On Nov 10, 7:22am, "Neil F Brown" wrote:
} Subject: Re: [ANNOUNCE] mdadm-3.1 has been withdrawn
Good morning to everyone, hope the week is progressing well.
> On Tue, November 10, 2009 1:39 am, Doug Ledford wrote:
> > On 11/06/2009 01:45 AM, Neil Brown wrote:
> >>
> >> Greetings.
> >>
> >> About a week ago I released mdadm-3.1
> >> I have now 'withdrawn' it meaning that it doesn't appear on the
> >> kernel.org mirrors any more, and I ask people not to use it.
> >
> > Although the cause for this sucks, I was actually going to suggest that
> > since 3.1 is a version bump, that we take the opportunity to change a
> > few defaults. Like switching to version 1 superblocks instead of
> > version 0 by default. And changing the default chunk size to 512k
> > instead of 64k. The time has simply come for the 0->1 superblock
> > change, and I have a good deal of data showing that for SATA disks at
> > least, the 512k chunk size is the typical sweet spot.
> I had been toying with that idea myself - certainly of changing the
> defaults soon. I'm tempted to make the default metadata "1.1"
> though possibly not for RAID1. For RAID0,4,5,6,10 there is no value
> in having the metadata at the end of the device. For RAID1 there is
> as it makes booting off any member easier. Thoughts?
It may be heresy but I would suggest that if the defaults change we
should also implement support for auto-starting version 1.x devices,
or some appropriate subset of them.
I understand and appreciate the concerns of the userspace start
community. However, we do a lot of storage on very dedicated systems
and I have spent far more time unsnarling systems with blown
initrd/initramfs setups and other boot issues than I have recovering
from starting RAID volumes on the wrong box. Thats why I don't let
udev anywhere near production machines and I am still living on 0.9
metadata in spite of its limitations.
UNIX has always been about allowing people to shoot themselves in the
foot if they so desire. I think an acceptable compromise would be to
move toward a default of disabled auto-detection with the option to
turn on detection of all meta-data types if people choose to do that.
> NeilBrown
Best wishes for a pleasant weekend to everyone.
}-- End of excerpt from "Neil F Brown"
As always,
Dr. G.W. Wettstein, Ph.D. Enjellic Systems Development, LLC.
4206 N. 19th Ave. Specializing in information infra-structure
Fargo, ND 58102 development.
PH: 701-281-1686
FAX: 701-281-3949 EMAIL: greg@xxxxxxxxxxxx
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