On 6/21/2013 3:27 AM, Paul L Daniels wrote:
On Tue, 18 Jun 2013 20:12:32 +1000
Paul L Daniels <[email protected]> wrote:
I have a client 1TB WD 2.5" drive from a portable enclosure
which failed on their system. On start up there's no clanking
or banging ( good sign! ) but it's *incredibly* slow to read,
we're talking a peak of ~15KB/sec and an average of 10KB/sec.
FURTHERING to this... I've noticed that every time I restart ddrescue
I'll get the first 2MB or so in at a much higher rate for a short burst
until it drops back to the ~15KB/sec.
Does ddrescue initialise anything special at the start that could
possibly explain this behaviour?
It's not a time-shift/hiccup transient, because if I put a 1 second
delay between each update it'll transfer it in 32KB blocks/sec until
again it runs in to that ~2MB limit.
Paul.
Are you using the -d option for direct disk access? I have noticed slow
downs like that, but using the direct disk access option seemed to take
care of that and resulted in much faster reads.
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