From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: RAID6 rebuild stuck Date: Wed, 3 Oct 2012 06:29:07 +1000 Message-ID: <20121003062907.3886b2fd@notabene.brown> References: <20121001112946.GB27455@nsrc.org> <20121002155642.606b2108@notabene.brown> <20121002155633.GC30589@nsrc.org> <506B45C3.4090902@anonymous.org.uk> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/+f1FP+j5+cfBm2Xkz5FHVpC"; protocol="application/pgp-signature" Return-path: In-Reply-To: <506B45C3.4090902@anonymous.org.uk> Sender: linux-raid-owner@vger.kernel.org To: John Robinson Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids --Sig_/+f1FP+j5+cfBm2Xkz5FHVpC Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Tue, 02 Oct 2012 20:51:31 +0100 John Robinson wrote: > On 02/10/2012 16:56, Brian Candler wrote: > > On Tue, Oct 02, 2012 at 03:56:42PM +1000, NeilBrown wrote: > >> Lesson: always do a read test as well as a write test! > > > > And there was me thinking that drives read back data after writing it - > > clearly they do not :-) >=20 > Would it be worth adding a re-read onto the end of the usual read=20 > failure reconstruct-write cycle? What? Read twice? We already read after the write when attempting to fix a failure. I suspect it doesn't do much good though as the data is in cache in the dri= ve. NeilBrown --Sig_/+f1FP+j5+cfBm2Xkz5FHVpC Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQIVAwUBUGtOkznsnt1WYoG5AQIS3w/9Ezr4oWVSBwLCIEUz+zNovvq/0L/XFLjC hfqZa9NDr6g2TIMmdLL79k/rcY1qn/dXiBvlhzBMxWIK7atYS45sTKAvuKqtbvTI 45Xlvp1ln/i0AsKBb4HqQJGEszg0wViQvh4rvGD3XMvRoRfr7R/qDUL/UmSyu7oy mljWopvp58Jy7T+hb2ejmygRTdlEAVZHPfrYVtZZ3rD3a1DdFfrv+v0N7gxrLiGp 3OJ4VoUOLCmE82fBMSR2eR3dbZDGeuQxWgtpK5EhwFfJ9etEmCIVitQBxb67i6oy IkppwUsB12XXMl+ghEJEmtyNXXovSSL+NylVASO8cosRZBw60i0rFqM7etSc1DDn O3B10YNjEgyHH+LHH+bqUrG4AZVHH4YJW34CfO2f2RiuHNGmtGEZNeVTVBkf+XGw H173fjcpVMg7tC0Jf6cCXrlYxf9WC7lGcU4BehFv/VZRtWrSeF0hLx+5/vCgljn5 mcMXpHfWfEt/Um1o/GwW0Rx3zoO72v6XgjgO6j1D7FXImV9utRKGfsKiUVp12W6r ZFObpmBOYyVp9irNBVNeigAd6YiVOrEirH+yrL8K0Ok4p0ZfkPkc3C/6NG89I1j7 38625VZdUQSjJWtlXrOeWdZbN4kRzivUtuZTIuXUai19CV/Y8gP9vJzyxryevqqY mkKHIxaJKFs= =0iHK -----END PGP SIGNATURE----- --Sig_/+f1FP+j5+cfBm2Xkz5FHVpC--