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We have an Eonstor A16U-G2421 SCSI-SATA enclosure. We have had it for a while without issues but it is in a new configuration and perfomance is terrible. IOmeter is reporting 22-24 MBs.
The Eonstor enclosure is attached to the server via an Adaptec 39320A SCSI HBA which is configured according to instructions found on the Infortrend Eonstor Support site.
I think I have tracked down the culprit but don't know how to resolve it. In the RAIDwatch management application which ships with the Eonstor if I go to Configuration --> Channel --> Channel 0 (Host, SCSI, Speed: 40MHz) then I see that the "Current Transfer Clock" is 40 MHz while the "Default Transfer Clock" is 160 MHz.
This fits with what I am seeing. If I was expecting 80-100 MBs over a 160MHz host channel then 22-24 MBs over a 40MHz host channel is about right.
Does anyone hve any idea what would be limiting Channel 0 to 40MHz? Any ideas on what to do to resolve this? None of the config changes I have made in RAIDwatch have made any difference.
Cheers,
Simon
The Eonstor enclosure is attached to the server via an Adaptec 39320A SCSI HBA which is configured according to instructions found on the Infortrend Eonstor Support site.
I think I have tracked down the culprit but don't know how to resolve it. In the RAIDwatch management application which ships with the Eonstor if I go to Configuration --> Channel --> Channel 0 (Host, SCSI, Speed: 40MHz) then I see that the "Current Transfer Clock" is 40 MHz while the "Default Transfer Clock" is 160 MHz.
This fits with what I am seeing. If I was expecting 80-100 MBs over a 160MHz host channel then 22-24 MBs over a 40MHz host channel is about right.
Does anyone hve any idea what would be limiting Channel 0 to 40MHz? Any ideas on what to do to resolve this? None of the config changes I have made in RAIDwatch have made any difference.
Cheers,
Simon