Re: [nfsv4] draft-eisler-nfsv4-enterprise-apps-00.txt
Chuck Lever <chuck.lever@oracle.com> Thu, 14 October 2010 16:20 UTC
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From: Chuck Lever <chuck.lever@oracle.com>
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Date: Thu, 14 Oct 2010 12:21:34 -0400
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References: <c8401bdd91b16fd501edd08b5957302c.squirrel@webmail.eisler.com> <20101014160917.GJ24146@fieldses.org>
To: "J. Bruce Fields" <bfields@fieldses.org>
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Subject: Re: [nfsv4] draft-eisler-nfsv4-enterprise-apps-00.txt
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On Oct 14, 2010, at 12:09 PM, J. Bruce Fields wrote: > On Wed, Oct 13, 2010 at 03:40:21PM -0700, Mike Eisler wrote: >> >> (apologies if this a dup) >> >> Margaret Susairaj of Oracle and I (of NetApp) posted this >> internet-draft, which proposes extensions to NFSv4 for >> better support of enterprise applications, such >> as databases. >> >> http://www.ietf.org/id/draft-eisler-nfsv4-enterprise-apps-00.txt >> >> I have requested time at the IETF meeting in Beijing to discuss this. > > Miscellaneous, possibly dumb questions: > > - Can you define "enterprise application" for the purpose of > this draft? > > - INITIALIZE: > - I'm confused by the motivation. So an application is > trying to detect whether an unused section of a file > has been corrupted? Does it even care about > corruption of regions where it hasn't stored any data? > What does data corruption in an unallocated region > even mean? If you care about data corruption, don't > you need additional application-level mechanisms (say, > checksums of some kind) that would render INITIALIZE > unnecessary? I'm sure I'm just missing something; > pointers to literature welcomed. The goal is to look for misplaced writes by applications. In other words, it's a way to detect application software bugs, or inappropriate accesses to files by other applications. On regular disks, you might also look for drive firmware bugs that cause a drive to write data into the wrong sectors. > - Has anyone talked to e.g. linux filesystem people to > figure out support for interfaces necessary for an > application to perform INITIALIZE from a client, > and/or to let an nfs server perform it on a > filesystem? I think these are not necessarily intended for a POSIX-style file system API with a VFS layer. A VFS client implementation might implement these operations via ioctl. But... it might be appropriate for the server to report to clients that it cannot support these features. > - ADVISE ops: the types look almost like those in posix_fadvise, > but not exactly; out of curiosity, why the differences? > > - SESSION_CTL: why is managing an additional sessions more > complicated than implementing SESSION_CTL? And I wonder why the client can't simply terminate a session and negotiate a new one with the new parameters. Increasing the size of the session's slot table while there are still slots in use might be kind of interesting to implement. -- chuck[dot]lever[at]oracle[dot]com
- [nfsv4] draft-eisler-nfsv4-enterprise-apps-00.txt Mike Eisler
- Re: [nfsv4] draft-eisler-nfsv4-enterprise-apps-00… J. Bruce Fields
- Re: [nfsv4] draft-eisler-nfsv4-enterprise-apps-00… Chuck Lever
- Re: [nfsv4] draft-eisler-nfsv4-enterprise-apps-00… J. Bruce Fields