Bootstrapping Raid 5 w/GEOM

[Ivailo Tanusheff]

Norberto Meijome <freebsd at meijome.net> 
Sent by: owner-freebsd-questions at freebsd.org
07/21/2005 03:41 PM

To
FreeBSD Questions <freebsd-questions at freebsd.org>
cc

Subject
Re: Bootstrapping Raid 5 w/GEOM






Michael Dale wrote:
> Norberto Meijome wrote:
> 
>> So, should I
>> 1) Boot up with Disc 1, install minimal config, reboot
>> 2) setup GEOM RAID 5 on all the discs ?
>> 3) edit fstab to point to /dev/[what??]/[what else] instead of 
>> /ad0s1[abef] ?
>>
> 
> When I installed GEOM for a RAID 1 setup I did the following:
> 
> Install FreeBSD on ad0
> Boot CD and run fixit mode
> Setup GEOM and change fstab to gm0
> 
> Linky:
> http://dannyman.toldme.com/2005/01/24/freebsd-howto-gmirror-system/

Cheers Michael - that's a great bit of info. Do you know how to do RAID5 ?
I read in

http://www.essenz.com/support/lists/hackers/20040118/69.html

about geom_raid, but it seems to be lost after that.

The other alternative may be to setup a RAID1+0, but that shrinks my 
usable space, and I'm not sure how reliable/advisable it is to do in 
software.

Thanks again,
Beto



It's not possible to use RAID 5 for bootable slice, so I would suggest:
- Create a mirrored slice for the root FS 
- Create a RAID 5 slice for the other FS

I did the same here with vinum. Also as you have 3 disks you can make a 3 
disks mirror for the boot slice. The other option is to make mirror on 2 
disks and on third to put swap :)

Best regards,

Ivailo Tanusheff
Senior System administrator
ProCredit Bank (Bulgaria) AD

tel. +359 2 921 7161
fax +359 2 921 7110
http://www.procreditbank.bg


Disclaimer: The information contained in this message is intended solely 
for the use of individual or entity to whom it is addressed and other 
authorized to receive it. It may contain confidential or legally 
privileged information. If you are not the intended recipient you are 
hereby notified that any disclosure, copying, distribution or taking any 
action in reliance on the contents of this message is strictly prohibited 
and may be unlawful. If you have received this communication in error, 
please notify us immediately by responding to this email and then delete 
it from your system. ProCredit Bank is neither liable for the proper and 
complete transmission of the information contained in this message nor for 
any delay in its receipt.