Comment 8 for bug 1808010

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Matt Riedemann (mriedem) wrote : Re: Tempest cirros boots fail due to lack of disk space

(11:25:40 AM) clarkb: frickler: mriedem melwitt to TL;DR the cirros ssh issues, they all root cause down to metadata being slow, but in the case of running out of disk we are attempting to use config drive first (which would ignore the metadata server), but since disk is full that fails then we fall back to metadata then that times out and fails?
(11:26:16 AM) mriedem: metadata api being slow?
(11:26:25 AM) mriedem: as in the guest doesn't get network info fast enough from the meta api?
(11:26:46 AM) clarkb: mriedem: yup, cirros has a 10 second timeout on that network request, and nova was taking 10.something seconds to respond

Which sounds related to bug 1799298 and just general inefficiencies in the metadata-api service serving requests.