Date: Thu, 29 Sep 2005 00:46:47 -0700 From: "Loren M. Lang" <lorenl@alzatex.com> To: freebsd-geom@freebsd.org Subject: How can soft-updates assume a certain write order? Message-ID: <20050929074647.GA8081@alzatex.com>
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--tThc/1wpZn/ma/RB Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable How does freebsd gaurentee that meta data is truely written out in the correct order to ensure data integrity? Does freebsd specifically wait for a response to come all the way from the disk drive itself before it schedules any dependent data to be written? And if so, is there any garuntee that any disk controllers, disk drives with their 16 meg caches, raid controllers or anything else won't change that order in an attempt to optimize? Or has the data truely been written to the disk by the time that the response comes back saying that the data's been written? --=20 I sense much NT in you. NT leads to Bluescreen. Bluescreen leads to downtime. Downtime leads to suffering. NT is the path to the darkside. Powerful Unix is. Public Key: ftp://ftp.tallye.com/pub/lorenl_pubkey.asc Fingerprint: CEE1 AAE2 F66C 59B5 34CA C415 6D35 E847 0118 A3D2 =20 --tThc/1wpZn/ma/RB Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFDO5vnbTXoRwEYo9IRAn1nAJ4q2jx1OMTRmVGz+afLVoCihMYOIQCfchTn uVzupRzHaiSEgsKuRUcBg9U= =rMdd -----END PGP SIGNATURE----- --tThc/1wpZn/ma/RB--
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