On Tue, Apr 13, 2021 at 9:00 AM Wido den Hollander <wido@xxxxxxxx> wrote: > > > > On 4/12/21 5:46 PM, Dan van der Ster wrote: > > Hi all, > > > > bdev_enable_discard has been in ceph for several major releases now > > but it is still off by default. > > Did anyone try it recently -- is it safe to use? And do you have perf > > numbers before and after enabling? > > > > I have done so on SATA SSDs in a few cases and: it worked > > Did I notice a real difference? Not really. > Thanks, I've enabled it on a test box and am draining data to check that it doesn't crash anything. > It's highly debated if this still makes a difference with modern flash > devices. I don't think there is a real conclusion if you still need to > trim/discard blocks. Do you happen to have any more info on these debates? As you know we have seen major performance issues on hypervisors that are not running a periodic fstrim; we use similar or identical SATA ssds for HV local storage and our block.db's. If it doesn't hurt anything, why wouldn't we enable it by default? Cheers, Dan _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
 |