On Thu, 6 May 1999, Kenneth D. Merry wrote:
> The LXY4 firmware (and earlier firmware versions) on Quantum Atlas II's is
> known to be buggy. If you have enough I/O going on the drive and on
> the SCSI bus, the drive will go "out to lunch" and will require either a
> BDR or a bus reset to wake it up.
>
> The LYK8 firmware is buggy as well, at least with respect to tagged
> queueing, but at least the drive won't hang with that firmware.
The funny thing is, when I asked about firmware upgrades, an engineer at
Quantum told me there were no known TQ related bugs in LXY4, but suggested
I could try LYK8.
> The reason your system was more stable with tagged queueing disabled is
> probably because you drastically reduced the I/O load on your drive, but
> you probably also reduced the random I/O capability of your striped drives.
Yeah. It definitely was slower with TQ disabled, but at least it worked.
I'm running now with write caching on the drives disabled and a queue
depth of 8 per drive. So far, it seems stable and performs reasonably.
What bugs have you found in LYK8? I'd like to figure out if it's worth
trying to upgrade or if I'm better off just leaving things as is now that
they appear to work.
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