Date: Sun, 1 May 2005 07:39:06 -0500 From: "antenneX" <antennex@swbell.net> To: "Alan Horn" <ahorn@deorth.org>, <freebsd-questions@freebsd.org> Subject: Re: question about mksnap_ffs and NFS interaction Message-ID: <023201c54e4a$c40a8f60$0200000a@SAGEAME> References: <Pine.NEB.4.60.0505010340150.14768@slick.sigje.org>
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----- Original Message ----- From: "Alan Horn" <ahorn@deorth.org> To: <freebsd-questions@freebsd.org> Sent: Sunday, May 01, 2005 5:44 AM Subject: question about mksnap_ffs and NFS interaction > > Folks, > > I have some NFS exported filesystems (home directories) that I'm placing > under snapshots. > > Timing of making a snapshot on a 140GB filesystems running about 90% full > takes about 17 seconds. > > Given that these filesystems are fairly heavily used homedir filesystems, > what is the expected impact of those 17 seconds on NFS clients. > > My guess is that its enough to be seen but not enough to cause NFS > timeouts. So far I've been scheduling snapshots for the middle of the > night, but I'd like to start doing four per day. Does anyone have any data > on the likely impact ? > > Please reply direct to me as I'm not subbsed to the list. > > Cheers, > > Al > Glad to see a question on this subject and my reply is just more questions rather than an answer. I've just moved to 5.4RC3 & read most of the docs and this snap issue is new to me too. Howe are you scheduling? I noticed I never got a snapshot until I ran the command to do snaps on each FS. So, I scheduled one for "noon" as a cron job. Now I get a regular "snap" plus the "nooner", but they show a random time & both done about the same time. A mystery to me so far... sure like the new snap feature though.
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