Date: Mon, 22 Aug 2011 16:39:47 +1000 From: Peter Jeremy <peterjeremy@acm.org> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org Subject: Re: bad sector in gmirror HDD Message-ID: <20110822063947.GA47945@server.vk2pj.dyndns.org> In-Reply-To: <20110820032438.GA21925@icarus.home.lan> References: <1B4FC0D8-60E6-49DA-BC52-688052C4DA51@langille.org> <20110819232125.GA4965@icarus.home.lan> <B6B0AD0F-A74C-4F2C-88B0-101443D7831A@langille.org> <20110820032438.GA21925@icarus.home.lan>
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--Nq2Wo0NMKNjxTN9z Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2011-Aug-19 20:24:38 -0700, Jeremy Chadwick <freebsd@jdc.parodius.com> w= rote: >The reallocated LBA cannot be dealt with aside from re-creating the >filesystem and telling it not to use the LBA. I see no flags in >newfs(8) that indicate a way to specify LBAs to avoid. And we don't >know what LBA it is so we can't refer to it right now anyway. > >As I said previously, I have no idea how UFS/FFS deals with this. It doesn't. UFS/FFS and ZFS expect and assume "perfect" media. It's up to the drive to transparently remap faulty sectors. UFS used to have support for visible bad sectors (and Solaris UFS still reserves space for this, though I don't know if it still works) but the code was removed from FreeBSD long ago. AFAIR, wd(4) supported bad sectors but it was removed long ago. --=20 Peter Jeremy --Nq2Wo0NMKNjxTN9z Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAk5R+bMACgkQ/opHv/APuIcr+QCfdoAHKdGbslWCHdxMK0NjSvLk a1gAn2vu2KSaN229Xi+eSK/vkbWlKlQC =WoHk -----END PGP SIGNATURE----- --Nq2Wo0NMKNjxTN9z--
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