On Wed, 8 Jul 2015 16:18:58 +0200 (CEST), Gabriele Bulfon wrote:
Hi,
I think I've found why an April 2012 kernel shows faster response on
iscsi than a Dec 2014 one.
Looks like the iscsi sync=standard works almost like disabled on the old
one, while almost like enabled on the new one.
Obviously, justs by adding the zil to the new one will let the iscsi
work as expected.
I was just trying to guess why the two systems were acting different on
the same config without zil.
So, my question is:
- is the sync=standard of iscsi vols changed since Apr 2012, so now it
syncs much more than before?
- can I be safe on installed machines with old kernel, where iscsi-vols
have sync=default, syncing less, but having a zil?
This commit *could* be related, check if the wcd settings of your ZFS
volumes differ between the systems:
https://github.com/illumos/illumos-gate/commit/7e0955bbb1c326d78038afe0d108c8ae4934a78a
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