Public bug reported:
# 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.
** Affects: qemu
Importance: Undecided
Status: New
** Description changed:
+ ```
# 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.
+ 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 changed:
- ```
- # 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
- ```
+ # 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.
+
+ 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 changed:
- # 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
+ <code>
+ # 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
+ <code>
-
- 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.
+ 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 changed:
- <code>
+ <pre>
# 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
- <code>
+ </pre>
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 changed:
- <pre>
# 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
- </pre>
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.
--
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https://bugs.launchpad.net/bugs/1652459
Title:
kvm rbd driver (and maybe others, i.e. qcow2, qed and so on) does not
report DISCARD-ZERO flag
Status in QEMU:
New
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.
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https://bugs.launchpad.net/qemu/+bug/1652459/+subscriptions
