On Fri, Jul 21, 2017 at 06:21:15PM +0000, Eric Robinson wrote:
Folks, does anyone know why trim does not show as enabled for drbd?
The physical drives support it. The raid array supports it. I can trim non-drbd
volumes just fine. But the drbd devices show trim as not supported.
# lsblk -D
NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO
sda 0 512B 4G 1
├─sda1 0 512B 4G 1
│ └─md0 0 128K 256M 0
├─sda2 0 512B 4G 1
│ └─md1 0 128K 256M 0
├─sda3 0 512B 4G 1
├─sda4 0 512B 4G 1
├─sda5 0 512B 4G 1
│ └─md2 0 128K 256M 0
│ └─drbd0 0 0B 0B 0 <-- Note: DISC-GRAN
and DISC-MAX should be non-zero.
I'm using drbd 9.0.1.
For DRBD 9, we will pretty much ignore any complaints against anything
older than "latest", which currently is 9.0.8.
The up-merge of the write-same and discard support from 8 to 9
was unfortunately broken in many ways.
It has just received yet an other fix (unrelated to your scenario,
related to the request size verification) even post 9.0.8.
So yes, it *will* help.
And no, you will not have any luck with 9.0.1. Not at all.
And not only for discards.
--
: Lars Ellenberg
: LINBIT | Keeping the Digital World Running
: DRBD -- Heartbeat -- Corosync -- Pacemaker
DRBD® and LINBIT® are registered trademarks of LINBIT
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