Re: raid1 issue, somewhat related to recent "debian on big machines"
To my dismay, I tried (repeatedly) unsuccessfully to implement the
scheme below on old Tyan S2895 with two dual-opteron and two new
Maxtor 250GB, before moving to the new machine. With the recent amd
installer, I tried to set up (manually) the two partitions on both
disks to set up raid1.
First, I tried with a 0.2GB partition for boot but I found no way to
have lvm for the other partition and where to set the root file
system.
Then, I tried with a 1GB partition but found no way to have it for
both boot and root.
In both cases, the installer claimed to have the root file system.
What I need to have for the compilations of applications are /home
/usr /opt /var /swap. The bad way I used previously, was to start from
these partitions and put each on raid. So I finished with so many
raid#.
thanks
francesco
On Tue, Mar 3, 2009 at 9:52 PM, Alex Samad <alex@samad.com.au> wrote:
> 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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>>
>
> --
> "Perhaps one way will be, if we use military force, in the post-Saddam Iraq the U.N. will definitely need to have a role. And that way it can begin to get its legs, legs of responsibility back."
>
> - George W. Bush
> 03/16/2003
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