Why does dd take so long on my Ultra 60

From: Angelo Alvarez (angelo_at_hawaii.rr.com)
Date: 10/19/04 

Date: 19 Oct 2004 03:33:15 -0700

I am trying to clone a 36GB Seagate ST336704LC using dd. The disk is
starting to fail, so I want to replace it as soon as possible. At
first I tried this:
dd if=/dev/rdsk/c0t1dos2 of=/dev/rdsk/c0t0d0s2 bs=256k.
After about 4 hours, I got tired of waiting and killed the process
(output showed 97740+0 records in and 97740+0 records out. So after
reading several posts regarding block size, I used a bs=8192k. Well,
here I am about 3.5 hours later and it's still going. This system's
SCSI card, as I understand it, has a burst transfer rate of 40MB/s.
The hard drives are capable of 27MB/sec at a minimum. I have cloned
other Ultra 60's with 36GB drives and I don't remember the process
taking nearly as long. What could be the problem? Is it the hard
disk I am cloning?

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  • Why does dd take so long on my Ultra 60
    ... I am trying to clone a 36GB Seagate ST336704LC using dd. ... starting to fail, so I want to replace it as soon as possible. ... The hard drives are capable of 27MB/sec at a minimum. ... disk I am cloning? ...
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