I've also got some questions concerning the Mylex 960:
I've got a JBOD box with 5 Seagate Elite23 disks, which is connected to a
Mylex DAC960 PG controller (channel 0). On channel 2 (internal) I've got 5
Barracuda 18Gb disks. The machine is a PIII450 with 384Mb RAM, a
DAC960PG, Supermicro Dual PII mainboard with onboard 789x SCSI. Running
Mandrake 6.0, kernel 2.2.7 with the latest patches available
The Elites used to be mounted on a Sun computer, and caused no trouble
there. The barracudas were mounted in a JBOD cabinet on a Sun, and caused
no trouble. However, when I put the Barracudas in the server, I had to disable
Tagged command queuing to make it work (else it said "bad tag received from"
whatever disk was ID 0.). I also connected the JBOD cabinet with the Elites to
channel 0 on the DAC960. I got that initialized, and formatted it, mounted it,
and finally started using it. After a while I began to get some weird messages:
DAC960#0:Physical Drive 0:10 Error Log: Sense Key=6, ASC=29, ASCQ=00
------------"---------------------------------------------: Information = 00000000
00000000
And that message is repeated for each disk (0:11, 0:12 etc). I don't have any
disks on the lower addresses (because the disks were set this way when I took
over). /proc/rd/status says "OK", /proc/rd/c0/current_status reports no
problems.
It takes me 3-4 minutes to mount it, and these error messages pops up all the
time.
The last part is the System drive setup... I tried to add 5 more Elite23 disks on
Channel 1, but when I plugged the disks in without setting them up, the
DAC960
1: Did not set up any of the previously configured system drives.
2: Did not find the last 23Gb disk (only 4 of 5 disks, and this box just came
from another server that's been running on the disks for almost a year.).
3: When I tried to delete one system drive (the other 23Gb Elites) to make a
new bigger one, it says it can only delete the last created system drive. That's
my 80Gb RAID5 disk with lots of important data! This isn't a big problem, I've
got backup, but taping in and out takes time. And does that limit really
increase security or whatever it's there for?
All in all, is the DAC960 a very "strict" card that won't work with cables that
work with most others? My cable length is about 1.50 meters, with a 0.6 meter
cable and 0.9 meter approx inside the JBOD. My terminators are active, and I
have no 68->50 pin converters on the chain.
Any help appreciated,
Kent R. Nilsen
