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DLT drive makes K420 reboot when accessed

Stephanie L Davenport
Frequent Advisor

DLT drive makes K420 reboot when accessed

I have a refurb 420 that apparently was damaged in some way during a power outage in the datacenter.

After the machine was brought back up, it continually rebooted. We noticed SCSI errors in the rc.log and disconnected the SCSI tape drives. After a lot of investigation (replacing drives, cables and cards), we do not think it is a hardware issue. Could it be a driver issue?

As soon as we try to write the informix (ontape) backup to the DLT, the machine reboots. But, the DDS2 tape drive works fine. We just can't write the database backup to it because of the size.

The only other error we saw was when we ran stm. It said it could possibly be a driver issue (among others).

I have added the output from lsdev, ioscan and sam:

hpbest$/usr/sbin/lsdev -C tape
Character Block Driver Class
205 -1 stape tape
212 -1 tape0 tape

hpbest$/usr/sbin/ioscan -fnkC tape
Class I H/W Path Driver S/W State H/W Type Description
================================================================
tape 11 10/0.2.0 stape CLAIMED DEVICE Quantum DLT4000
/dev/rmt/6m /dev/rmt/8mn
/dev/rmt/6mb /dev/rmt/8mnb
/dev/rmt/6mn /dev/rmt/c0t2d0BEST
/dev/rmt/6mnb /dev/rmt/c0t2d0BESTb
/dev/rmt/8m /dev/rmt/c0t2d0BESTn
/dev/rmt/8mb /dev/rmt/c0t2d0BESTnb
tape 2 10/4/8.0.0 tape2 CLAIMED DEVICE HP C1537A
/dev/diag/rmt/c1t0d0 /dev/rmt/c1t0d0BEST
/dev/rmt/2m /dev/rmt/c1t0d0BESTb
/dev/rmt/2mb /dev/rmt/c1t0d0BESTn
/dev/rmt/2mn /dev/rmt/c1t0d0BESTnb
/dev/rmt/2mnb



10/0.2.0 stape Quantum DLT4000 Tape Drive
10/4/8.0.0 tape2 C1537A 12 GB DDS3 Data Compression Tape Drive (DAT)


Thanks in advance for your help! We have been dealing with this since the middle of May and I'm about to pull my hair out. :)

Steph
8 REPLIES
Torsten.
Acclaimed Contributor

Re: DLT drive makes K420 reboot when accessed

The 10/0 bus is also connected to internal disks - do you have any installed?

What is your OS version?
Can you post a "swlist" and a "ioscan -fn"?

Hope this helps!
Regards
Torsten.

__________________________________________________
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those who understand binary, and those who don't.

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Stephanie L Davenport
Frequent Advisor

Re: DLT drive makes K420 reboot when accessed

It is HP-UX 10.01.

swlist:

hpbest# swlist
# Initializing...
# Contacting target "hpbest"...
#
# Target: hpbest:/
#

#
# Bundle(s):
#

B2491A B.10.01 MirrorDisk/UX
B3701AA B.10.01.22 HP GlancePlus/UX Pak for s800
B3897A_AGS B.10.01 HP-UX Unlimited-User License
B3920AA B.10.01 HP-UX Media Kit (Reference Only. See Description)
B5725AA_APZ A.2.3.205 HP-UX Installation Utilities (Ignite-UX - S800 - 10.20)
HPUXEngGS800 B.10.01 English Run-time HP-UX Environment
Ignite-UX-10-01 A.2.3.205 HP-UX Installation Utilities for Installing 10.01 Systems
Ignite-UX-10-10 A.2.3.205 HP-UX Installation Utilities for Installing 10.10 Systems
Ignite-UX-10-20 A.2.3.205 HP-UX Installation Utilities for Installing 10.20 Systems
J2157A_APS B.10.01.01 FDDI/9000 Series 800
J2467A B.10.01.01 EISA RS-232 MUX Software
J2559C D.06.15 Hewlett-Packard JetAdmin for Unix Utility
MiscDiag B.10.01.04 HPUX 10.0 Support Tools Bundle
OnlineDiag B.10.01.04.06 HPUX 10.0 Support Tools Bundle
XSW800GR1001 B.10.01.37 Extension Software Patch Bundle
#
# Product(s) not contained in a Bundle:
#

PHCO_13465 B.10.00.00.AA Cumulative ups_mond(1M) patch.
PHCO_13678 B.10.00.00.AA cut(1) patch
PHCO_13733 B.10.00.00.AA cumulative passwd(1) patch
PHCO_13984 B.10.00.00.AA fixes dump(1M) handling of active files
PHCO_14039 B.10.00.00.AA Set_parms year 2000 patch
PHCO_14480 B.10.00.00.AA 10.01 10.10 tztab(4) Cummulative Patch
PHCO_14782 B.10.00.00.AA locales Y2K patch
PHCO_14867 B.10.00.00.AA year 2000 fix for power_onoff
PHCO_14889 B.10.00.00.AA SAM cumulative patch.
PHCO_14966 B.10.00.00.AA sar(1M) cumulative Y2K patch
PHCO_15188 B.10.00.00.AA cumulative setup(1M) Year 2000 fix.
PHCO_15205 B.10.00.00.AA Software Distributor cumulative patch
PHCO_15222 B.10.00.00.AA useradd(1M)cumulative patch with Y2K fix
PHCO_15816 B.10.00.00.AA clean_tmps cumulative patch
PHCO_16299 B.10.00.00.AA acctcon1(1M) patch
PHCO_16401 B.10.00.00.AA patch for patch(1)
PHCO_16532 B.10.00.00.AA mkboot(1M) and rmboot(1M) patch
PHCO_16962 B.10.00.00.AA Year 2000 rcs(1) cumulative patch
PHCO_17073 B.10.00.00.AA Year 2000 cumulative SCCS(1) patch
PHCO_17240 B.10.00.00.AA 10.10 10.20 patch for libportnls.a
PHCO_17711 B.10.00.00.AA Year 2000 nroff(1) cumulative patch
PHCO_18131 B.10.00.00.AA Year 2000 HP-UX Operating System Patch Tool
PHCO_19636 B.10.00.00.AA tsm(1) cumulative patch
PHCO_20220 B.10.00.00.AA Year 2000 HP-UX Application Patch Tool
PHCO_20824 B.10.00.00.AA patch cleanup utility
PHCO_21093 B.10.00.00.AA Year 2000 lastlogin patch
PHCO_21145 B.10.00.00.AA envd(1M) cumulative patch.
PHCO_21508 B.10.00.00.AA libc cumulative patch
PHCO_21990 B.10.00.00.AA auto_parms/set_parms
PHCO_22501 B.10.00.00.AA bdf(1M) patch for buffer overflow.
PHCO_22503 B.10.00.00.AA df(1M) cumulative patch
PHCO_22558 B.10.00.00.AA top(1) cumulative patch
PHCO_22763 B.10.00.00.AA cu(1) cumulative patch
PHCO_22770 B.10.00.00.AA cumulative cron/at/crontab patch
PHCO_22849 B.10.00.00.AA ex(1),vi(1),expreserve(1) cumulative patch
PHCO_23091 B.10.00.00.AA man(1) patch
PHCO_23261 B.10.01.15 HP Disk Array Utilities w/AutoRAID Manager
PHCO_23321 B.10.00.00.AA kermit(1) cumulative patch
PHCO_16401 B.10.00.00.AA patch for patch(1)
PHCO_16532 B.10.00.00.AA mkboot(1M) and rmboot(1M) patch
PHCO_16962 B.10.00.00.AA Year 2000 rcs(1) cumulative patch
PHCO_17073 B.10.00.00.AA Year 2000 cumulative SCCS(1) patch
PHCO_17240 B.10.00.00.AA 10.10 10.20 patch for libportnls.a
PHCO_17711 B.10.00.00.AA Year 2000 nroff(1) cumulative patch
PHCO_18131 B.10.00.00.AA Year 2000 HP-UX Operating System Patch Tool
PHCO_19636 B.10.00.00.AA tsm(1) cumulative patch
PHCO_20220 B.10.00.00.AA Year 2000 HP-UX Application Patch Tool
PHCO_20824 B.10.00.00.AA patch cleanup utility
PHCO_21093 B.10.00.00.AA Year 2000 lastlogin patch
PHCO_21145 B.10.00.00.AA envd(1M) cumulative patch.
PHCO_21508 B.10.00.00.AA libc cumulative patch
PHCO_21990 B.10.00.00.AA auto_parms/set_parms
PHCO_22501 B.10.00.00.AA bdf(1M) patch for buffer overflow.
PHCO_22503 B.10.00.00.AA df(1M) cumulative patch
PHCO_22558 B.10.00.00.AA top(1) cumulative patch
PHCO_22763 B.10.00.00.AA cu(1) cumulative patch
PHCO_22770 B.10.00.00.AA cumulative cron/at/crontab patch
PHCO_22849 B.10.00.00.AA ex(1),vi(1),expreserve(1) cumulative patch
PHCO_23091 B.10.00.00.AA man(1) patch
PHCO_23261 B.10.01.15 HP Disk Array Utilities w/AutoRAID Manager
PHCO_23321 B.10.00.00.AA kermit(1) cumulative patch
PHCO_25107 B.10.00.00.AA lpspool subsystem cumulative patch
PHKL_13017 B.10.00.00.AA Autochanger panic cumulative patch
PHKL_13488 B.10.00.00.AA fuser(1M) misses processes blocked on fifo open.
PHKL_13608 B.10.00.00.AA Message queue hang
PHKL_13934 B.10.00.00.AA mprotect, spinlock cumulative patch
PHKL_14062 B.10.00.00.AA HP-PB scsi3, STK9710, DLT cumulative patch
PHKL_14531 B.10.00.00.AA chown() limit, auditing, utime cumulative patch
PHKL_14668 B.10.00.00.AA System Panic: "swap device error" patch
PHKL_14823 B.10.00.00.AA scsi1,disc3,disc30,sar cumulative patch
PHKL_15498 B.10.00.00.AA UFS, VxFS, buffer cache cumulative patch
PHKL_15739 B.10.00.00.AA To resolve disquota panic
PHKL_15763 B.10.00.00.AA timer_settime, alarm, nanosleep cumulative patch
PHKL_15884 B.10.00.00.AA mmap/munmap, no ACLs on JFS cumulative patch
PHKL_22670 B.10.00.00.AA PC floppy cumulative patch
PHKL_23513 B.10.00.00.AA Adv. JFS,CD-ROM,PM,VM,LVM,VxFS cumulative patch
PHKL_5775 B.10.00.00.AA Panic on MP system when abort of busy print job
PHNE_11466 B.10.00.00.AA 5.65 sendmail(1M) cumulative patch
PHNE_13618 B.10.00.00.AA r-commands cummulative patch
PHNE_14086 B.10.00.00.AA cumulative inetd(1M) patch
PHNE_15285 B.10.00.00.AA 10.01 ppl general patch
PHNE_15984 B.10.00.00.AA HP-PB FDDI B.10.01.01 product cumulative patch
PHNE_16000 B.10.00.00.AA NFS Kernel Cumulative Megapatch
PHNE_16655 B.10.00.00.AA ping general patch
PHNE_16726 B.10.00.00.AA vacation patch
PHNE_16753 B.10.00.00.AA traceroute general patch
PHNE_16932 B.10.00.00.AA nettl patch fixes date and time problems.
PHNE_17248 B.10.00.00.AA NFS/NIS cumulative megapatch
PHNE_20188 B.10.00.00.AA cumulative ARPA Transport patch
PHNE_20504 B.10.00.00.AA elm(1) cumulative
PHNE_23277 B.10.00.00.AA BIND 4.9.7 components
PHNE_23717 B.10.00.00.AA NTP timeservices upgrade plus utilities
PHNE_23947 B.10.00.00.AA cumulative ftp(1) and ftpd(1M) patch
PHNE_24383 B.10.00.00.AA gated(1M) cumulative patch
PHNE_24820 B.10.00.00.AA telnetd(1M) cumulative patch
PHSS_10559 B.10.00.00.AA HP DCE/9000 1.4 cumulative patch
PHSS_11795 B.10.00.00.AA OmniBackII A.02.50 patch
PHSS_14401 B.10.00.00.AA Cumulative Online Diagnostic Tools Patch
PHSS_14507 B.10.00.00.AA 10.10 LIBCL cumulative patch
PHSS_14978 B.10.00.00.AA PDCINFO patch Version A.02.24
PHSS_15314 B.10.00.00.AA `freedisk' tool Year 2000 patch
PHSS_15430 B.10.00.00.AA XClients June 1998 Cumulative Patch
PHSS_16646 B.10.00.00.AA Receiver Services October 1998 Patch
PHSS_17225 B.10.00.00.AA dld.sl(5) cumulative patch
PHSS_17493 B.10.00.00.AA Predictive C.10.[0,A-H,M-R]1 cumulative patch
PHSS_17874 B.10.00.00.AA 10.10 10.20 Assembler patch
PHSS_18298 B.10.00.00.AA HP C++ runtime libraries (CC A.10.45)
PHSS_20607 B.10.00.00.AA millicode library (milli.a) cumulative patch
PHSS_21110 B.10.00.00.AA ld(1) and som tools cumulative patch
PHSS_21662 B.10.00.00.AA AudioSubsystem June 2000 Periodic Patch
PHSS_21668 B.10.00.00.AA Screencapture June 2000 Periodic Patch
PHSS_21955 B.10.00.00.AA X11R5/Motif1.2 Runtime AUG2000 Patch
PHSS_22354 B.10.00.00.AA HP aC++ -AA runtime libraries (aCC A.01.30)
PHSS_22753 B.10.00.00.AA ImagingSubsystem Dec 2000 Periodic Patch
PHSS_25713 B.10.00.00.AA Shared libF90 B.10.20.12 (post [10.20.19])
PHSS_6823 B.10.00.00.AA s700_800 10.X OmniBackII A.01.30 patch
PHSS_9397 B.10.00.00.AA HP_UX VM for Java Environment


ioscan:

Class I H/W Path Driver S/W State H/W Type Description
=========================================================================
bc 0 root CLAIMED BUS_NEXUS
bc 1 8 ccio CLAIMED BUS_NEXUS I/O Adapter
ext_bus 9 8/0 c720 CLAIMED INTERFACE GSC add-on Fast/Wide SCSI Interface
ext_bus 10 8/4 c720 CLAIMED INTERFACE GSC add-on Fast/Wide SCSI Interface
ext_bus 11 8/8 c720 CLAIMED INTERFACE GSC add-on Fast/Wide SCSI Interface
ext_bus 12 8/12 c720 CLAIMED INTERFACE GSC add-on Fast/Wide SCSI Interface
bc 2 10 ccio CLAIMED BUS_NEXUS I/O Adapter
ext_bus 0 10/0 c720 CLAIMED INTERFACE GSC built-in Fast/Wide SCSI Interface
target 0 10/0.2 tgt CLAIMED DEVICE
tape 11 10/0.2.0 stape CLAIMED DEVICE Quantum DLT4000
/dev/rmt/6m /dev/rmt/8m /dev/rmt/c0t2d0BEST
/dev/rmt/6mb /dev/rmt/8mb /dev/rmt/c0t2d0BESTb
/dev/rmt/6mn /dev/rmt/8mn /dev/rmt/c0t2d0BESTn
/dev/rmt/6mnb /dev/rmt/8mnb /dev/rmt/c0t2d0BESTnb
target 1 10/0.5 tgt CLAIMED DEVICE
disk 0 10/0.5.0 sdisk CLAIMED DEVICE SEAGATE ST34371W
/dev/dsk/c0t5d0 /dev/rdsk/c0t5d0
target 2 10/0.6 tgt CLAIMED DEVICE
disk 1 10/0.6.0 sdisk CLAIMED DEVICE SEAGATE ST34371W
/dev/dsk/c0t6d0 /dev/rdsk/c0t6d0
target 3 10/0.12 tgt CLAIMED DEVICE
disk 12 10/0.12.0 sdisk CLAIMED DEVICE SEAGATE ST15150W
/dev/dsk/c0t12d0 /dev/rdsk/c0t12d0
bc 3 10/4 bc CLAIMED BUS_NEXUS Bus Converter
tty 0 10/4/0 mux2 CLAIMED INTERFACE MUX
/dev/cua0p7 /dev/diag/tty0p15 /dev/tty0p0 /dev/tty0p4
/dev/cul0p7 /dev/diag/tty0p2 /dev/tty0p1 /dev/tty0p5
/dev/diag/mux0 /dev/diag/tty0p3 /dev/tty0p10 /dev/tty0p6
/dev/diag/tty0p0 /dev/diag/tty0p4 /dev/tty0p11 /dev/tty0p7
/dev/diag/tty0p1 /dev/diag/tty0p5 /dev/tty0p12 /dev/tty0p8
/dev/diag/tty0p10 /dev/diag/tty0p6 /dev/tty0p13 /dev/tty0p9
/dev/diag/tty0p11 /dev/diag/tty0p7 /dev/tty0p14 /dev/ttyd0p7
/dev/diag/tty0p12 /dev/diag/tty0p8 /dev/tty0p15
/dev/diag/tty0p13 /dev/diag/tty0p9 /dev/tty0p2
/dev/diag/tty0p14 /dev/mux0 /dev/tty0p3
ext_bus 2 10/4/4 scsi3 CLAIMED INTERFACE HP 28696A - Wide SCSI ID=7
target 4 10/4/4.6 target CLAIMED DEVICE
disk 2 10/4/4.6.0 disc3 CLAIMED DEVICE DGC C2300WDR5
/dev/dsk/c2t6d0 /dev/rdsk/c2t6d0
/dev/floppy/c2t6d0 /dev/rfloppy/c2t6d0
disk 3 10/4/4.6.1 disc3 CLAIMED DEVICE DGC C2300WDR5
/dev/dsk/c2t6d1 /dev/rdsk/c2t6d1
/dev/floppy/c2t6d1 /dev/rfloppy/c2t6d1
ext_bus 1 10/4/8 scsi1 CLAIMED INTERFACE HP 28655A - SCSI Interface
target 5 10/4/8.0 target CLAIMED DEVICE
tape 2 10/4/8.0.0 tape2 CLAIMED DEVICE HP C1537A
/dev/diag/rmt/c1t0d0 /dev/rmt/2mn /dev/rmt/c1t0d0BESTb
/dev/rmt/2m /dev/rmt/2mnb /dev/rmt/c1t0d0BESTn
/dev/rmt/2mb /dev/rmt/c1t0d0BEST /dev/rmt/c1t0d0BESTnb
ext_bus 5 10/4/9 lpr2 CLAIMED INTERFACE HP 28655A - Parallel Interface
/dev/c5t0d0_lp /dev/diag/c5t0d0_lp
ext_bus 6 10/4/12 scsi3 CLAIMED INTERFACE HP 28696A - Wide SCSI ID=7
target 6 10/4/12.5 target CLAIMED DEVICE
disk 4 10/4/12.5.0 disc3 CLAIMED DEVICE DGC C2300WDR5
/dev/dsk/c6t5d0 /dev/rdsk/c6t5d0
/dev/floppy/c6t5d0 /dev/rfloppy/c6t5d0
disk 5 10/4/12.5.1 disc3 CLAIMED DEVICE DGC C2300WDR5
/dev/dsk/c6t5d1 /dev/rdsk/c6t5d1
/dev/floppy/c6t5d1 /dev/rfloppy/c6t5d1
ext_bus 13 10/4/16 scsi1 CLAIMED INTERFACE HP 28655A - SCSI Interface
ext_bus 14 10/4/17 lpr2 CLAIMED INTERFACE HP 28655A - Parallel Interface
/dev/c14t0d0_lp /dev/diag/c14t0d0_lp
ba 0 10/12 bus_adapter CLAIMED BUS_NEXUS Core I/O Adapter
ext_bus 4 10/12/0 CentIf CLAIMED INTERFACE Built-in Parallel Interface
/dev/c4t0d0_lp
ext_bus 3 10/12/5 c720 CLAIMED INTERFACE Built-in SCSI
lan 1 10/12/6 lan2 CLAIMED INTERFACE Built-in LAN
/dev/diag/lan1 /dev/ether1 /dev/lan1
ps2 0 10/12/7 ps2 CLAIMED INTERFACE Built-in Keyboard/Mouse
/dev/ps2_0 /dev/ps2_1 /dev/ps2kbd /dev/ps2mouse
bc 4 10/16 bc CLAIMED BUS_NEXUS Bus Converter
ext_bus 7 10/16/4 scsi3 CLAIMED INTERFACE HP 28696A - Wide SCSI ID=7
target 10 10/16/4.5 target CLAIMED DEVICE
disk 6 10/16/4.5.0 disc3 CLAIMED DEVICE DGC C2300WDR5
/dev/dsk/c7t5d0 /dev/rdsk/c7t5d0
/dev/floppy/c7t5d0 /dev/rfloppy/c7t5d0
disk 7 10/16/4.5.1 disc3 CLAIMED DEVICE DGC C2300WDR5
/dev/dsk/c7t5d1 /dev/rdsk/c7t5d1
/dev/floppy/c7t5d1 /dev/rfloppy/c7t5d1
ext_bus 8 10/16/12 scsi3 CLAIMED INTERFACE HP 28696A - Wide SCSI ID=7
target 11 10/16/12.6 target CLAIMED DEVICE
disk 8 10/16/12.6.0 disc3 CLAIMED DEVICE DGC C2300WDR5
/dev/dsk/c8t6d0 /dev/rdsk/c8t6d0
/dev/floppy/c8t6d0 /dev/rfloppy/c8t6d0
disk 9 10/16/12.6.1 disc3 CLAIMED DEVICE DGC C2300WDR5
/dev/dsk/c8t6d1 /dev/rdsk/c8t6d1
/dev/floppy/c8t6d1 /dev/rfloppy/c8t6d1
processor 0 32 processor CLAIMED PROCESSOR Processor
processor 1 34 processor CLAIMED PROCESSOR Processor
processor 2 36 processor CLAIMED PROCESSOR Processor
processor 3 38 processor CLAIMED PROCESSOR Processor
memory 0 49 memory CLAIMED MEMORY Memory
Torsten.
Acclaimed Contributor

Re: DLT drive makes K420 reboot when accessed

WOW, 10.01 must be unsupported for at least 10 years now!
Forget to ask somebody about drivers - this is just too old!

You have mixed the tape drive with disks on the same bus - I would suggest to use another controller just for the tape.

Hope this helps!
Regards
Torsten.

__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.

__________________________________________________
No support by private messages. Please ask the forum!

If you feel this was helpful please click the KUDOS! thumb below!   
Stephanie L Davenport
Frequent Advisor

Re: DLT drive makes K420 reboot when accessed

I would love to be able to upgrade these machines but, it is not possible at this time. :) They are being decommissioned as of Feb 09. So, I have to keep them up and running till then.

We have changed the drives, tapes, cables and the cards in the machine. We have also tried different connections and buses. The exact same thing happens every time we try to write to a DLT drive (either DLT4000D or DLT4000DC).

Any ideas why the DDS2 tapes would work but not the DLT?

Steph
Bill Hassell
Honored Contributor

Re: DLT drive makes K420 reboot when accessed

> the machine reboots

That is another term for system crash. Until you get a crash dump, it will be impossible to tell what is bad. You may have a failed backplane in the K420, or a failure in the SCSI interface that causes the (very old) drivers to crash the kernel. Check if you have a ts99 file (10.01 is so old, I can't remember whether this file is created).


Bill Hassell, sysadmin
Torsten.
Acclaimed Contributor

Re: DLT drive makes K420 reboot when accessed

You have a HSC expansion card with 4 F/W SCSI interfaces:

ext_bus 9 8/0 c720 CLAIMED INTERFACE GSC add-on Fast/Wide SCSI Interface
ext_bus 10 8/4 c720 CLAIMED INTERFACE GSC add-on Fast/Wide SCSI Interface
ext_bus 11 8/8 c720 CLAIMED INTERFACE GSC add-on Fast/Wide SCSI Interface
ext_bus 12 8/12 c720 CLAIMED INTERFACE GSC add-on Fast/Wide SCSI Interface

Did you try to connect the tape drive there instead of the core SCSI?

IIRC there were some issues with some controller types and DLT drives in the past, but after all the years I can't remember more details.

Hope this helps!
Regards
Torsten.

__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.

__________________________________________________
No support by private messages. Please ask the forum!

If you feel this was helpful please click the KUDOS! thumb below!   
Sharma Sanjeev
Respected Contributor

Re: DLT drive makes K420 reboot when accessed

Hi Stephanie L Davenport

Please check the Power source of DLT Drive

Regards
Sanjeev
Everything is Possible as " IMPOSSIBLE" word itself says I M POSSIBLE
Stephanie L Davenport
Frequent Advisor

Re: DLT drive makes K420 reboot when accessed

The machine is fine as long as you don't try to write to one of the DLT tape drives. The DDS2 tape drives work correctly. The tape drives, cables, SCSI "card", core I/O board and terminators have all been replaced. We even tried different DLT tape drives with different types of SCSI connections. The only thing left is the back plane. I will have the current sysadmin try that.
Thanks!