Re: Raw use 10 times higher than data use

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Hi Georg,

I am having a similar issue with the RGW pool. However, not to the extent of 10x error rate. In my case, the error rate is a bout 2-3x. My real data usage is around 6TB, but Ceph uses over 17TB. I have asked this question here, but no one seems to know the solution and how to go about finding the wasted space and clearing it.

@ceph_guys - does anyone in the company work in the area of finding the bugs that relate to the wasted space? Anyone could assist us in debugging the fixing our issues?

Thanks

Andrei

----- Original Message -----
> From: "Georg F" <georg@xxxxxxxx>
> To: ceph-users@xxxxxxx
> Sent: Thursday, 26 September, 2019 10:50:01
> Subject:  Raw use 10 times higher than data use

> Hi all,
> 
> I've recently moved a 1TiB pool (3TiB raw use) from hdd osds (7) to newly added
> nvme osds (14). The hdd osds should be almost empty by now as just small pools
> reside on them. The pools on the hdd osds in sum store about 25GiB, which
> should use about 75GiB with a pool size of 3. Wal and db are on separate
> devices.
> 
> However the outputs of ceph df and ceph osd df tell a different story:
> 
> # ceph df
> RAW STORAGE:
>    CLASS     SIZE       AVAIL      USED        RAW USED     %RAW USED
>    hdd       19 TiB     18 TiB     775 GiB      782 GiB          3.98
> 
> # ceph osd df | egrep "(ID|hdd)"
> ID CLASS WEIGHT  REWEIGHT SIZE    RAW USE DATA    OMAP    META     AVAIL   %USE
> VAR  PGS STATUS
> 8   hdd 2.72392  1.00000 2.8 TiB 111 GiB  10 GiB 111 KiB 1024 MiB 2.7 TiB 3.85
> 0.60  65     up
> 6   hdd 2.17914  1.00000 2.3 TiB 112 GiB  11 GiB  83 KiB 1024 MiB 2.2 TiB 4.82
> 0.75  58     up
> 3   hdd 2.72392  1.00000 2.8 TiB 114 GiB  13 GiB  71 KiB 1024 MiB 2.7 TiB 3.94
> 0.62  76     up
> 5   hdd 2.72392  1.00000 2.8 TiB 109 GiB 7.6 GiB  83 KiB 1024 MiB 2.7 TiB 3.76
> 0.59  63     up
> 4   hdd 2.72392  1.00000 2.8 TiB 112 GiB  11 GiB  55 KiB 1024 MiB 2.7 TiB 3.87
> 0.60  59     up
> 7   hdd 2.72392  1.00000 2.8 TiB 114 GiB  13 GiB   8 KiB 1024 MiB 2.7 TiB 3.93
> 0.61  66     up
> 2   hdd 2.72392  1.00000 2.8 TiB 111 GiB 9.9 GiB  78 KiB 1024 MiB 2.7 TiB 3.84
> 0.60  69     up
> 
> The sum of "DATA" is 75,5GiB which is what I am expecting to be used by the
> pools. How come the sum of "RAW USE" is 783GiB? More than 10x the size of the
> stored data. On my nvme osds the "RAW USE" to "DATA" overhead is <1%:
> 
> ceph osd df|egrep "(ID|nvme)"
> ID CLASS WEIGHT  REWEIGHT SIZE    RAW USE DATA    OMAP    META     AVAIL   %USE
> VAR  PGS STATUS
> 0  nvme 2.61989  1.00000 2.6 TiB 181 GiB 180 GiB  31 KiB  1.0 GiB 2.4 TiB 6.74
> 1.05  12     up
> 1  nvme 2.61989  1.00000 2.6 TiB 151 GiB 150 GiB  39 KiB 1024 MiB 2.5 TiB 5.62
> 0.88  10     up
> 13  nvme 2.61989  1.00000 2.6 TiB 239 GiB 238 GiB  55 KiB  1.0 GiB 2.4 TiB 8.89
> 1.39  16     up
> -- truncated --
> 
> I am running ceph version 14.2.3 (0f776cf838a1ae3130b2b73dc26be9c95c6ccc39)
> nautilus (stable) which was upgraded recently from 13.2.1.
> 
> Any help is appreciated.
> 
> Best regards,
> Georg
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