From mboxrd@z Thu Jan 1 00:00:00 1970 From: Johannes Truschnigg Subject: Re: HBA Adaptor advice Date: Sun, 22 May 2011 23:13:39 +0200 Message-ID: <4DD97C83.4050907@truschnigg.info> References: <4DD50C89.8060006@wildgooses.com> <20110520020853.GC4759@bitfolk.com> <4DD61948.8050302@wildgooses.com> <4DD6409F.9070904@hardwarefreak.com> <4DD79F4E.7000509@wildgooses.com> <4DD8D1A7.1090803@hardwarefreak.com> <4DD8E0D3.1030905@fnarfbargle.com> <4DD9633E.5000101@hardwarefreak.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig8965803BC1DA7ECEE7E78986" Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Tobias McNulty Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig8965803BC1DA7ECEE7E78986 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 05/22/2011 10:57 PM, Tobias McNulty wrote: > Case in point: I have 4 of these 2TB Green drives in a RAID5 array. I > assembled them from the raw devices (no partition table) without any > special precautions. Am I in trouble? The array seems to be working > fine... No, you aren't. If you don't create a partition table in the first place, there's no possibility for partition boundaries to be mis-aligned in regard to the physical sector or erase block size of the underlying blockdevice. You could probably still get it wrong if you chose (if that's even possible, I don't know for sure off-hand) a very weird non-power-of-two chunk size that happens to interfere with the sector size of your disks in a bad way, but since md's default chunk sizes are rather large powers of two, you'd have to put some effort into screwing up (if that is at all possible, as I mentioned before) ;) --=20 with best regards: - Johannes Truschnigg ( johannes@truschnigg.info ) www: http://johannes.truschnigg.info/ phone: +43 650 2 133337 xmpp: johannes@truschnigg.info Please do not bother me with HTML-eMail or attachments. Thank you. --------------enig8965803BC1DA7ECEE7E78986 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ iEYEARECAAYFAk3ZfIYACgkQnnUApj8OcoK8tgCgkDUEt2q6txcM46oRh1LFGHOw U3MAnREVZCWcV80pabLp4+eETIavANrd =w5Nt -----END PGP SIGNATURE----- --------------enig8965803BC1DA7ECEE7E78986--