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host utilities, red hat, rhel, linux, 9.4, netapp, ontap, rhel
Describes how to use Red Hat Enterprise Linux 9.4 with ONTAP

Use Red Hat Enterprise Linux 9.4 with ONTAP

You can use the ONTAP SAN host configuration settings to configure Red Hat Enterprise Linux 9.4 with ONTAP as the target.

Install the Linux Unified Host Utilities

SAN Tool Kit

In the following example, the sanlun lun show command returns LUN information.

# sanlun lun show all

Example output:

controller(7mode/E-Series)/            device     host               lun
vserver(cDOT/FlashRay)   lun-pathname  filename   adapter  protocol  size    Product
------------------------------------------------------------------------------------
vs_147_32glpe	         /vol/vol1/lun	 /dev/sdb	Host11  FCP        10g	cDOT
vs_147_32glpe	         /vol/vol1/lun	 /dev/sdx	Host11  FCP        10g	cDOT
vs_147_32glpe	         /vol/vol2/lun	 /dev/sdbt  host12 FCP        10g	cDOT
vs_147_32glpe	         /vol/vol2/lun	 /dev/sdax	host12  FCP        10g	cDOT

SAN booting

What you’ll need

If you decide to use SAN booting, it must be supported by your configuration. You can use the NetApp Interoperability Matrix Tool to verify that your OS, HBA, HBA firmware and the HBA boot BIOS, and the ONTAP version are supported.

Multipathing

For Red Hat Enterprise Linux (RHEL) 9.4, the /etc/multipath.conf file must exist, but you do not need to make specific changes to the file. RHEL 9.4 is compiled with all the settings that are required to recognize and correctly manage ONTAP LUNs.

# multipath -ll
3600a098038314359725d516c69733471 dm-22 NETAPP,LUN C-Mode
size=160G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw
`-+- policy='service-time 0' prio=50 status=active
|- 11:0:3:0	sdau 66:224 active ready running
|- 12:0:4:0	sdco 69:192 active ready running
|- 12:0:0:0	sdav 66:240 active ready running
`- 11:0:2:0	sdat 66:208 active ready running
# multipath -ll
3600a0980383149764b5d567257516273 dm-0 NETAPP,LUN C-Mode
size=150G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| |- 16:0:3:0  sdcg 69:64  active ready running
| `- 10:0:0:0  sdb  8:16   active ready running
`-+- policy='service-time 0' prio=10 status=enabled
  |- 10:0:1:0  sdc  8:32   active ready running
  `- 16:0:2:0  sdcf 69:48  active ready running

Recommended settings

The RHEL 9.4 OS is compiled to recognize ONTAP LUNs and automatically set all configuration parameters correctly for both ASA and non-ASA configurations. You can further optimize performance for your host configuration with the following recommended settings.

Parameter Setting

detect_prio

yes

dev_loss_tmo

"infinity"

failback

immediate

fast_io_fail_tmo

5

features

"2 pg_init_retries 50"

flush_on_last_del

"yes"

hardware_handler

"0"

no_path_retry

queue

path_checker

"tur"

path_grouping_policy

"group_by_prio"

path_selector

"service-time 0"

polling_interval

5

prio

"ontap"

product

LUN.*

retain_attached_hw_handler

yes

rr_weight

"uniform"

user_friendly_names

no

vendor

NETAPP
Example

The following example shows how to correct an overridden default. In this case, the multipath.conf file defines values for path_checker and no_path_retry that are not compatible with ONTAP LUNs. If they cannot be removed because other SAN arrays are still attached to the host, these parameters can be corrected specifically for ONTAP LUNs with a device stanza.

defaults {
   path_checker      readsector0
   no_path_retry     fail
}

devices {
   device {
      vendor         "NETAPP  "
      product         "LUN.*"
      no_path_retry    queue
      path_checker     tur
   }
}

Known issues

There are no known issues for the FC host configuration for RHEL 9.4 with ONTAP release.