Date: Wed, 24 Jun 2009 02:28:21 -0700 (PDT) From: Simun Mikecin <numisemis@yahoo.com> To: rihad <rihad@mail.ru> Cc: freebsd-fs@freebsd.org Subject: Re: Is it preferable to use the sync command? Message-ID: <130804.21855.qm@web37303.mail.mud.yahoo.com> In-Reply-To: <4A41E073.70902@mail.ru> References: <4A41E073.70902@mail.ru>
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rihad wrote:
> Having experienced a FreeBSD 5.1 crash due to power failure (despite using a UPS) resulting in massive /etc corruption and data loss, in order to minimize future risks should I:
> 0) tweak (decrease) these default sysctls:
> kern.filedelay: 30
> kern.dirdelay: 29
> kern.metadelay: 28
> 1) mount the root FS with soft-updates enabled (left as disabled in sysinstall by default due to known reasons)
> 2) setup a cron job calling /bin/sync every minute
> I somehow feel that turning soft-updates on would do the trick (it is not normally written to and has plenty of free space anyway).
Do you use ATA or SCSI?
Turning soft-updates on for SCSI should do the trick.
Since there is no support for gjournal and/or ZFS on 5.1, for ATA only real solution would be disabling write-cache (which degrades performance): "sysctl hw.ata.wc=0".
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