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It looks like he used 'rbd map' to map his volume. If so, then yes just run fstrim on the device.
If it's an instance with a cinder, or a nova ephemeral disk (on ceph) then you have to use virtio-scsi to run discard in your instance.
From: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> on behalf of Jack <ceph@xxxxxxxxxxxxxx>
Sent: Thursday, February 28, 2019 5:39 PM To: solarflow99 Cc: Ceph Users Subject: Re: rbd space usage Ha, that was your issue
RBD does not know that your space (on the filesystem level) is now free to use You have to trim your filesystem, see fstrim(8) as well as the discard mount option The related scsi command have to be passed down the stack, so you may need to check on other level (for instance, your hypervisor's configuration) Regards, On 02/28/2019 11:31 PM, solarflow99 wrote: > yes, but: > > # rbd showmapped > id pool image snap device > 0 rbd nfs1 - /dev/rbd0 > 1 rbd nfs2 - /dev/rbd1 > > > # df -h > Filesystem Size Used Avail Use% Mounted on > /dev/rbd0 8.0T 4.8T 3.3T 60% /mnt/nfsroot/rbd0 > /dev/rbd1 9.8T 34M 9.8T 1% /mnt/nfsroot/rbd1 > > > only 5T is taken up > > > On Thu, Feb 28, 2019 at 2:26 PM Jack <ceph@xxxxxxxxxxxxxx> wrote: > >> Are not you using 3-replicas pool ? >> >> (15745GB + 955GB + 1595M) * 3 ~= 51157G (there is overhead involved) >> >> Best regards, >> >> On 02/28/2019 11:09 PM, solarflow99 wrote: >>> thanks, I still can't understand whats taking up all the space 27.75 >>> >>> On Thu, Feb 28, 2019 at 7:18 AM Mohamad Gebai <mgebai@xxxxxxx> wrote: >>> >>>> On 2/27/19 4:57 PM, Marc Roos wrote: >>>>> They are 'thin provisioned' meaning if you create a 10GB rbd, it does >>>>> not use 10GB at the start. (afaik) >>>> >>>> You can use 'rbd -p rbd du' to see how much of these devices is >>>> provisioned and see if it's coherent. >>>> >>>> Mohamad >>>> >>>>> >>>>> >>>>> -----Original Message----- >>>>> From: solarflow99 [mailto:solarflow99@xxxxxxxxx] >>>>> Sent: 27 February 2019 22:55 >>>>> To: Ceph Users >>>>> Subject: rbd space usage >>>>> >>>>> using ceph df it looks as if RBD images can use the total free space >>>>> available of the pool it belongs to, 8.54% yet I know they are created >>>>> with a --size parameter and thats what determines the actual space. I >>>>> can't understand the difference i'm seeing, only 5T is being used but >>>>> ceph df shows 51T: >>>>> >>>>> >>>>> /dev/rbd0 8.0T 4.8T 3.3T 60% /mnt/nfsroot/rbd0 >>>>> /dev/rbd1 9.8T 34M 9.8T 1% /mnt/nfsroot/rbd1 >>>>> >>>>> >>>>> >>>>> # ceph df >>>>> GLOBAL: >>>>> SIZE AVAIL RAW USED %RAW USED >>>>> 180T 130T 51157G 27.75 >>>>> POOLS: >>>>> NAME ID USED %USED MAX AVAIL >>>>> OBJECTS >>>>> rbd 0 15745G 8.54 39999G >>>>> 4043495 >>>>> cephfs_data 1 0 0 39999G >>>>> 0 >>>>> cephfs_metadata 2 1962 0 39999G >>>>> 20 >>>>> spider_stage 9 1595M 0 39999G 47835 >>>>> spider 10 955G 0.52 39999G >>>>> 42541237 >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> ceph-users mailing list >>>>> ceph-users@xxxxxxxxxxxxxx >>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>>> >>>> >>> >>> >>> >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@xxxxxxxxxxxxxx >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com |
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