Richard Elling wrote:
JS wrote:
I'm using ZFS on both EMC and Pillar arrays with PowerPath and MPxIO,
respectively. Both work fine - the only caveat is to drop your
sd_queue to around 20 or so, otherwise you can run into an ugly
display of bus resets.
This is sd_max_throttle or ssd_max_throttle. The problem is that the
host can
easily overrun the storage for slow storage devices. This will reduce
the load
on the storage device. Consult the storage configuration guidelines
for recommended
values (default = 256 outstanding commands, in the old days EMC
recommended 20).
Yes, we'd all like this problem to go away.
An other note: This drops the queue size for all devices that use the sd
or ssd driver.
I'm still not sure why EMC/HDS/Pillar boxes can't send a queue full
response back when they start to fill up like other storage arrays do.
It gets even worse when you have to do the "HDS Math" to set all your
hosts to some low queue size.
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