SCSI Cable between StorEdge MultiPack and Ultra 60
Hello everybody
I connected a MultiPack (6 drives, no terminator) to the on-board SCSI port of a Ultra 60 with a 2-meter SCSI cable, it is working.
But I am confused with:
Must I use 0.8m cable for best performance, or must I use it in a cluster environment?
On page 231 of Sun Ultra 60 Service Manual ( <a href="http://docs.sun.com/app/docs/doc/805-1709-12?a=load" target="_blank">http://docs.sun.com/app/docs/doc/805-1709-12?a=load</a> ;), it is said that 0.8m cable and 2m cable are supported.
On page 23 of Sun StorEdge MultiPack User's Guide (<a href="http://www.sun.com/products-n-solutions/hardware/docs/pdf/805-3954-10.pdf " target="_blank"> http://www.sun.com/products-n-solutions/hardware/docs/pdf/80 5-3954-10.pdf</a>), it is said that I can use only 0.8 meter cable to connect to on-board host port.
Now I only have two 2m SCSI cable, and I am going to set up a cluster environment by connecting the MultiPack to another Ultra 60.
Can these two 2m SCSI cable work in a cluster environment? And how does it affect the performance?
Many thanks.
Danny
[1155 byte] By [
DannyFu] at [2007-11-25 23:00:39]
# 1
Go ahead, Danny, and use the 2-meter cable.
The disk peripheral is a Single-Ended SCSI device and that cable length is the recommended maximum for such a device, to avoid data corruption from loss of signal.
Glance through this general primer on the topic:
<a href="http://arstechnica.com/paedia/s/scsi-1.html" target="_blank"><b>Ars Technica - `What Is SCSI`</b></a>
(glance at the third page of that web link)
Officially, you should be at 1.5 meter or less, especially since you are going to use a MULTI pack, and every son-of-a-gun connection and junction and contact has some theoretical mathematical equivalent of inherent cable length.
Consider a special saving account to replace the cable later? <img src="images/smiley_icons/icon_wink.gif" border=0 alt="Wink">
Bill at 2007-7-5 17:49:59 >
# 2
Thanks, Bill,
It is working now, either with 2-meter cable or 0.8meter cable.
Now I am going to buy another Ultra 60 to set up a cluster environment with the existing Ultra 60 and the MultiPack. Before I do this, I downloaded Sun Cluster Server 3.1 09/04 and installed it as a single-node cluster on the existing Ultra60, during the installation, there was a check procedure, and it reported:
CHECK ID : 1398
SEVERITY : HIGH
PROBLEM : An unsupported server is being used as a Sun Cluster 3.x node.
ANALYSIS :
It may not be supported to use this server as a Sun Cluster 3.x node. Only servers that
have been qualified with Sun Cluster 3.x are supported as Sun Cluster 3.x nodes. Server
type in question: Sun Microsystems sun4u Sun Ultra 60 UPA/PCI
If this is just a test environment, can I ignore it and continue the installation?
Another question, if I use VxVM, must I install the VxVM after the cluster server?
Many thanks to Bill.
Danny
# 3
Danny,
Glad to hear the Multipak is functioning as expected.
Cluster questions are beyond the scope of these Hardware forums.
You can consider the Clustering Forum that is offered at this other link, instead...
<a href="http://forum.sun.com/index.jspa" target="_blank">http://forum.sun.com/index.jspa</a>
There are five years of postings available for you to read. <img src="images/smiley_icons/icon_smile.gif" border=0 alt="Smile">
That forum requires a completely different login profile if you hope to participate by posting.All threads are freely available for reading.
I have not had any cluster-specific training, but my guess is that the U-60 is a bit too old to have been qualified for version 3.x of the cluster software suite.That is probably why you see that message.
Perhaps that other forum can suggest other links for more reading.
Bill at 2007-7-5 17:49:59 >
# 4
Thank you, bill, you always reply effectively.I agree with you, I am going to to visit the website you provided to me.Many thanks.Danny
# 5
Although not supported on Ultra 60 it is supported on E220R, according to the link below, which is same motherboard so you may have a shot at getting it to work. I wonder what it uses to determine the difference between U60 & E220R. Audio Module? Graphics?
Sorry Bill. I know it's off topic. I was just curious. I'll shut up now.
<a href="http://www.sun.com/software/cluster/" target="_blank">http://www.sun.com/software/cluster/</a>
jds2n at 2007-7-5 17:49:59 >
# 6
No problem, John.
I had not looked inside any of the cluster documuntation.
However I suspected that Danny's experiments with SC 3.1 would proceed with harmless annoying error messages.
As you've noted, the audio board and UPA graphics are the only U60 things that cannot be in a 220R (no external access for the server chassis), and there's no such thing as a LOM/RSC/Alarms card on that platform, either, so we wouldn't see an identity change as with the SB1000/280R systems.
Bill at 2007-7-5 17:49:59 >
