Marco, thank you for your bug report.
I am able to reproduce the issue and it does appear the ISA plugin is
not included in the Ceph packages from Hirsute and onward:
# dpkg-query -W ceph-base
ceph-base 15.2.13-0ubuntu0.20.04.1
# dpkg -S libec
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec_generic.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_lrc.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure_generic.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure_sse3.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_isa.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec_sse3.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec_sse4.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure_sse4.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_clay.so
# dpkg-query -W ceph-base
ceph-base 16.2.4-0ubuntu0.21.04.1
# dpkg -S libec
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec_generic.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_lrc.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure_generic.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure_sse3.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec_sse3.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec_sse4.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure_sse4.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_clay.so
# dpkg-query -W ceph-base
ceph-base 16.2.5-0ubuntu2
# dpkg -S libec
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec_generic.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_lrc.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure_generic.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure_sse3.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec_sse3.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_shec_sse4.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_jerasure_sse4.so
ceph-base: /usr/lib/x86_64-linux-gnu/ceph/erasure-code/libec_clay.so
** Also affects: ceph (Ubuntu)
Importance: Undecided
Status: New
** Changed in: ceph (Ubuntu)
Status: New => Triaged
** Changed in: ceph (Ubuntu)
Importance: Undecided => High
** Changed in: charm-ceph-mon
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1940697
Title:
missing erasure code plugin library libec_isa.so
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