[CentOS] Using CentOS 7 to attempt recovery of failed disk

2020-09-26 Thread Jerry Geis
I have a disk that is flagging errors, attempting to rescue the data. I tried dd first - if gets about 117G of 320G disk and stops incrementing the save image any more. Now I'm trying ddrescue and it also stops about the same point Thoughts on how to continue past that point ? Thanks, Jerry ___

Re: [CentOS] Using CentOS 7 to attempt recovery of failed disk

2020-09-26 Thread Valeri Galtsev
> On Sep 26, 2020, at 8:05 AM, Jerry Geis wrote: > > I have a disk that is flagging errors, attempting to rescue the data. > > I tried dd first - if gets about 117G of 320G disk and stops incrementing > the save image any more. did you try dd conv=noerror … this flag makes dd not stop on in

Re: [CentOS] Using CentOS 7 to attempt recovery of failed disk

2020-09-26 Thread Fred
Also, does ddrescue "stop" (as in quit) or is it just stuck there spending a lot of time trying to read one or more bad spots? it is intended to keep trying until it gets something, or gives up and skips to the next track/sector/whatever. If you let it go for a long time (overnight???) does it proc

Re: [CentOS] Using CentOS 7 to attempt recovery of failed disk

2020-09-26 Thread Jerry Geis
Hello I did try the "dd conv=noerror …" The ddrescue - doesnt stop - it just doesnt "continue" past a certain point. Somewhere around the 117G mark - it just doesnt go past that . (same with dd, gets to 117G and just doesnt continue. I have let the dd run all night - did not go past the 117G. Tha

Re: [CentOS] Using CentOS 7 to attempt recovery of failed disk

2020-09-26 Thread Fred
Well, I'm not a noted expert on ddrescue, but my limited experience tells me that when it hits bad spots (or a big cluster of them) it can go very slowly as it tries multiple times to read each sector (or track, I'm not sure which, in this case). It keeps a list of bad spots and goes back at the en

Re: [CentOS] Using CentOS 7 to attempt recovery of failed disk

2020-09-26 Thread Erick Perez - Quadrian Enterprises
I will suggest using dmesg -w to monitor during dd the sector numbers that fail in order to skip them. Also, perhaps the timeout of each read error is killing you (default 30 seconds) and you may have thousands. On linux, /sys/block//device/timeout (such as /sys/block/sda/device/timeout) is the t

Re: [CentOS] Using CentOS 7 to attempt recovery of failed disk

2020-09-26 Thread Robert Nichols
On 9/26/20 12:40 PM, Jerry Geis wrote: Hello I did try the "dd conv=noerror …" The ddrescue - doesnt stop - it just doesnt "continue" past a certain point. Somewhere around the 117G mark - it just doesnt go past that . (same with dd, gets to 117G and just doesnt continue. I have let the dd run a