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From: Zhu Yanhai <zhu.yanhai@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: What's the benefit of COW without checksum?
Date: Tue, 26 Jan 2010 15:44:53 +0800	[thread overview]
Message-ID: <977a2be21001252344s2371aa8by1f68dfff186b3747@mail.gmail.com> (raw)

Hi Chris,
According to my understanding, COW in Btrfs services for 1) snapshots
capacities 2) keeping checksum consistent with FS data,
that's why nodatacow implies nodatasum. And COW will still happen for
snapshots even under 'nodatacow'.

So could you please tell me what can we get from COW if not computing
checksum (nodatasum)? That's to say, if some user decides to
disable checksum, do you think it's fine for him to just mount with
'nodatacow'? Or there's still some reason for him to use bare
'nodatasum'?

Thanks & Regards,
Zhu Yanhai

(Resent it again as the previous one was rejected by mailing list for
its contained HTML subpart)

             reply	other threads:[~2010-01-26  7:44 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-01-26  7:44 Zhu Yanhai [this message]
     [not found] <977a2be21001252315w36afcb39v4ba130f6d8e53707@mail.gmail.com>
2010-01-26 19:07 ` What's the benefit of COW without checksum? Chris Mason
2010-01-26 23:44   ` Dipl.-Ing. Michael Niederle

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