kvm rbd driver (and maybe others, i.e. qcow2, qed and so on) does not report DISCARD-ZERO flag
Bug #1652459 reported by
Коренберг Марк
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| QEMU |
Expired
|
Undecided
|
Unassigned | ||
Bug Description
# lsblk -D
NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO
sda 0 4K 1G 0
├─sda1 0 4K 1G 0
├─sda2 1024 4K 1G 0
└─sda5 0 4K 1G 0
Last column should be `1` at least for "RBD+discard=unmap" since reading from discarded regions in RBD MUST return zeroes. The same with QCOW2, QED and sparse raw images. KVM should copy value of this flag when real raw device (i.e. real SSD) with discard capability is used as virtual disk.
| description: | updated |
| description: | updated |
| description: | updated |
| description: | updated |
| description: | updated |
Revision history for this message
| Thomas Huth (th-huth) wrote | #1 |
| Changed in qemu: | |
| status: | New → Incomplete |
| Changed in qemu: | |
| status: | Incomplete → New |
Revision history for this message
| Thomas Huth (th-huth) wrote Moved bug report | #2 |
| Changed in qemu: | |
| status: | New → Expired |
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