Hi,

> > Engine reports the block size reported by vdsm. Once we get the system
> > up with your 4k storage domain,
> > we can check that engine reports the right value and update it if needed.
> > I think what you should do is:
> > 
> > 1. Backup storage domain metadata
> > /path/to/domain/domain-uuid/dom_md
> > 
> > 2. Deactivate the storage domain (from engine)
> > 
> > 3. Edit the metadata file:
> > - change BLOCK_SIZE to 4096
> > - delete the checksum line
> > (_SHA_CKSUM=9dde06bbc9f2316efc141565738ff32037b1ff66)
> > 
> > 4. Activate the domain
> > 
> > With vdsm < 4.3.6, the domain should be active, ignoring the block size.
> > 
> > 5. Upgrade back to 4.3.6
> > 
> > The system should detect the block size and work normally.
> > 
> > 6. File ovirt bug for this issue
> > 
> > We need at least to document the way to fix the storage domain manually.
> > 
> > We also should consider checking storage domain metadata during
> > upgrades. I think it will be
> > a better experience if upgrade will fail and you have a working system
> > with older version.
> 
> I've tried this procedure and it has worked! Thanks!
> 
> If you would like me to file a bug, which component should I log it against?

for vdms. Please include all the logs and db dump as Nir mentioned in previous 
email (see bellow).
Thanks

> >>     
> >>     Please share more data so we can understand the failure:
> >>     
> >>     - complete vdsm log showing the failure to activate the domain
> >>       - with 4.3.6
> >>       - with 4.3.5 (after you downgraded
> >>     - contents of
> >>     /rhev/data-center/mnt/_<domaindir>/domain-uuid/dom_md/metadata
> >>       (assuming your local domain mount is /domaindir)
> >>     - engine db dump
> >>     

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