Don't mean to hijack the thread, but I may be observing something
similar with 16.2.12: OSD performance noticeably peaks after OSD
restart and then gradually reduces over 10-14 days, while commit
and apply latencies increase across the board.
Non-default settings are:
"bluestore_cache_size_hdd": {
"default": "1073741824",
"mon": "4294967296",
"final": "4294967296"
},
"bluestore_cache_size_ssd": {
"default": "3221225472",
"mon": "4294967296",
"final": "4294967296"
},
...
"osd_memory_cache_min": {
"default": "134217728",
"mon": "2147483648",
"final": "2147483648"
},
"osd_memory_target": {
"default": "4294967296",
"mon": "17179869184",
"final": "17179869184"
},
"osd_scrub_sleep": {
"default": 0,
"mon": 0.10000000000000001,
"final": 0.10000000000000001
},
"rbd_balance_parent_reads": {
"default": false,
"mon": true,
"final": true
},
All other settings are default, the usage is rather simple
Openstack / RBD.
I also noticed that OSD cache usage doesn't increase over time
(see my message "Ceph 16.2.12, bluestore cache doesn't seem to be
used much" dated 26 April 2023, which received no comments),
despite OSDs are being used rather heavily and there's plenty of
host and OSD cache / target memory available. It may be worth
checking if available memory is being used in a good way.
/Z
On Mon, 8 May 2023 at 22:35, Igor Fedotov <igor.fedotov@xxxxxxxx>
wrote:
Hey Nikola,
On 5/8/2023 10:13 PM, Nikola Ciprich wrote:
> OK, starting collecting those for all OSDs..
> I have hour samples of all OSDs perf dumps loaded in DB, so
I can easily examine,
> sort, whatever..
>
You didn't reset the counters every hour, do you? So having
average
subop_w_latency growing that way means the current values
were much
higher than before.
Curious if subop latencies were growing for every OSD or just
a subset
(may be even just a single one) of them?
Next time you reach the bad state please do the following if
possible:
- reset perf counters for every OSD
- leave the cluster running for 10 mins and collect perf
counters again.
- Then start restarting OSD one-by-one starting with the
worst OSD (in
terms of subop_w_lat from the prev step). Wouldn't be
sufficient to
reset just a few OSDs before the cluster is back to normal?
>> currently values for avgtime are around 0.0003 for
subop_w_lat and 0.001-0.002
>> for op_w_lat
> OK, so there is no visible trend on op_w_lat, still between
0.001 and 0.002
>
> subop_w_lat seems to have increased since yesterday though!
I see values from
> 0.0004 to as high as 0.001
>
> If some other perf data might be interesting, please let me
know..
>
> During OSD restarts, I noticed strange thing - restarts on
first 6 machines
> went smooth, but then on another 3, I saw rocksdb logs
recovery on all SSD
> OSDs. but first didn't see any mention of daemon crash in
ceph -s
>
> later, crash info appeared, but only about 3 daemons (in
total, at least 20
> of them crashed though)
>
> crash report was similar for all three OSDs:
>
> [root@nrbphav4a ~]# ceph crash info
2023-05-08T17:45:47.056675Z_a5759fe9-60c6-423a-88fc-57663f692bd3
> {
> "backtrace": [
> "/lib64/libc.so.6(+0x54d90) [0x7f64a6323d90]",
> "(BlueStore::_txc_create(BlueStore::Collection*,
BlueStore::OpSequencer*, std::__cxx11::list<Context*,
std::allocator<Context*> >*,
boost::intrusive_ptr<TrackedOp>)+0x413) [0x55a1c9d07c43]",
>
"(BlueStore::queue_transactions(boost::intrusive_ptr<ObjectStore::CollectionImpl>&,
std::vector<ceph::os::Transaction,
std::allocator<ceph::os::Transaction> >&,
boost::intrusive_ptr<TrackedOp>,
ThreadPool::TPHandle*)+0x22b) [0x55a1c9d27e9b]",
> "(ReplicatedBackend::submit_transaction(hobject_t const&,
object_stat_sum_t const&, eversion_t const&,
std::unique_ptr<PGTransaction,
std::default_delete<PGTransaction> >&&, eversion_t const&,
eversion_t const&, std::vector<pg_log_entry_t,
std::allocator<pg_log_entry_t> >&&,
std::optional<pg_hit_set_history_t>&, Context*, unsigned
long, osd_reqid_t, boost::intrusive_ptr<OpRequest>)+0x8ad)
[0x55a1c9bbcfdd]",
> "(PrimaryLogPG::issue_repop(PrimaryLogPG::RepGather*,
PrimaryLogPG::OpContext*)+0x38f) [0x55a1c99d1cbf]",
>
"(PrimaryLogPG::simple_opc_submit(std::unique_ptr<PrimaryLogPG::OpContext,
std::default_delete<PrimaryLogPG::OpContext> >)+0x57)
[0x55a1c99d6777]",
>
"(PrimaryLogPG::handle_watch_timeout(std::shared_ptr<Watch>)+0xb73)
[0x55a1c99da883]",
> "/usr/bin/ceph-osd(+0x58794e) [0x55a1c992994e]",
> "(CommonSafeTimer<std::mutex>::timer_thread()+0x11a)
[0x55a1c9e226aa]",
> "/usr/bin/ceph-osd(+0xa80eb1) [0x55a1c9e22eb1]",
> "/lib64/libc.so.6(+0x9f802) [0x7f64a636e802]",
> "/lib64/libc.so.6(+0x3f450) [0x7f64a630e450]"
> ],
> "ceph_version": "17.2.6",
> "crash_id":
"2023-05-08T17:45:47.056675Z_a5759fe9-60c6-423a-88fc-57663f692bd3",
> "entity_name": "osd.98",
> "os_id": "almalinux",
> "os_name": "AlmaLinux",
> "os_version": "9.0 (Emerald Puma)",
> "os_version_id": "9.0",
> "process_name": "ceph-osd",
> "stack_sig":
"b1a1c5bd45e23382497312202e16cfd7a62df018c6ebf9ded0f3b3ca3c1dfa66",
> "timestamp": "2023-05-08T17:45:47.056675Z",
> "utsname_hostname": "nrbphav4h",
> "utsname_machine": "x86_64",
> "utsname_release": "5.15.90lb9.01",
> "utsname_sysname": "Linux",
> "utsname_version": "#1 SMP Fri Jan 27 15:52:13 CET 2023"
> }
>
>
> I was trying to figure out why this particular 3 nodes
could behave differently
> and found out from colleagues, that those 3 nodes were
added to cluster lately
> with direct install of 17.2.5 (others were installed
15.2.16 and later upgraded)
>
> not sure whether this is related to our problem though..
>
> I see very similar crash reported
here:https://tracker.ceph.com/issues/56346
> so I'm not reporting..
>
> Do you think this might somehow be the cause of the
problem? Anything else I should
> check in perf dumps or elsewhere?
Hmm... don't know yet. Could you please last 20K lines prior
the crash
from e.g two sample OSDs?
And the crash isn't permanent, OSDs are able to start after the
second(?) shot, aren't they?
> with best regards
>
> nik
>
>
>
>
>
>
--
Igor Fedotov
Ceph Lead Developer
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