Hello,
I am using AIC-7XXX v5.0.19 (Adaptec 2842VL) with both Linux 2.0.34 and
2.1.105.
Drive information is below. To put it short:
sda - Micropolis 4345WS WIDE ULTRA QUEUEING
sdb - IBM DCAS 32160 ULTRA QUEUEING LINKING
Activating tagged command queueing for the Micropolis drive -
aic7xxx=tag_info:{{4}} - gives LOADS of timeout (I cannot currently paste
in, sorry), and a lot of set/reset loops, the system is not usable. On the
other hand, activating tagged command queueing for the IBM -
aic7xxx=tag_info:{{,0}} works just fine, even under heavy bus load.
My question: is the Micropolis tagged queueing failure in any way related to
* firmware bugs in the Micropolis drive?
It's a Micropolis. Firmware bugs in the tagged queuing implementation was one
of their specialities. They were also especially competent at firmware bugs
where the drive became wedged so badly that only a power cycle would recover.
* it being a wide drive on a narrow adaptor (I remember 5.0.18 negotiating
wide transfers in spite of that)?
Unlikely.
* it not supporting linked commands?
No. Nothing must really uses linked commands any more.
Leonard
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