From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Haigh Subject: Re: Disk I/O error while rebuilding an md raid-5 array Date: Tue, 09 Feb 2010 15:26:32 +1100 Message-ID: <614f278c776be50b11520bfd3e2168ae@localhost> References: <7a329d911002082024j50fba7fcq717fe03d00209533@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <7a329d911002082024j50fba7fcq717fe03d00209533@mail.gmail.com> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Mon, 8 Feb 2010 22:24:09 -0600, Wil Reichert wrote: > On Mon, Feb 8, 2010 at 7:23 PM, Dawning Sky > wrote: >> On Mon, Feb 8, 2010 at 3:23 PM, Dawning Sky >> 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 500G= B. >> >> BTW, is it normal for dd to be this slow, or is there something wron= g >> with my setup? =C2=A0These are quite modern drives and should be abl= e to >> handle sequential transfer of 10's of MB/s. =C2=A0I have never used = dd >> before so I don't have any experience. >=20 > dd should be pretty close to the max possible throughput of yer drive= =2E > 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 siz= es are much faster than 512 byte blocks... --=20 Steven Haigh =20 Email: netwiz@crc.id.au Web: http://www.crc.id.au Phone: (03) 9001 6090 - 0412 935 897 =46ax: (03) 8338 0299 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html