From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: RAID 10 far and offset on-disk layouts Date: Mon, 13 Jan 2014 10:20:21 +1100 Message-ID: <20140113102021.1ef3e203@notabene.brown> References: <52BD8EDD.10809@assyoma.it> <20131227151927.GA4003@www5.open-std.org> <52BD9B4F.3000509@assyoma.it> <20131227154952.GA6539@www5.open-std.org> <52CE57D9.1030501@assyoma.it> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/TT9gHQh_heeX7uQVxHAFFRA"; protocol="application/pgp-signature" Return-path: In-Reply-To: <52CE57D9.1030501@assyoma.it> Sender: linux-raid-owner@vger.kernel.org To: Gionatan Danti Cc: linux-raid@vger.kernel.org, keld@keldix.com List-Id: linux-raid.ids --Sig_/TT9gHQh_heeX7uQVxHAFFRA Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Thu, 09 Jan 2014 09:03:37 +0100 Gionatan Danti wrot= e: > >> > >> Interesting. Two question: > >> 1) from which kernel the layout is the one depicted by Wikipedia? Exactly what depiction in wikipedia are you referring to? A link to the image might help. > >> 2) it is possible, using mdadm, check what "far" layout is in use? mdadm --detail /dev/mdWHATEVER | grep Layout > > > > I cannot answer that. Neil Brown should know. > > > > Best regards > > Keld > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > >=20 > Hi all, > anyone with an update on these two questions? >=20 > I was thinking to use the kernel block trace facility to track disk=20 > access and infer the on-disk data structure, but I haven't tried for now. >=20 > On the other hand, I carefully looked at mdadm output, without finding=20 > anything related to physical block placing. Look for "Layout". NeilBrown >=20 > Any new advices on that regard? > Thanks. >=20 --Sig_/TT9gHQh_heeX7uQVxHAFFRA Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIVAwUBUtMjNTnsnt1WYoG5AQJlcA//dmUG+lpb4UqjueS0KyGjj1YOFlUiQ0S3 m0FIb2PZAe66o5/48Uk3m5m0URpgH8xsLn8iXTWn3NHGGkN5Hj9JwlVJdqV8/xxI BYSx+R0rDGfJXPKyclJrf/YWnzvPhpe1+JDJB4qj9+TUznMoK6qC9osstDp2CQc9 SmqGbADALFyxqvfcyt/O85cDfHvxmeg/9NJfzWNBKrT0Ed//nmmloYyrD9ZhKkvW 4ca5Ky+BIKrKXzgaYnUCkZxcXzDhS+5jBYxgbPei1RcNMQ/WvEhf9JxT+NdZWW6f ySh5jZ8Qto24oREf5l+N8ZhiM1q+ThQclZO5aM/DjC2LW2E/IfiF+WMtfDU2YjEF WGiqOGmX5tX7nTtjyr8vYUXnNRQb7rGc9EO/dbBpti7SmWavlhw6odPEM6Fk0Blf gUEzvpKwdB8tV+vp1KSb64qfRbMo7aGNAD/jyCSBHJXO+s9+UWRl0EJ7a9jmtRd9 ntsDtO3hxa2uLr6viNDPPFbVfzTl0m+Bztn+Ea9c1+P2peiYFfb6tnlholcFibit sunLV+wSfqjCmwYDfuzd211xXLWnyJcsmolvlVFyyJjnMVsflre2W21HRLVq+QOw jHJp6ZfVMx5Sr2uhFmal7wtzCxULmxY2ZwJcH39GzajYTo9xZOaZnB+sZum8Og9K MsmuI76b+9A= =IxSI -----END PGP SIGNATURE----- --Sig_/TT9gHQh_heeX7uQVxHAFFRA--