On Thu, 2020-05-21 at 06:15 +0800, Ed Greshko wrote: > On 2020-05-21 05:16, Patrick O'Callaghan wrote: > > Just an update on this. After faffing around trying to recover the > > failing disk, I decided to replace it and start afresh. > > > > I formatted 2 1TB drives with ext4 and created a new md volume as > > RAID1. However they are taking many hours to sync, despite being empty. > > Is this normal? > > Just "lurking" here since it has been a very long time since I've configured RAID. > > But I have a question. You said you're starting from scratch? Meaning adding a RAID > array as separate entity to an existing system? If that is the case, I thought the steps > would have been. > > mdadm --create . . . . > > and then > > mkfs.ext4 -F /dev/md0 Yes, I finally realised that. > That aside, is > > Resync Status : 46% complete > > increasing, albeit slowly? Indeed. It has now finished after I left it running overnight. This is over a USB3 connection so not that surprising. This actually happens because of separation of architectural layers, which is normally a good thing but in this case leads to a huge inefficiency (even though it's just when initializing). Basically the RAID subsystem is ensuring that the uninitialised data on these two disks is synchronised, which is a complete waste of time. In systems such as ZFS where the layers are less strictly separated, this presumably wouldn't happen (though I have no experience of it). poc _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
