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тАО03-24-2010 11:28 AM
тАО03-24-2010 11:28 AM
SCSI LVD/SE bus connected to LVD Ultrium920 drive ?
I submitted this question yesterday but it simply got lost, sorry for the duplication if it decides to show up in the forum.
We have an RX2620-2 server with an LVD/SE HDTS68 connector at the back, connected to a 1x8 G2 Autoloader ( with Ultrium920 drive ) with the same type connector through a C2924C cable.
Is this an acceptable configuration ?
The Autoloader documentation says that:
"
NOTE: The host bus adapter should be Low Voltage Differential Signaling (LVDS). A Single-Ended (SE) SCSI host bus adapter works, but severely degrades performance and limits cable length. If any SE devices are on the same parallel SCSI bus, all of the devices on the parallel SCSI bus slow to SE speed, which severely degrades performance. Never attach an LTO-3 or LTO-4 tape drive to an SE SCSI bus.
"
Does this mean our configuration is "bad" ?
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тАО03-25-2010 10:58 AM
тАО03-25-2010 10:58 AM
Re: SCSI LVD/SE bus connected to LVD Ultrium920 drive ?
If you connect any SE devices the HBA switches to SE and everything has to run SE in which case performance will be poor. As long as only LVD devices are present the HBA will run in LVD mode.
You don't say it, but it sounds like the 1/8 G2 is the only device on the bus which is the optimal configuration.
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тАО03-25-2010 01:34 PM
тАО03-25-2010 01:34 PM
Re: SCSI LVD/SE bus connected to LVD Ultrium920 drive ?
There are no other devices on the secondary channel of the SCSI bus, just the autoloader. The two internal disks are on the primary channel.
One other thing which is puzzling me is, I changed the suspect SCSI cable with a new one recently and now the green led on terminator turns off when the SCSI cable is plugged in, it is on when there is no connection, is this normal ? There are no SCSI bus error messages in any of the logs.
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тАО03-25-2010 02:34 PM
тАО03-25-2010 02:34 PM
Re: SCSI LVD/SE bus connected to LVD Ultrium920 drive ?
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тАО03-25-2010 03:13 PM
тАО03-25-2010 03:13 PM
Re: SCSI LVD/SE bus connected to LVD Ultrium920 drive ?
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тАО03-27-2010 04:09 AM - edited тАО05-06-2013 10:44 AM
тАО03-27-2010 04:09 AM - edited тАО05-06-2013 10:44 AM
Re: SCSI LVD/SE bus connected to LVD Ultrium920 drive?
>I submitted this question yesterday but it simply got lost
Are you talking about your other topic:
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тАО03-27-2010 07:02 PM
тАО03-27-2010 07:02 PM
Re: SCSI LVD/SE bus connected to LVD Ultrium920 drive ?
I don't remember a 24 hour delay in any of my previous posts.
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тАО03-28-2010 02:48 AM
тАО03-28-2010 02:48 AM
Re: SCSI LVD/SE bus connected to LVD Ultrium920 drive ?
Delay in what, replies? Remember in the forum, you are depending on the kindness of strangers.
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тАО03-28-2010 08:58 AM
тАО03-28-2010 08:58 AM
Re: SCSI LVD/SE bus connected to LVD Ultrium920 drive ?
About the "strangers":
I can't thank them enough for their sincere help. Some even involved people from the industry to solve my problems. I wish I knew enough to be one of those "strangers".
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тАО03-28-2010 01:12 PM
тАО03-28-2010 01:12 PM
Re: SCSI LVD/SE bus connected to LVD Ultrium920 drive ?
There is no delay. If it isn't there right away, it was never accepted. Especially if there are no error messages.
Your profile contains a list of your threads.