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[Bug 1652459] Re: kvm rbd driver (and maybe others, i.e. qcow2, qed and
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From: |
Коренберг Марк |
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Subject: |
[Bug 1652459] Re: kvm rbd driver (and maybe others, i.e. qcow2, qed and so on) does not report DISCARD-ZERO flag |
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Date: |
Sun, 08 Nov 2020 20:13:13 -0000 |
** Changed in: qemu
Status: Incomplete => New
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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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