From: Steven Haigh <netwiz@crc.id.au>
To: linux-raid@vger.kernel.org
Subject: Re: Disk I/O error while rebuilding an md raid-5 array
Date: Tue, 09 Feb 2010 15:26:32 +1100 [thread overview]
Message-ID: <614f278c776be50b11520bfd3e2168ae@localhost> (raw)
In-Reply-To: <7a329d911002082024j50fba7fcq717fe03d00209533@mail.gmail.com>
On Mon, 8 Feb 2010 22:24:09 -0600, Wil Reichert <wil.reichert@gmail.com>
wrote:
> On Mon, Feb 8, 2010 at 7:23 PM, Dawning Sky <the.dawning.sky@gmail.com>
> wrote:
>> On Mon, Feb 8, 2010 at 3:23 PM, Dawning Sky <the.dawning.sky@gmail.com>
>> wrote:
>>> It appears clonezilla is using dd and the speed is extremely
>>> slow (~5MB/sec) and it says it's gonna take 1 day to clone the 500GB.
>>
>> BTW, is it normal for dd to be this slow, or is there something wrong
>> with my setup? These are quite modern drives and should be able to
>> handle sequential transfer of 10's of MB/s. I have never used dd
>> before so I don't have any experience.
>
> dd should be pretty close to the max possible throughput of yer drive.
> For example, I dd'd a 1T WD black not too long ago & it was around
> 120MB/s on the outside & 70MB/s in the middle.
I think this depends more on the block size that is used. 1MB block sizes
are much faster than 512 byte blocks...
--
Steven Haigh
Email: netwiz@crc.id.au
Web: http://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299
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next prev parent reply other threads:[~2010-02-09 4:26 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-08 23:23 Disk I/O error while rebuilding an md raid-5 array Dawning Sky
2010-02-09 0:04 ` Greg Freemyer
2010-02-09 0:45 ` Dawning Sky
2010-02-09 10:22 ` Jon Hardcastle
2010-02-09 11:57 ` John Robinson
2010-02-09 17:43 ` Dawning Sky
2010-02-09 19:28 ` Mikael Abrahamsson
2010-02-09 1:23 ` Dawning Sky
2010-02-09 4:24 ` Wil Reichert
2010-02-09 4:26 ` Steven Haigh [this message]
2010-02-09 4:37 ` Wil Reichert
2010-02-09 4:20 ` Dawning Sky
2010-02-09 6:57 ` Stefan Hübner
2010-02-09 7:39 ` Dawning Sky
2010-02-09 8:05 ` Mikael Abrahamsson
-- strict thread matches above, loose matches on Subject: below --
2010-02-09 0:25 russ
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