Date: Fri, 28 Mar 2008 01:26:08 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: Question about file system checks Message-ID: <fshdv1$jbt$1@ger.gmane.org> In-Reply-To: <200803280029.08136.danny@ricin.com> References: <47EBA3AB.40307@infracaninophile.co.uk> <f9ae3129fa235b31251ec97bc12c1e78@localhost> <200803280029.08136.danny@ricin.com>
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[-- Attachment #1 --] Danny Pansters wrote: > Generally I can say that with freebsd even if you pull the plug and then let > it reboot and do the automatical background fsck you'll likely loose only > that one file you might have been editing while (or just before) you > unplugged the box. Stress testing I've done suggests otherwise :) I've literally repeatedly pulled the plug of a server in a controlled environment, and with a network logging of (a high load of) file system operations. My results show that UFS+SU and ZFS on FreeBSD loose *the most* files (and in case of UFS+SU especially directories), than any of: jfs, xfs, reiser3 (on Linux 2.6.22) and NTFS (on Windows 2003 Server). ext3 is somewhat similar to UFS+SU, though about 30% better at not loosing files. Some other notes from this proceeding: 1. UFS+gjournal looses the least, but it's also the slowest. 2. UFS+SU had no truncated files or files of unexpected length (apparently it just looses the file that would end up in this state) 3. XFS and JFS end up with a *huge* number of files that are truncated or of unexpected length (40%-50%!) 4. In no case has any of the above file systems gone completely corrupted or lost any of the files/directories not being updated. 5. ZFS on FreeBSD was the fastest, in the sense of creating the most files during this benchmark (though speed was not the target for this benchmark so this is a low-quality observation), closely followed by JFS and XFS. 6. ZFS crashed the kernel at least once. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFH7DsgldnAQVacBcgRAg25AJ9A4AaWubVe6sRJJmEBEJi5SY1WtACg4kkg +g2nNprGQR4OUCCJmfXOP7I= =0Cnn -----END PGP SIGNATURE-----
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