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4 Replies Latest reply: Sep 18, 2007 5:12 PM by user4994457 RSS

LTO-3 tape drive and scsi host

807567 Newbie
Currently Being Moderated
Hi, We have a Sun Ultra 45 system with 10.0 OS.
Trying to get an LTO-3 tapedrive with a LSI22320-S host adapter configured.

Doing a boot -- -r and edit the st.conf file by adding "tape-config-list"
I can see the drive doing a "mt -f /dev/rmt/0 status"

But doing dd read/write commands we are not getting anything near the throughput that it saids in the specs ..ie..using an LTO3 drive with an LTO3 media we should be need 80Mbytes a sec. We are getting about 37Mbytes.

Anyone have any luck with an LTO3 drive.? Also does anyone have any tape test they do besides dd commands to test the I/O of a drive?

I can't seem to find a driver for that card, and wonder does someone know a good source for solaris drivers.

surfing as I type here too for help, thanks for your time!
regards
  • 1. Re: LTO-3 tape drive and scsi host
    user4994457 Newbie
    Currently Being Moderated
    corky007 wrote:
    Hi, We have a Sun Ultra 45 system with 10.0 OS.
    Trying to get an LTO-3 tapedrive with a LSI22320-S host adapter configured.

    Doing a boot -- -r and edit the st.conf file by adding "tape-config-list"
    I can see the drive doing a "mt -f /dev/rmt/0 status"
    You shouldn't need to edit tape-config-list. The LTO3 is already configured.
    But doing dd read/write commands we are not getting anything near the throughput that it saids in the specs ..ie..using an LTO3 drive with an LTO3 media we should be need 80Mbytes a sec. We are getting about 37Mbytes.
    What device are you writing to? Is your data compessible and are you compressing? My assumption is that 80MB/s is only with compression. I'm not sure if the '0' device compresses. You probably want to use the '0cbn' device.
    I can't seem to find a driver for that card, and wonder does someone know a good source for solaris drivers.
    If you can see the tape at all, you must have a working driver.

    --
    Darren
  • 2. Re: LTO-3 tape drive and scsi host
    807567 Newbie
    Currently Being Moderated
    Hi,

    thanks for your time, when I first hooked up I would do a boot -- -r at ok prompt or do a drvconfig then tapes to see the drive. Either way it would see the drive but the mt -f /dev/rmt/0 status would say "unconfigured drive" and I forget what else off the top of my head.

    I was thinking that maybe it was seeing it but not configured quite right
    the "unconfigured drive part was throwing me off

    I'm just doing dd comands from writing the disk to tape

    "time if=/dev/dsk/c1t0d0s0 of=/dev/rmt/0 bs=8192 count=1000"

    then do a "dd time if=/dev/rmt/0n of=dev/null bs=65536 count=1000"

    we would do that doubling the blk size till we got to 262144

    Then if I'm correct, divide the blk size by finish time and get the bytes per seconds.

    Not compressing on purpose :) I need to read on that more

    I got an LTO diag from quantum and it will write and read. not much to it to tell me anything.

    regards
  • 3. Re: LTO-3 tape drive and scsi host
    user4994457 Newbie
    Currently Being Moderated
    corky007 wrote:
    Hi,

    thanks for your time, when I first hooked up I would do a boot -- -r at ok prompt or do a drvconfig then tapes to see the drive. Either way it would see the drive but the mt -f /dev/rmt/0 status would say "unconfigured drive" and I forget what else off the top of my head.
    If it can't talk to a device (no drive, bad drivers, otherwise uncommunicative), the Solaris driver will say something like:


    /dev/rmt/0cbn: No such device or address

    If it can talk to the drive, but there's no tape loaded, you'll get:

    /dev/rmt/0cbn: no tape loaded or drive offline

    You have to have a tape in it to get the more verbose portions of the data (like drive type).
    --
    Darren
  • 4. Re: LTO-3 tape drive and scsi host
    user4994457 Newbie
    Currently Being Moderated
    I'm just doing dd comands from writing the disk to tape

    "time if=/dev/dsk/c1t0d0s0 of=/dev/rmt/0 bs=8192 count=1000"
    Try using /dev/rmt/0cn and see if it goes faster/higher capacity.

    --
    Darren