Date: Wed, 6 Mar 2002 03:19:26 -0600 From: "Mike Meyer" <mwm-dated-1015838366.5272c7@mired.org> To: Brian T.Schellenberger <bts@babbleon.org> Cc: questions@freebsd.org Subject: Re: Softupdates on root in 4.5-RELEASE Message-ID: <15493.57118.414479.492155@guru.mired.org> In-Reply-To: <47615415@toto.iv>
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Brian T.Schellenberger <bts@babbleon.org> types: > On Tuesday 05 March 2002 10:24 am, Burhan Nazir wrote: > > Softupdates will not write any data immediatly to the disk. I believe > > it is about 30 seconds b4 any data actually gets wriiten. This enhances > > disk write speed for certain types of operations. However, there is a > > small risk of data loss/coruption if the machine looses power b4 any data > > was written. For that reason, ppl believe that it is not a good idea to > > have softupdates on the system critical root partition > I think it's more a matter of avoiding it on partitions that are likely to be > rather full and fairly small, since the delay in processing deletes means > that you effectively lose a certain amount of disk space due to processing > time. In particular, "make installkernel" on a system with a default root file system can easily fail because the kernel and modules still haven't been deleted when the you try to do the install. > I personally make the root partition larger and enable soft-updates but > disable write-caching. This seems much safer than the system default way of > doing things to me, but with nearly equal performance. I personally make the root partitoin larger, enable soft updates, and use SCSI disks with proper tagged queuing support so the write cache isn't a problem. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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