> For the complete documentation index, see [llms.txt](https://docs.nodeum.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nodeum.io/data-archiving/hybrid-storage-management/tape-library-management/configuring-multipath-failover.md).
# Configuring Multipath Failover
### Prerequisites
All components in the environment should meet the hardware vendor support standards for this feature. This includes the following:
* Fabric switches
* FC HBAs
* Tape library
OS driver levels and firmware levels of FC HBAs, and library and drives should be of supported revisions.
### lin\_tape driver
To use the lin\_tape device driver software, you need to install the driver. NODEUM has been tested with the latest available `lin_tape` driver, `3.0.72`, which can be downloaded and installed from the IBM fix\_central website.
Once you have followed the installation instruction provided by the vendor, you can verify that the driver is well installed:
```bash
$ lsmod |grep -i -E 'st|lin_tape'
lin_tape 483328 4
pfo 1130496 1 lin_tape
st 65536 0
```
You can see mediumx and tape drive devices:
```bash
$ lsscsi -g | grep -i -E 'medium|tape'
[11:0:0:0] tape IBM ULT3580-HH5 F991 - /dev/sg3
[11:0:0:1] mediumx IBM 3573-TL E.20 - /dev/sg4
[11:0:1:0] mediumx ADIC Scalar i500 100A - /dev/sg5
[11:0:2:0] tape IBM ULT3580-HH6 G9P1 - /dev/sg6
$ cat /proc/scsi/IBMchanger
lin_tape version: 3.0.72
lin_tape major number: 237
Attached Changer Devices:
Number model SN HBA SCSI FO Path
0 3573-TL 00L2U78AW009_LL0 qla2xxx 11:0:0:1 NA
1 Scalar i500 VL001AV1506BVV00078 qla2xxx 11:0:1:0 NA
$ cat /proc/scsi/IBMtape
lin_tape version: 3.0.72
lin_tape major number: 237
Attached Tape Devices:
Number model SN HBA SCSI FO Path
0 ULT3580-HH5 90WT013124 qla2xxx 11:0:0:0 NA
1 ULT3580-HH6 90WT054335 qla2xxx 11:0:2:0 NA
```
### NODEUM Tape Library configuration
In following the standard Tape Library configuration, the tape library has to configured with the `lin_tape` library and drive emulation.
For doing this, you need to confirm that beside the defined tape library, the Emulation is set with the `lin_tape` emulation.
This is the same for the Tape Drive(s):
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