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Re: Replaying logs on a different machine

To: linux-xfs@xxxxxxxxxxx
Subject: Re: Replaying logs on a different machine
From: KELEMEN Peter <Peter.Kelemen@xxxxxxx>
Date: Fri, 20 Aug 2004 17:16:12 +0200
In-reply-to: <20040820140257.GA1367@elbereth.noviforum.si>
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* Grega Bremec (grega.bremec@xxxxxxxxxxxx) [20040820 16:02]:

Grega,

> Now, after having had brainstormed for a while, we came to
> the following idea: would it be possible to have xfs_logprint
> dump the transaction logs between event X and event Y from a
> log device set at filesystem creation time, then these logs be
> transferred onto another machine and replayed there somehow ?

As far as I understand, you are talking about two independent
machines here, without a shared storage device.  XFS journals
metadata only, which means changes to file *content* are not
reflected in the log. xfs_logprint(8) would get you metadata
changes only, which are worthless on the other machine without
file data.  Not to mention that xfs_logprint(8) can print the
*actual* log entries only, which means that changes that happened
before a log wrap cannot be "remembered".

Peter

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