Date: Mon, 3 Sep 2001 23:48:27 +0200 (CEST)
From: Seth Mos <knuffie@xs4all.nl>
To: "Gonyou, Austin" <austin@coremetrics.com>
cc: "'XFS mailing list'" <linux-xfs@oss.sgi.com>
Subject: RE: System lock while accessing files causes file corruption
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On Mon, 3 Sep 2001, Gonyou, Austin wrote:

> All,
>    Thanks so much for your input on this and not flaming the living
> daylights out of me. The info I've gathered here from everyone's feedback is

You have to give me a good reason first. Since my new laptop arived I
don't really care ;-)

> sure enough to be good armament should I run into problems helping people
> understand things. Knowing the reality of things vs. "facts" is very
> important. Thank you all again for your help. 

You're welcome

> 
> -- 
> Austin Gonyou
> Systems Architect, CCNA
> Coremetrics, Inc.
> Phone: 512-796-9023
> email: austin@coremetrics.com 
> 
> > -----Original Message-----
> > From: Seth Mos [mailto:knuffie@xs4all.nl]
> > Sent: Monday, September 03, 2001 3:56 PM
> > To: Gonyou, Austin
> > Cc: 'XFS mailing list'
> > Subject: RE: System lock while accessing files causes file corruption
> > 
> > 
> > On Mon, 3 Sep 2001, Gonyou, Austin wrote:
> > 
> > > One quick not on this, is there anything I can do kernel 
> > wise to prevent
> > > this without striking a crapload of overhead on the system?
> > 
> > No, all metadata journaling filesystems have this. ReiserFS 
> > has it and I
> > suspect that JFS can do this as well. If I ever get the NCR 
> > MP-RAS box to
> > be out of production I could test this with Veritas as well.
> > 
> > I hate to say it but this a general metadata jfs 
> > problem/feature. It needs
> > a smarter kernel to make it go to disk faster when the box is 
> > not loaded.
> > 
> > > > -----Original Message-----
> > > > From: Gonyou, Austin 
> > > > Sent: Monday, September 03, 2001 12:41 PM
> > > > To: 'Seth Mos'; Gonyou, Austin; XFS mailing list
> > > > Subject: RE: System lock while accessing files causes 
> > file corruption
> > > > 
> > > > 
> > > > That's all well and good..but what about the configuration 
> > > > files? They are text and are not redundant in the same way. I 
> > > > know it's been done to death..and I've read a lot of this 
> > > > stuff, but even after making thanges, etc, especially if I 
> > > > use logbufs > 2, I can make this happen at will. That's why 
> > > > I've got concerns. I know about the points Keith made, and 
> > > > very valid in this case especially, but my major concern is 
> > > > deploying a TB size db only to get taken down that my configs 
> > > > are messed up. (yes, I know that's what backups and CVS are 
> > > > for) but that's not acceptable when talking about my primary 
> > > > FS. I'm going to go through as many iterations of this as I 
> > > > can to see if I can narrow down exactly what and where, what 
> > > > hardware, etc. We're about to do a major deployment and I'm 
> > > > just trying to do due dilligence, beyond the FAQ and random 
> > > > mails. Thanks for listening, and this can certainly come 
> > > > off-list if you feel that's best. I really don't want to beat 
> > > > a dead horse anymore than I have to. Assurance of success in 
> > > > this respect is very important. We don't have a lot of 
> > > > storage to throw around. 
> > > > 
> > > > -- 
> > > > Austin Gonyou
> > > > Systems Architect, CCNA
> > > > Coremetrics, Inc.
> > > > Phone: 512-796-9023
> > > > email: austin@coremetrics.com 
> > > > 
> > > > > -----Original Message-----
> > > > > From: Seth Mos [mailto:knuffie@xs4all.nl]
> > > > > Sent: Sunday, September 02, 2001 7:18 PM
> > > > > To: Gonyou, Austin; XFS mailing list
> > > > > Subject: Re: System lock while accessing files causes file 
> > > > corruption
> > > > > 
> > > > > 
> > > > > At 18:16 2-9-2001 -0500, Gonyou, Austin wrote:
> > > > > >Why is this? If I open a file, text/otherwise and the power 
> > > > > actually fails,
> > > > > >(i turn it off), once in a while I get a corrupt file. Why 
> > > > > is this? What
> > > > > >would happen if I was writing to some Oracle filesystems and 
> > > > > this situation
> > > > > >occurred? Please advise.
> > > > > 
> > > > > See the http://oss.sgi.com/projects/xfs/faq.html#nulls
> > > > > 
> > > > > A database would survive since most have their own 
> > buffering and 
> > > > > transaction scheme.
> > > > > 
> > > > > 
> > > > > --
> > > > > Seth
> > > > > Every program has two purposes one for which
> > > > > it was written and another for which it wasn't
> > > > > I use the last kind.
> > > > > 
> > > > 
> > > 
> > > 
> > 
> 
>