack Howarth wrote:
Has anyone tried setting up a four drive RAID 0+1 on Fedora Core using the installer tools for setting up custom drive partitions? After doing some benchmarks on a new dual quad core Xeon system, it has become apparent that at 8 processors certain calculations that thread well can show a disk i/o bottleneck so it might be worth exploring striping my mirrors with a RAID 0+1. However, I am unclear on how well tested the linux software raid support (and installer setup tools) are for such a configuration. Jack
Justin,
maybe this would help to understand. It's for etherblades, allright but the principle is the same.
http://www.coraid.com/support/linux/EtherDrive-2.6-HOWTO-4.html
Calin
================================================= Typo in the code
On Wed, Feb 28, 2007 at 23:56:28 -0800, Justin Zygmont jzygmont@solarflow.net wrote:
i'd also be curious to see any responses to this. I can see making two stripes easy enough, but then just how to mirror them as a single device?
It isn't hard to stack raid devices with mdadm, but I don't think Fedora will create them during installs. So you would have to set them up before doing the install.
Also, it is normally better to mirror first and then lay down stripes over the mirrors. That allows you to survive more 2 drive failures than if you mirror stripes.
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Bruno Wolff III -
Jack Howarth -
Justin Zygmont -
kalinix