IIRC, BTRFS can use /sys/block/DEV/queue/rotational to enable
SSD-optimized allocator at mount time and mkfs.btrfs uses it to select
metadata allocation scheme.
08.11.2018 9:07, Alexandre DERUMIER пишет:
That's not the case—it's not enabled by default on any controller (my
previous e-mail shows this for a guest with VirtIO SCSI), and virtio-blk
doesn't even support the feature.
ok, didn't known, thanks.
So you have if it can improve ios in guest ? Maybe some ioscheduler use this
value ?
----- Mail original -----
De: "Nick Chevsky" <[email protected]>
À: "pve-devel" <[email protected]>
Cc: "Thomas Lamprecht" <[email protected]>
Envoyé: Mercredi 7 Novembre 2018 18:59:57
Objet: Re: [pve-devel] [PATCH pve-manager] Add "SSD" property to IDE, SATA, and
SCSI hard drives
On Wed, Nov 7, 2018 at 12:36 PM Alexandre DERUMIER <[email protected]>
wrote:
if rotational is already always enabled by default on virtio-scsi &&
virtio-blk,
why not enabled it by default for ide,sata,.... on next qemu version ?
(without any additional option).
That's not the case—it's not enabled by default on any controller (my
previous e-mail shows this for a guest with VirtIO SCSI), and virtio-blk
doesn't even support the feature.
While emulating drives as solid-state could very well be a good *default*
in the future, it should probably remain a setting because we don't want to
change (and potentially break) people's existing guests.
Nick
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