April fools day!!!!!! :) -----Original Message----- Sent: 01 April 2020 17:28 To: ceph-users@xxxxxxx Subject: [Octopus] Beware the on-disk conversion Hi, As the upgrade documentation tells: > Note that the first time each OSD starts, it will do a format > conversion to improve the accounting for omap data. This may take a > few minutes to as much as a few hours (for an HDD with lots of omap > data). You can disable this automatic conversion with: What the documentation does not say is that this process takes a lot of memory I am upgrading a rusty cluster from Nautilus, you can check out the ram consumption as attachment First, we have a 3TB osd conversion: it tooks ~15min, and 19GB of memory Then, we have a larger 6TB osd conversion: it tooks more than 2 hours, and 35GB of memory Finally, you have the largest 10TB osd: only 1H15, but 52GB of memory _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
 |