Re: Migration Nautilus to Pacifi : Very high latencies (EC profile)

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Hello,

what exact EC level do you use?

I can confirm, that our internal data shows a performance drop when using
pacific. So far Octopus is faster and better than pacific but I doubt you
can roll back to it. We haven't rerun our benchmarks on Quincy yet, but
according to some presentation it should be faster than pacific. Maybe try
to jump away from the pacific release into the unknown!

--
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On Sat, 14 May 2022 at 12:27, stéphane chalansonnet <schalans@xxxxxxxxx>
wrote:

> Hello,
>
> After a successful update from Nautilus to Pacific on Centos8.5, we
> observed some high latencies on our cluster.
>
> We did not find very much thing on community related to latencies post
> migration
>
> Our setup is
> 6x storage Node (256GRAM, 2SSD OSD + 5*6To SATA HDD)
> Erasure coding profile
> We have two EC pool :
> -> Pool1 : Full HDD SAS Drive 6To
> -> Pool2 : Full SSD Drive
>
> Object S3 and RBD block workload
>
> Our performances in nautilus, before the upgrade , are acceptable.
> However , the next day , performance dropped by 3 or 4
> Benchmark showed 15KIOPS on flash drive , before upgrade we had
> almost 80KIOPS
> Also, HDD pool is almost down (too much lantencies
>
> We suspected , maybe, an impact on erasure Coding configuration on Pacific
> Anyone observed the same behaviour ? any tuning ?
>
> Thank you for your help.
>
> ceph osd tree
> ID   CLASS  WEIGHT     TYPE NAME                 STATUS  REWEIGHT  PRI-AFF
>  -1         347.61304  root default
>  -3          56.71570      host cnp31tcephosd01
>   0    hdd    5.63399          osd.0                 up   1.00000  1.00000
>   1    hdd    5.63399          osd.1                 up   1.00000  1.00000
>   2    hdd    5.63399          osd.2                 up   1.00000  1.00000
>   3    hdd    5.63399          osd.3                 up   1.00000  1.00000
>   4    hdd    5.63399          osd.4                 up   1.00000  1.00000
>   5    hdd    5.63399          osd.5                 up   1.00000  1.00000
>   6    hdd    5.63399          osd.6                 up   1.00000  1.00000
>   7    hdd    5.63399          osd.7                 up   1.00000  1.00000
>  40    ssd    5.82190          osd.40                up   1.00000  1.00000
>  48    ssd    5.82190          osd.48                up   1.00000  1.00000
>  -5          56.71570      host cnp31tcephosd02
>   8    hdd    5.63399          osd.8                 up   1.00000  1.00000
>   9    hdd    5.63399          osd.9               down   1.00000  1.00000
>  10    hdd    5.63399          osd.10                up   1.00000  1.00000
>  11    hdd    5.63399          osd.11                up   1.00000  1.00000
>  12    hdd    5.63399          osd.12                up   1.00000  1.00000
>  13    hdd    5.63399          osd.13                up   1.00000  1.00000
>  14    hdd    5.63399          osd.14                up   1.00000  1.00000
>  15    hdd    5.63399          osd.15                up   1.00000  1.00000
>  49    ssd    5.82190          osd.49                up   1.00000  1.00000
>  50    ssd    5.82190          osd.50                up   1.00000  1.00000
>  -7          56.71570      host cnp31tcephosd03
>  16    hdd    5.63399          osd.16                up   1.00000  1.00000
>  17    hdd    5.63399          osd.17                up   1.00000  1.00000
>  18    hdd    5.63399          osd.18                up   1.00000  1.00000
>  19    hdd    5.63399          osd.19                up   1.00000  1.00000
>  20    hdd    5.63399          osd.20                up   1.00000  1.00000
>  21    hdd    5.63399          osd.21                up   1.00000  1.00000
>  22    hdd    5.63399          osd.22                up   1.00000  1.00000
>  23    hdd    5.63399          osd.23                up   1.00000  1.00000
>  51    ssd    5.82190          osd.51                up   1.00000  1.00000
>  52    ssd    5.82190          osd.52                up   1.00000  1.00000
>  -9          56.71570      host cnp31tcephosd04
>  24    hdd    5.63399          osd.24                up   1.00000  1.00000
>  25    hdd    5.63399          osd.25                up   1.00000  1.00000
>  26    hdd    5.63399          osd.26                up   1.00000  1.00000
>  27    hdd    5.63399          osd.27                up   1.00000  1.00000
>  28    hdd    5.63399          osd.28                up   1.00000  1.00000
>  29    hdd    5.63399          osd.29                up   1.00000  1.00000
>  30    hdd    5.63399          osd.30                up   1.00000  1.00000
>  31    hdd    5.63399          osd.31                up   1.00000  1.00000
>  53    ssd    5.82190          osd.53                up   1.00000  1.00000
>  54    ssd    5.82190          osd.54                up   1.00000  1.00000
> -11          56.71570      host cnp31tcephosd05
>  32    hdd    5.63399          osd.32                up   1.00000  1.00000
>  33    hdd    5.63399          osd.33                up   1.00000  1.00000
>  34    hdd    5.63399          osd.34                up   1.00000  1.00000
>  35    hdd    5.63399          osd.35                up   1.00000  1.00000
>  36    hdd    5.63399          osd.36                up   1.00000  1.00000
>  37    hdd    5.63399          osd.37                up   1.00000  1.00000
>  38    hdd    5.63399          osd.38                up   1.00000  1.00000
>  39    hdd    5.63399          osd.39                up   1.00000  1.00000
>  55    ssd    5.82190          osd.55                up   1.00000  1.00000
>  56    ssd    5.82190          osd.56                up   1.00000  1.00000
> -13          64.03453      host cnp31tcephosd06
>  41    hdd    7.48439          osd.41                up   1.00000  1.00000
>  42    hdd    7.48439          osd.42                up   1.00000  1.00000
>  43    hdd    7.48439          osd.43                up   1.00000  1.00000
>  44    hdd    7.48439          osd.44                up   1.00000  1.00000
>  45    hdd    7.48439          osd.45                up   1.00000  1.00000
>  46    hdd    7.48439          osd.46                up   1.00000  1.00000
>  47    hdd    7.48439          osd.47                up   1.00000  1.00000
>  57    ssd    5.82190          osd.57                up   1.00000  1.00000
>  58    ssd    5.82190          osd.58                up   1.00000  1.00000
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