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01-16-2008, 01:19 PM
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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. 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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01-16-2008, 01:20 PM
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| Re: Why does dd take so long on my Ultra 60 Angelo Alvarez <angelo@hawaii.rr.com> wrote: > 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 Does iostat -En show any errors against the drive you're trying to copy? What does iostat -xc 5 show as the transfer rate? Scott |
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01-16-2008, 01:20 PM
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| Re: Why does dd take so long on my Ultra 60 Hello Angelo, Angelo Alvarez wrote: > 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? I would check /var/adm/messages, you may be coming up against a block that just simply can't be read and getting SCSI errors, these will show up in the above mentioned log normally. I would copy the file systems over individually using tar or cpio to help narrow down where the problem is on the disk and save what data can be saved. I hope this helps. Regards, Nathan Dietsch |
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