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Re: Is xfsdump operation atomic?

To: linux-xfs@xxxxxxxxxxx
Subject: Re: Is xfsdump operation atomic?
From: Michael Locher <locher@xxxxxxxxxxxx>
Date: Wed, 24 Nov 2004 09:50:56 +0100
In-reply-to: <38A5E378-3DF4-11D9-9800-000A95BCCB96@xxxxxxxxxxxx>
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Ivan, thanks for commenting on this.

Am 23.11.2004 um 13:12 schrieb  Ivan Rayner:
You seem to be of the opinion that you can't create a backup of a live
filesystem. My guess is that you assume a backup is a strict snapshot in
time of the filesystem -- it isn't.

But it could be... it would be a nice feature to have, tough i am sure it is not trivial to implement.

If a file is removed or created while a xfsdump is running, then it may or may not be included in the dump. This is OK, because in tomorrow night's
incremental backup the file will then be included or removed as
appropriate. If you have a 24hr schedule then you should assume that the cycle starts when xfsdump starts. Anything that happens while xfsdump is
running will be guaranteed to be on the following dump, but if you're
lucky then it will make it in the current dump.

What happens if a large file (eg a multi GB database file) is modified during the dump. Will it be consistent? i.e are write operations allowed on a file when its data is dumped?

Michael


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