From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hugo Mills Subject: Re: btrfs w/ckd Date: Thu, 2 Jun 2011 20:59:56 +0100 Message-ID: <20110602195956.GC8002@carfax.org.uk> References: <47C68B986D117D40A7E109AE2FC85C291128DB4A12@MX01A.corp.emc.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="/e2eDi0V/xtL+Mc8" Cc: linux-btrfs@vger.kernel.org To: kathleen.hodge@emc.com Return-path: In-Reply-To: <47C68B986D117D40A7E109AE2FC85C291128DB4A12@MX01A.corp.emc.com> List-ID: --/e2eDi0V/xtL+Mc8 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Jun 02, 2011 at 03:45:07PM -0400, kathleen.hodge@emc.com wrote: > Hello, > I'm trying to use mod3 ckds which are already RAID10 protection. (most of the doc I'm looking at uses fba instead of ckd, so I didn't know if this was a limitation) > I'm addressing the head device and able to use these devices with no problem as ext3. I've been reading that cache may remember that it used to be ext3, so I detached and reattached, but get the same result when trying to mount after formatting. > > I use the following to make the file system after I've attached, varied online, formated and partitioned (also tried without the journaling switch). > mke2fs -j -t btrfs /dev/dasdbj1 Quoting the man page for that command: "mke2fs is used to create an ext2, ext3, or ext4 filesystem, [...]" The -t option specifies which of ext2, ext3, and ext4 to create. I'm surprised it did anything at all given a type of "btrfs"... You probably wanted mkfs.btrfs instead: # mkfs.btrfs -d single -m single /dev/dasdbj1 > Then the mount command: > mount -t btrfs /dev/dasdbj1 /home/sdasd/d01 > mount: /dev/dasdbj1: can't read superblock If it created an ext2/3/4 filesystem, I'm not entirely surprised that it can't find a btrfs superblock there. :) Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- We teach people management skills by examining characters in --- Shakespeare. You could look at Claudius's crisis management techniques, for example. --/e2eDi0V/xtL+Mc8 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iD8DBQFN5+u8IKyzvlFcI40RApK6AJ42pPJ4Yre0CA3Vh8S+m29AWgJkwwCgnhJj G8cdW/Kye6iwx9EZ4ioHBi4= =lDdr -----END PGP SIGNATURE----- --/e2eDi0V/xtL+Mc8--