Igor Fedotov wrote:
> Hi chenhui,
> 
> there is still a work in progress to support multiple labels to avoid 
> the issue (https://github.com/ceph/ceph/pull/55374). But this is of 
> little help for your current case.
> 
> If your disk is fine (meaning it's able to read/write block at offset 0) 
> you might want to try to recover the label using label from a different 
> OSD sitting on a similar(!!that's important!!!) main device. One needs 
> to update osd uuid, whoami and osd_key fields after copying though. Here 
> is the step-by-step procedure:
> 
> 1. Copy OSD label (4K data block at offset 0) from source OSD's main 
> device to the same location on the broken one:
> 
> >   dd if=<source_osd_block_device>
> > of=<target_osd_block_device> count=1  bs=4096

Hi, Igor 

I am repairing the lost label problem. But I have doubt about what's mean 
"similar main device"? Our OSD and disk have a one-to-one relationship, without 
disk partitions. How can I find source_osd_block_device ?

thanks
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