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From: Alex Shi <alex.shi@linaro.org>
To: Jan Kara <jack@suse.cz>
Cc: Dmitry Monakhov <dmonakhov@openvz.org>,
	Theodore Ts'o <tytso@mit.edu>,
	Linaro Kernel <linaro-kernel@lists.linaro.org>,
	stable@vger.kernel.org
Subject: Re: a old issue of ext4 on lts 3.10
Date: Wed, 20 May 2015 11:04:31 +0800	[thread overview]
Message-ID: <555BF9BF.90909@linaro.org> (raw)
In-Reply-To: <20150518064146.GC26351@quack.suse.cz>


>    Because the disk driver may be computing checksum of the data before
> submitting it to the disk and if you change the data after the checksum is
> computed but before the DMA transfer is done, the checksum will not match.

Thanks again!
>
>> BTW,
>> how to know if my disk support data integrity. My harddisk spec said it
>> has this feature, but my linux kernel with integrity supported don't
>> have /sys/block/sdx/integrity.
>    The feature you are looking for is called DIF/DIX IIRC and not many disks
> support it.

Oh, that's bad. Looks in block layer will merge or find out the shared 
checksum type. So if 2 kind of different disk in system without share 
checksum type. that could cause each of disk lose data integrity checking?


  reply	other threads:[~2015-05-20  3:04 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-14 14:40 a old issue of ext4 on lts 3.10 Alex Shi
2015-05-14 20:36 ` Dmitry Monakhov
2015-05-17 15:19   ` Alex Shi
2015-05-18  6:41     ` Jan Kara
2015-05-20  3:04       ` Alex Shi [this message]
2015-05-18  6:21   ` Jan Kara
2015-05-20  2:58     ` Alex Shi
2015-05-21  9:28     ` Alex Shi
2015-05-21 16:51       ` gregkh
2015-05-22  8:26         ` Jan Kara
2015-05-24  2:54         ` Alex Shi

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