Re: [Bug-ddrescue] DDrescue - assistance

[Majed, Adel]

Hello Antonio,

Please find feedback on your question from our HP support team


Q1: Why are you running ddrescue in reverse mode (backwards)? Reverse mode is 
usually slower
 
When the script was initiated, it was throwing error and we could not proceed 
with the VV recovery:
 
ipos: 37375 MB, non-trimmed: 131072 B, current rate: 63504 kB/s
opos: 37375 MB, non-scraped: 0 B, average rate: 75352 kB/s
non-tried: 10957 GB, errsize: 0 B, run time: 8m 16s
rescued: 37374 MB, errors: 0, remaining time: 1d 16h
percent rescued: 0.33% time since last successful read: 0s
Copying non-tried blocks... Pass 1 (forwards)
ddrescue: Write error: Input/output error        
Hence the '-R option' was used. Which seems to be working fine.
 
Q2: What command line are you using to invoke ddrescue?
 
./ddrescue -f -n -R /dev/tpddev/vv/52 /dev/tpddev/vv/27917 
/common/support/vv52_new.log 
 
Q3: May you compress and send me the mapfile? This will allow me to see the 
distribution of errors in the volume.
 
We have a log files that is saved under /common/support/vv52_new.log
Attached it here.


-----Original Message-----
From: Antonio Diaz Diaz [mailto:address@hidden 
Sent: 07 September 2017 16:43
To: Majed, Adel <address@hidden>
Cc: 'address@hidden' <address@hidden>; Fourie, Craig (Technical Resolution 
Team) <address@hidden>; IJR, Prakash <address@hidden>; Hawthorne, Mike 
<address@hidden>; Pednekar, Utkarsh <address@hidden>
Subject: Re: [Bug-ddrescue] DDrescue - assistance

Hi Majed,

Majed, Adel wrote:
> Thank you very much for reply, the data we are trying to recover 
> required for a very critical health care function.

You are welcome. I'll do my best to help you recover the data.


> HP team looked at upgrading to 1.22, but from what they say, it needed 
> to be compiled on the 3PAR and we can't allow that as we don't know 
> the impact to the array.

I don't think upgrading to 1.22 will help you. I suppose you want to recover 
all the data, and most probably the new features of 1.22 won't help you to do 
it significantly better than 1.21.


> Screen capture of the current DDrescue screen

This shows: "Copying non-tried blocks... Pass 1 (backwards)".

Why are you running ddrescue in reverse mode (backwards)? Reverse mode is 
usually slower.

What command line are you using to invoke ddrescue?
May you compress and send me the mapfile? This will allow me to see the 
distribution of errors in the volume.


Best regards,
Antonio.