Re: Building RAID5 w/o a Hot Spare

["Michał Sawicz" <michal@sawicz.net>]

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Dnia 2010-01-27, śro o godzinie 09:41 -0500, Carlos Williams pisze:
> 2010/1/27 Michał Sawicz <michal@sawicz.net>:
> > I'm not sure I understand what you want to achieve. A 'spare' disk
> is
> > one that isn't used until any of the other fail, then the spare
> replaces
> > the failed one. The term 'hot spare' is used to identify a disk that
> is
> > a mirror of one of the other drives, but there's no support for that
> in
> > Linux Software-RAID.
> 
> I am sorry because I think I was using the wrong terminology then. I
> want to use all 4 disks to be an active member or the RAID5 /dev/md0.
> I wanted to make sure the command I posted in my original post was not
> going to use 3 partitions for active members of RAID5 on /dev/md0 and
> use the 4th drive as a 'spare device' in case one of the three drives
> fail. I don't want that. I just want 4 active / working devices for
> /dev/md0.
> 
> >> mdadm --create /dev/md0 --level=5
> --raid-devices=4 /dev/sda2 /dev/sdb2
> >> /dev/sdc2 /dev/sdd2
> >
> > This will create a RAID5 array of 4 devices, yes. Capacity will be 3
> x
> > sd?2. Failure of any one of those disks will not harm the data.
> 
> OK. I think that answers my questions. Thanks for your help!

Great.

Please keep the mailing list in the loop.

-- 
Cheers
Michał (Saviq) Sawicz

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