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тАО06-30-2010 05:15 AM
тАО06-30-2010 05:15 AM
FC Tape drives unaccessible
Hi there,
WeтАЩve problem accessing tape drives connected to one of the fabrics weтАЩre using. Actually, none of the tape drives connected to first fabric are viewable from our servers, whereas at the same time, the same servers, using the same type of connection (HBA, fibre, SFP, switch, topologyтАж) can access to the other half of tape drives, through the second fabric.
Our SAN is based on 4x switches (StorageWorks 8/80) split into 2x physically independent fabrics (no ISL link between the 2 fabrics). Both fabrics are (almost) symmetric (connections, zoning, FW levelтАж) and the targets accessible through one fabric, are also accessible through the other one. The only known difference is that half of our drives are accessible only through one fabric (HP Ultrium LTO4) whereas the other ones are connected to the second fabric.
WeтАЩve swapped HBA, links, SFP, etcтАж WeтАЩve even tried to force the speed on the HBAs and the switches, without any kind of improvementтАж Do you have any idea?
Any help would be most welcome...
Thx -
WeтАЩve problem accessing tape drives connected to one of the fabrics weтАЩre using. Actually, none of the tape drives connected to first fabric are viewable from our servers, whereas at the same time, the same servers, using the same type of connection (HBA, fibre, SFP, switch, topologyтАж) can access to the other half of tape drives, through the second fabric.
Our SAN is based on 4x switches (StorageWorks 8/80) split into 2x physically independent fabrics (no ISL link between the 2 fabrics). Both fabrics are (almost) symmetric (connections, zoning, FW levelтАж) and the targets accessible through one fabric, are also accessible through the other one. The only known difference is that half of our drives are accessible only through one fabric (HP Ultrium LTO4) whereas the other ones are connected to the second fabric.
WeтАЩve swapped HBA, links, SFP, etcтАж WeтАЩve even tried to force the speed on the HBAs and the switches, without any kind of improvementтАж Do you have any idea?
Any help would be most welcome...
Thx -
3 REPLIES 3
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тАО06-30-2010 04:17 PM
тАО06-30-2010 04:17 PM
Re: FC Tape drives unaccessible
What OS are your servers running??
Have these tapedrives ever been seen from the server?
or are they replacements for malfunctioning devices?
Have these tapedrives ever been seen from the server?
or are they replacements for malfunctioning devices?
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тАО06-30-2010 08:25 PM
тАО06-30-2010 08:25 PM
Re: FC Tape drives unaccessible
There must be a library housing these drives. Depending on the library model (e.g. ESLe, EML, ...) did you present the drives to servers using command view TL?
Hope this helps!
Regards
Torsten.
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Hope this helps!
Regards
Torsten.
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тАО07-01-2010 12:40 AM
тАО07-01-2010 12:40 AM
Re: FC Tape drives unaccessible
WeтАЩve finally found out what is going wrong with one of our fabrics:
Both fabrics are using dual ISL links in failover mode (no trunking) It appears that one of those links is defective (either the SFP or the fibre, we donтАЩt know yet) The tricky point is that the link was good enough to handle disks access, but not for tape drives (streaming devicesтАж)
The only way to discover this failure was to disable the link, and not to swap it with the other ISL links, as we did in the past. Since it is disabled, we managed to rediscover properly all the tape targets on all hosts.
Thx -
Both fabrics are using dual ISL links in failover mode (no trunking) It appears that one of those links is defective (either the SFP or the fibre, we donтАЩt know yet) The tricky point is that the link was good enough to handle disks access, but not for tape drives (streaming devicesтАж)
The only way to discover this failure was to disable the link, and not to swap it with the other ISL links, as we did in the past. Since it is disabled, we managed to rediscover properly all the tape targets on all hosts.
Thx -
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