01-04-2010
lto4 devices on mpt fusion driver
We are seeing an odd problem on an HP dl380 running Redhat es5 (2.6.18-52+.el5). we have 3 dual channel HBA's with a single tape drive on each channel totaling six tape drives.(2 x lto3, and 4 xlto4). The problem is only a two of the lto-4s are working. At first we thought it might be hardware, but we have swapped everything out with new parts and we still see the same issue.
We have used the sg3_utils package to look at the devices. If you use the sg devices for each, they all can take commands and respond to the sg_senddiag command. Once you start trying to use the /dev/st or /dev/nst the devices the work respond ok, the others give an IO error(EIO). In fact, if you run a sginfo -l you can see that it thinks only some of the devices are tape devices and the two drives that aren't working are just generic scsi devices. sginfo can see they are ultrium drives, but have no /dev/st or /dev/nst associated devices.
Since they are really all the same tape drives, we can't figure out why they aren't all working or all not working. To make matters worse, if you use the Fusion Redhat drivers, each time you boot, the drives that aren't working will be different drives. Upgrading to the latest LSI mpt drivers seemed to have fixed this however. We also along the way completely reinstalled the OS from media and updated it.
The server had been working in the configuration for almost a year. It had a network problem that we rebooted it for, and since then the drives have been in this state. Just really not sure where to look from here.
I am assuming that there might be something wrong in the st.ko module. the fact the /dev/st devices don't work but the sg devices do seems to point to some kind of weird thing going on one layer up. I have been all over the linux scsi forums and have tickets open with RH but have not resolution as yet, so I thought I would post here.
Hope someone else has seen something like this.
thanks,
Bil
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tcopy(1) User Commands tcopy(1)
NAME
tcopy - copy a magnetic tape
SYNOPSIS
tcopy source [destination]
DESCRIPTION
The tcopy utility copies the magnetic tape mounted on the tape drive specified by the source argument. The only assumption made about the
contents of a tape is that there are two tape marks at the end.
When only a source drive is specified, tcopy scans the tape, and displays information about the sizes of records and tape files. If a des-
tination is specified, tcopy makes a copies the source tape onto the destination tape, with blocking preserved. As it copies, tcopy pro-
duces the same output as it does when only scanning a tape.
The tcopy utility requires the use of Berkeley-compatible device names. For example,
example% tcopy /dev/rmt/1b /dev/rmt/2b
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWesu |
+-----------------------------+-----------------------------+
SEE ALSO
mt(1), ioctl(2), attributes(5)
NOTES
tcopy will only run on systems supporting an associated set of ioctl(2) requests.
SunOS 5.10 10 Mar 2000 tcopy(1)