[Bug 1983716] Re: Improve performances of glance when using rbd backend

[Chris Halse Rogers]

So, a 30% performance improvement seems like it might make sense for an
SRU, but could you please add the standard SRU information:
https://wiki.ubuntu.com/StableReleaseUpdates#SRU_Bug_Template

Particularly: what is the regression potential here? It seems this will
change the pattern of `resize` calls and presumably significantly
increase the size of the `resize` calls; is this likely to have knock-on
effects? The resize may now overshoot; what will happen if the backing
store can fit the image, but *not* the image+8G? And so on.

** Changed in: python-glance-store (Ubuntu Focal)
       Status: Triaged => Incomplete

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https://bugs.launchpad.net/bugs/1983716

Title:
  Improve performances of glance when using rbd backend

Status in python-glance-store package in Ubuntu:
  Invalid
Status in python-glance-store source package in Focal:
  Incomplete

Bug description:
  Hello,

  In order to significantly improve performances of images upload on rbd
  store, it would be great if commit [1] can be backported from branch
  2.0.1 to focal package (actually 2.0.0-0ubuntu3).

  Except for image upload, the real use case here is to speedup
  instances snapshots, benchmarks between 2.0.0 and 2.0.1 reports a
  performance gain of ~30%: it drops from 230 to 165 seconds with an
  image of 10GB (metrics shows up in nova-compute.log on the host where
  the snapshot occurs).

  
  [1] commit ca0c58b52756058b6d51bf6a47aeac3d525c1e16 (HEAD -> stable/ussuri, tag: ussuri-em, tag: 2.0.1, origin/stable/ussuri)

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