Re: 15 pg_upgrade with -j

On 5/23/23 12:19, Peter J. Holzer wrote:
> On 2023-05-22 21:10:48 -0500, Ron wrote:
>> On 5/22/23 18:42, Tom Lane wrote:
>>> It looks like the assumption was that issuing link()
>>> requests in parallel wouldn't help much but just swamp your disk
>>> if they're all on the same filesystem.
>>> Maybe that could use rethinking, not sure.
>> It does need rethinking in the era of VMs and SANs. /var/lib/pgsql/15 is
>> going to be on a different LUN from /var/lib/pgsql/9.6
> You can't hardlink between different file systems.

We'd never hardlink.  Eliminates the ability to return to the old system if 
something goes wrong.

-- 
Born in Arizona, moved to Babylonia.