shredding LVM volumes may affect performance of other VMs on compute host
Bug #1835201 reported by
Pavlo Shchelokovskyy
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| OpenStack Compute (nova) |
Confirmed
|
Wishlist
|
Unassigned | ||
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).
Revision history for this message
| Matt Riedemann (mriedem) wrote | #1 |
| tags: | added: libvirt lvm |
| Changed in nova: | |
| status: | New → Confirmed |
| importance: | Undecided → Wishlist |
Revision history for this message
| Matt Riedemann (mriedem) wrote | #2 |
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Cinder has a config option for specifying ionice:
https:/
I could see the same thing being added to nova.