From: Wil Reichert <wil.reichert@gmail.com>
To: Steven Haigh <netwiz@crc.id.au>
Cc: linux-raid@vger.kernel.org
Subject: Re: Disk I/O error while rebuilding an md raid-5 array
Date: Mon, 8 Feb 2010 22:37:31 -0600 [thread overview]
Message-ID: <7a329d911002082037y704ea1asa678270928b2253a@mail.gmail.com> (raw)
In-Reply-To: <614f278c776be50b11520bfd3e2168ae@localhost>
On Mon, Feb 8, 2010 at 10:26 PM, Steven Haigh <netwiz@crc.id.au> wrote:
> 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...
Good point, I was using bs=1M.
Wil
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next prev parent reply other threads:[~2010-02-09 4:37 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
2010-02-09 4:37 ` Wil Reichert [this message]
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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