TRIM, iSCSI and %busy waves
Eugene M. Zheganin
eugene at zhegan.in
Thu Apr 5 15:18:15 UTC 2018
On 05.04.2018 20:00, Warner Losh wrote:
> I'm also having a couple of iSCSI issues that I'm dealing through
> bounty with, so may be this is related somehow. Or may be not. Due
> to some issues in iSCSI stack my system sometimes reboots, and
> then these "waves" are stopped for some time.
> So, my question is - can I fine-tune TRIM operations ? So they
> don't consume the whole disk at 100%. I see several sysctl oids,
> but they aren't well-documented.
> You might be able to set the delete method.
Set it to what ? It's not like I'm seeing FreeBSD for the first time,
but from what I see in sysctl - all of those "sysctl -a | grep trim"
oids are numeric.
> P.S. This is 11.x, disks are Toshibas, and they are attached via
> LSI HBA.
> Which LSI HBA?
A SAS9300-4i4e one.
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