Harshavardhana e124d88788 optimize listing operation concurrency (#12728) ...

- remove use of getOnlineDisks() instead rely on fallbackDisks()
  when disk return errors like diskNotFound, unformattedDisk
  use other fallback disks to list from, instead of paying the
  price for checking getOnlineDisks()

- optimize getDiskID() further to avoid large write locks when
  looking formatLastCheck time window

This new change allows for a more relaxed fallback for listing
allowing for more tolerance and also eventually gain more
consistency in results even if using '3' disks by default.

2021-07-24 22:03:38 -07:00

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