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Re: install/39697: no raidframe support in sysinst
The following reply was made to PR install/39697; it has been noted by GNATS.
From: Greg Oster <oster%cs.usask.ca@localhost>
Cc: Bernd Ernesti <pr200817%veego.de@localhost>
Subject: Re: install/39697: no raidframe support in sysinst
Date: Tue, 07 Oct 2008 19:42:33 -0600
Bernd Ernesti writes:
> The following reply was made to PR install/39697; it has been noted by GNATS.
> From: Bernd Ernesti <pr200817%veego.de@localhost>
> To: gnats-bugs%NetBSD.org@localhost
> Subject: Re: install/39697: no raidframe support in sysinst
> Date: Sun, 5 Oct 2008 12:08:46 +0200
> On Sun, Oct 05, 2008 at 12:05:04AM +0000, Martin Husemann wrote:
> > On Sat, Oct 04, 2008 at 08:30:00PM +0000, Bernd Ernesti wrote:
> > > sysinst has no obvious option (if at all) to create a raid with
> > > and install the system on it.
> > Not that I disagree with the wish to have more complete support in sysins
> t -
> > just for the record, the unobvious option is:
> > - use the utility menu and run a shell from there
> > - use raidctl to configure your raid set
> Unfortunally this is not so easy.
> IMHO it is missing the fdisk / disklabel part (fstype RAID), which is a requ
> for creating the raid set and the initial setup of the bootloader for a root
> And I'm not sure which stripe size I should use for a raid1 set.
> Greg used a formular on how to calculate it in his mail on current-users at
> the end of August 2008:
> ($stripewidth / 2 * ($disks - 1)) == MAXPHYS
> But it looks like that was an example for a raid5 set, so I'm not sure about
> the '($disks - 1)' part and if it applies to a raid1 set too.
The math works for a RAID 1 set as well -- with MAXPHYS at 64K you want
a stripe width of 128 blocks ...
> > - exit the shell, go back to the sysinst main page and start the install
> > - raid0 (or whatever you created) will now be offered as an install
Even installing to "half a RAID 1 set" would be a step in the right
direction... I'd argue, in fact, that we should only attempt to
support installing to a RAID 1 or half of a RAID 1 set... We can't
boot from RAID 0 or RAID 5, so those could be just ignored for the
purposes of sysinst...
I'm happy to provide whatever support I can towards sysinst installing
to a RAID 1 set...
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