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Date:      Sun, 8 Mar 1998 20:21:22 -0700
From:      Nate Williams <nate@mt.sri.com>
To:        Terry Lambert <tlambert@primenet.com>
Cc:        dyson@FreeBSD.ORG, karpen@ocean.campus.luth.se, current@FreeBSD.ORG
Subject:   Re: Okay, -current should be conditionally safe to use
Message-ID:  <199803090321.UAA14280@mt.sri.com>
In-Reply-To: <199803090301.UAA15987@usr08.primenet.com>
References:  <199803080012.TAA00282@dyson.iquest.net> <199803090301.UAA15987@usr08.primenet.com>

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[ NFS performance ]

> > It probably isn't a good idea to use softupdates in production yet.  However,
> > another interesting thing to try is:
> > 
> > sysctl -w vfs.nfs.async=1
> > 
> > on the server.  This is better (safer) than softupdates, but you *can*
> > have data lossage, due to writes not being committed to disk.  It is
> > a good idea to have a UPS when using the above option.
> 
> Note: it is a technical violation of the NFS protocol specification
> for an NFS server to ACK a write which has not been commited to
> stable storage.

Note: Many commercial OS's have this turned on by default, including SUN
at one point.


Nate

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