Re: raid10??
randall wrote:
> Héctor González wrote:
>
>> With mdadm you can make RAID10, is there a problem here I just don't see?
>>
>> my mdadm.conf has this for one server with 4 500GB disks, md0 is 1 TB.
>>
>> ARRAY /dev/md0 level=raid10 num-devices=4
>> UUID=9fbd86dc:518e4bf3:c0ae5f04:5c65c500
>>
>>
>> Roberto C. Sánchez wrote:
>>
>>> On Tue, Jan 29, 2008 at 05:23:25AM +0100, randall wrote:
>>>
>>>
>>>> i have just installed with the debian installer making 2 x raid1 and
>>>> then glueing them together with LVM
>>>> 256 MB /boot raid 1 (on all 4 disks)
>>>> 10 GB /root raid1 + lvm
>>>> 1 GB /swap raid1 + lvm
>>>> 500 GB unused raid1 + lvm
>>>>
>>>> (i wasn't very sure what to do about the swap but i think this means
>>>> slower but securer in a case of crashing)
>>>>
>>>> till so far the performance feels pretty snappy but i still have to do
>>>> some benchmarking and remove a few random disks to see what happens.
>>>>
>>>> anybody ever reliably used a set up like this in production?
>>>>
>>>>
>>>>
>>> I run a similar setup on many production servers. On one, for example,
>>> I have four disks. I create two RAID1 arrays, /dev/md0 and /dev/md1.
>>> Then I create a LVM volume group, adding both /dev/md0 and /dev/md1 as
>>> physical volumes. Then I create whatever logical volumes I want. It
>>> works very well.
>>>
>>> Regards,
>>>
>>> -Roberto
>>>
>>>
>>>
>>
> no problem, just some time left to try out different options ;)
>
> and i was just about to try that way, any pointers about the install you
> are willing to share?
>
> should be something as follows i figured, can you include /boot this way?
>
> sfdisk -d /dev/hda | sfdisk /dev/hdb etc......
>
> mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sd[ab]1
> mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sd[cd]1
> mdadm --create /dev/md2 --level=0 --raid-devices=2 /dev/md[01]
>
>
>
>
Well, if memory doesn't fail, I just did something like:
mdadm --create /dev/md0 --level=raid10 --raid-devices=4 /dev/sd[bcde]1
I don't boot currently from that raid, but it should work fine, if you
told the mdadm package to include boot raid support.
--
Hector Gonzalez
cacho@genac.org
http://www.genac.org
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