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10-12-2004 08:06 PM
10-12-2004 08:06 PM
StorageWorks DAT40 on SCSI bus where there is a disk
Hi.
I am just reading the "Before you start" notes on the "Getting started guide" that came with the HP StorageWorks DAT 40 tape drive (C5687C).
It states: "Do not attach the drive to the same SCSI bus as a your disk drive".
I wonder if it is just a performance optimization suggestion or a must.
I have no other possibility but to add the DAT to the same an ONLY external SCSI bus where there already is a SUN ultraSCSI DISK.
Here is (part of) the output from ioscan -f:
ext_bus 0 0/0/1/0 c720 CLAIMED INTERFACE SCSI C896 Fast Wide LVD
target 6 0/0/1/0.3 tgt NO_HW DEVICE
tape 0 0/0/1/0.3.0 stape NO_HW DEVICE HP C5683A
target 7 0/0/1/0.4 tgt CLAIMED DEVICE
disk 2 0/0/1/0.4.0 sdisk CLAIMED DEVICE SEAGATE ST318203LSUN18G
target 0 0/0/1/0.7 tgt CLAIMED DEVICE
ctl 0 0/0/1/0.7.0 sctl CLAIMED DEVICE Initiator
ext_bus 1 0/0/1/1 c720 CLAIMED INTERFACE SCSI C896 Ultra Wide Single-Ended
target 1 0/0/1/1.2 tgt CLAIMED DEVICE
disk 0 0/0/1/1.2.0 sdisk CLAIMED DEVICE SEAGATE ST318404LC
target 2 0/0/1/1.7 tgt CLAIMED DEVICE
ctl 1 0/0/1/1.7.0 sctl CLAIMED DEVICE Initiator
ext_bus 2 0/0/2/0 c720 CLAIMED INTERFACE SCSI C875 Ultra Wide Single-Ended
target 3 0/0/2/0.7 tgt CLAIMED DEVICE
ctl 2 0/0/2/0.7.0 sctl CLAIMED DEVICE Initiator
ext_bus 3 0/0/2/1 c720 CLAIMED INTERFACE SCSI C875 Ultra Wide Single-Ended
target 4 0/0/2/1.2 tgt CLAIMED DEVICE
disk 1 0/0/2/1.2.0 sdisk CLAIMED DEVICE HP DVD-ROM 305
target 5 0/0/2/1.7 tgt CLAIMED DEVICE
ctl 3 0/0/2/1.7.0 sctl CLAIMED DEVICE Initiator
After some experiments I was able to add and see the tape alone, and the disk alone, but not together (ioscan output). I figured out the problem in the wrong cable I was given to connect the two devices, but before requesting the purchase of the correct LDV/SE HD68M/M cable (C2978B) I want to be sure that the two devices can co-exist.
Thank you in advance for answers.
Franco Sicoli
I am just reading the "Before you start" notes on the "Getting started guide" that came with the HP StorageWorks DAT 40 tape drive (C5687C).
It states: "Do not attach the drive to the same SCSI bus as a your disk drive".
I wonder if it is just a performance optimization suggestion or a must.
I have no other possibility but to add the DAT to the same an ONLY external SCSI bus where there already is a SUN ultraSCSI DISK.
Here is (part of) the output from ioscan -f:
ext_bus 0 0/0/1/0 c720 CLAIMED INTERFACE SCSI C896 Fast Wide LVD
target 6 0/0/1/0.3 tgt NO_HW DEVICE
tape 0 0/0/1/0.3.0 stape NO_HW DEVICE HP C5683A
target 7 0/0/1/0.4 tgt CLAIMED DEVICE
disk 2 0/0/1/0.4.0 sdisk CLAIMED DEVICE SEAGATE ST318203LSUN18G
target 0 0/0/1/0.7 tgt CLAIMED DEVICE
ctl 0 0/0/1/0.7.0 sctl CLAIMED DEVICE Initiator
ext_bus 1 0/0/1/1 c720 CLAIMED INTERFACE SCSI C896 Ultra Wide Single-Ended
target 1 0/0/1/1.2 tgt CLAIMED DEVICE
disk 0 0/0/1/1.2.0 sdisk CLAIMED DEVICE SEAGATE ST318404LC
target 2 0/0/1/1.7 tgt CLAIMED DEVICE
ctl 1 0/0/1/1.7.0 sctl CLAIMED DEVICE Initiator
ext_bus 2 0/0/2/0 c720 CLAIMED INTERFACE SCSI C875 Ultra Wide Single-Ended
target 3 0/0/2/0.7 tgt CLAIMED DEVICE
ctl 2 0/0/2/0.7.0 sctl CLAIMED DEVICE Initiator
ext_bus 3 0/0/2/1 c720 CLAIMED INTERFACE SCSI C875 Ultra Wide Single-Ended
target 4 0/0/2/1.2 tgt CLAIMED DEVICE
disk 1 0/0/2/1.2.0 sdisk CLAIMED DEVICE HP DVD-ROM 305
target 5 0/0/2/1.7 tgt CLAIMED DEVICE
ctl 3 0/0/2/1.7.0 sctl CLAIMED DEVICE Initiator
After some experiments I was able to add and see the tape alone, and the disk alone, but not together (ioscan output). I figured out the problem in the wrong cable I was given to connect the two devices, but before requesting the purchase of the correct LDV/SE HD68M/M cable (C2978B) I want to be sure that the two devices can co-exist.
Thank you in advance for answers.
Franco Sicoli
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10-19-2004 11:24 PM
10-19-2004 11:24 PM
Re: StorageWorks DAT40 on SCSI bus where there is a disk
I experienced myself a connection of a disk and a tape in the same bus. Different environment, different OS (Solaris), different disk and tape drive, but I believe that my experience can be valid anywhere.
No problem for Solaris to see the devices. Problems arises when accessing in the same time disk and tape: Write operation to disk and/or tape drive suddenly fail, generating strange error messages. Tried for a month, never been able to complete a backup job of less than 5 GB.
My conclusion is that this recomendation is not for performance issue.
It's a must if you want to make your system reliable.
Claudio
No problem for Solaris to see the devices. Problems arises when accessing in the same time disk and tape: Write operation to disk and/or tape drive suddenly fail, generating strange error messages. Tried for a month, never been able to complete a backup job of less than 5 GB.
My conclusion is that this recomendation is not for performance issue.
It's a must if you want to make your system reliable.
Claudio
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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