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Re: raid1 issue, somewhat related to recent "debian on big machines"



On Tue, Mar 03, 2009 at 12:26:27PM +0100, Goswin von Brederlow wrote:
> Francesco Pietra <chiendarret@gmail.com> writes:
[snip]

> 
> That is a lot of raids. Have you ever thought about using LVM? The
> different raid1 will mess up each others assumption about the head
> positioning of the component devices. On read the linux kernel tries
> to use the disk with the shorter seek and assumes the head is where it
> left it on the last access. But if one of the other raids used that
> disk the head will be way off.
> 
> I would suggest the following scheme:

this is what I would recommend as well
> 
> sda1 / sdb1 : 100Mb raid1 for /boot (or 1GB for / + /boot)
> sda2 / sdb2 : rest raid1 with lvm
> 
> MfG
>         Goswin
> 
> 
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