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?
next prev parent 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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