Originally you mentioned 14TB HDDs not 15TB. Could this be a trick? If not - please share "ceph osd df tree" output? On 4/4/2023 2:18 PM, Work Ceph wrote:
Thank you guys for your replies. The "used space" there is exactly that. It is the accounting for Rocks.DB and WAL. ``` RAW USED: The sum of USED space and the space allocated the db and wal BlueStore partitions. ```
There is one detail I do not understand. We are off-loading WAL and RocksDB to an NVME device; however, Ceph still seems to think that we use our data plane disks to store those elements. We have about 375TB (5 * 5 * 15) in HDD disks, and Ceph seems to be discounting from the usable space the volume (space) dedicated to WAL and Rocks.DB, which are applied into different disks; therefore, it shows as usable space 364 TB (after removing the space dedicated to WAL and Rocks.DB, which are in another device). Is that a bug of some sort?
On Tue, Apr 4, 2023 at 6:31 AM Igor Fedotov <igor.fedotov@croit.io> wrote:
Please also note that total cluster size reported below as SIZE apparently includes DB volumes:
# ceph df --- RAW STORAGE --- CLASS SIZE AVAIL USED RAW USED %RAW USED hdd 373 TiB 364 TiB 9.3 TiB 9.3 TiB 2.50
On 4/4/2023 12:22 PM, Igor Fedotov wrote: > Do you have standalone DB volumes for your OSD? > > If so then highly likely RAW usage is that high due to DB volumes > space is considered as in-use one already. > > Could you please share "ceph osd df tree" output to prove that? > > > Thanks, > > Igor > > On 4/4/2023 4:25 AM, Work Ceph wrote: >> Hello guys! >> >> >> We noticed an unexpected situation. In a recently deployed Ceph >> cluster we >> are seeing a raw usage, that is a bit odd. We have the following setup: >> >> >> We have a new cluster with 5 nodes with the following setup: >> >> - 128 GB of RAM >> - 2 cpus Intel(R) Intel Xeon Silver 4210R >> - 1 NVME of 2 TB for the rocks DB caching >> - 5 HDDs of 14TB >> - 1 NIC dual port of 25GiB in BOND mode. >> >> >> Right after deploying the Ceph cluster, we see a raw usage of about >> 9TiB. >> However, no load has been applied onto the cluster. Have you guys >> seen such >> a situation? Or, can you guys help understand it? >> >> >> We are using Ceph Octopus, and we have set the following configurations: >> >> ``` >> >> ceph_conf_overrides: >> >> global: >> >> osd pool default size: 3 >> >> osd pool default min size: 1 >> >> osd pool default pg autoscale mode: "warn" >> >> perf: true >> >> rocksdb perf: true >> >> mon: >> >> mon osd down out interval: 120 >> >> osd: >> >> bluestore min alloc size hdd: 65536 >> >> >> ``` >> >> >> Any tip or help on how to explain this situation is welcome! >> _______________________________________________ >> ceph-users mailing list -- ceph-users@ceph.io >> To unsubscribe send an email to ceph-users-leave@ceph.io > -- Igor Fedotov Ceph Lead Developer
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-- Igor Fedotov Ceph Lead Developer Looking for help with your Ceph cluster? Contact us athttps://croit.io croit GmbH, Freseniusstr. 31h, 81247 Munich CEO: Martin Verges - VAT-ID: DE310638492 Com. register: Amtsgericht Munich HRB 231263 Web:https://croit.io | YouTube:https://goo.gl/PGE1Bx