Installing ATTO SAS or FC interfaces

These ATTO interfaces add SAS or FC ports to the Mac enabling control of a LTO tape drive or library


ATTO H680

The H680 is a PCIe card with dual 4 port SAS. There are newer 12Gb cards, but LTO SAS is 6Gb so the H680 is perfect. There are also RAID cards like the R680 which will work, but RAID functionality is not required.
If the drive has a Fibre Channel connection then there is an ATTO PCIe FC card.
Note that the ATTO multipath driver does not support tape drives.
Download and install the latest Mac driver and card firmware from the ATTO website.
The PCIe card can go inside the older MacPro or in a Thunderbolt expansion chassis.

When using an R680 or R644 cards with LTO-6 and LTO-7 the link speed should be set to 3Gb/s. See section at bottom of this page.

ATTO ThunderLink SH2068

The SH2068 is a Thunderbolt Interface with dual 4 port SAS.
If the drive has a Fibre Channel connection then there is an ThunderLink FC adaptors.
Note that the ATTO multipath driver does not support tape drives.
Download and install the latest Mac driver and device firmware from the ATTO website.
When using an SH2068 unit with LTO-6 and LTO-7 the link speed should be set to 3Gb/s. See section at bottom of this page.


Checking hardware devices

To check that the Mac can see the ATTO and LTO hardware hold the alt key on the Mac keyboard, click the Apple Menu and select System Information...



Check for PCI devices

If using an ATTO card inside the older MacPro, then select PCI from the left hand Hardware list. The ATTO H680 should be listed.

Check for Thunderbolt devices

If using the ThunderLink or an ATTO card in an expansion chassis, then click Thunderbolt. Here the Sonnet Echo Express Pro is connected to the Mac.


ATTO Driver missing

Now select SAS or Fibre Channel from the Hardware list. Here the driver has not been installed so no devices are shown.

Download and install the Mac driver for the H680 from the ATTO website


ATTO Driver installed

Now the driver is installed and the ATTO ExpressSAS device is shown. No tape drives are connected.


LTO drive connected

Make sure an LTO drive is connected and powered on, now a SCSI Target Device @ 0 is shown. Here an IBM LTO-5 drive is connected.
YoYottaID LTFS will now be able to control this drive.
The System Information page does not refresh automatically. Click File, Refresh Information or cmd R to refresh the hardware listing.


LTO library connected

Here an HPE MSL4048 with three LTO drives is connected. SCSI Target Device @ 0 has two logical units. The first is an LTO-5 drive, the second is the library robot. If two logical units are not shown then the configuration of the tape library needs to be set to allow external control. The setting for the control path are normally in the partition settings for the library.
SCSI Target Devices 1 and 2 are LTO-5 and LTO-4 drives.

YoYottaID Automation will now be able to control this library.


Adjust link speed

There is an read issue with the ATTO SH2068 TB-SAS adaptor and the R680 or R644 PCIe RAID SAS card when controlling LTO-6 and LTO-7 drives.
Files are written correctly, but when read back there are undetected soft errors. So the errors would be missed if the copy was not verified. If you get any verification issues, then check these settings.
The H680 SAS card is not affected.
The current workaround is to set the PHY link speed to 3Gb/s rather than Auto or 6Gb/s.

To do this open the terminal app and type this to display the current R680 settings.
/Applications/ATTO/ExpressSASRAID2/atsasnvr -p

Or type this to display the current ThunderLink settings.
/Applications/ATTO/ThunderLinkSASHBA/atsasnvr -p

Then type one of the following to change the link speed.
/Applications/ATTO/ExpressSASRAID2/atsasnvr -k 3
/Applications/ATTO/ThunderLinkSASHBA/atsasnvr -k 3

Power down the ATTO and restart the Mac.
Then type the first command again to check the new settings they will show PHY Speed: 3 Gb/s


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