yahoo-eng-team team mailing list archive

[Pavlo Shchelokovskyy <1835201@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When configured with LVM local storage for ephemeral partitions, Nova performs wiping operation using `shred` before removing volume once a VM is deleted.
`shred` consumes a lot of CPU and almost all disk bandwidth (even on SSDs) which drastically affects the performance of other VMs running on the same Compute.
The bigger volume size is specified in a flavor the longer this operation takes and VMs suffer.

Would be nice to be able to specify the ionice level for this operation
(like `ionice -c3` to use the Idle I/O Scheduler).

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1835201

Title:
  shredding LVM volumes may affect performance of other VMs on compute
  host

Status in OpenStack Compute (nova):
  New

Bug description:
  When configured with LVM local storage for ephemeral partitions, Nova performs wiping operation using `shred` before removing volume once a VM is deleted.
  `shred` consumes a lot of CPU and almost all disk bandwidth (even on SSDs) which drastically affects the performance of other VMs running on the same Compute.
  The bigger volume size is specified in a flavor the longer this operation takes and VMs suffer.

  Would be nice to be able to specify the ionice level for this
  operation (like `ionice -c3` to use the Idle I/O Scheduler).

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