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host utilities, red hat, rhel, linux, 8.2, netapp, ontap
Describes how to use Red Hat Enterprise Linux 8.2 with ONTAP

Use Red Hat Enterprise Linux 8.2 with ONTAP

You can use the ONTAP SAN host configuration settings to configure Red Hat Enterprise Linux 8.2 with ONTAP as the target.

Install the Linux Unified Host Utilities

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 ONTAP version are supported.

Multipathing

For Red Hat Enterprise Linux (RHEL) 8.2 the /etc/multipath.conf file must exist, but you do not need to make specific changes to the file. RHEL 8.2 is compiled with all the settings required to recognize and correctly manage ONTAP LUNs.

# multipath -ll
3600a098038303634722b4d59646c4436 dm-28 NETAPP,LUN C-Mode
size=80G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw
`-+- policy='service-time 0' prio=50 status=active
  |- 11:0:7:1    sdfi   130:64   active ready running
  |- 11:0:9:1    sdiy   8:288    active ready running
  |- 11:0:10:1   sdml   69:464   active ready running
  |- 11:0:11:1   sdpt   131:304  active ready running
# multipath -ll
3600a098038303634722b4d59646c4436 dm-28 NETAPP,LUN C-Mode
size=80G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| |- 16:0:6:35 sdwb 69:624 active ready running
| |- 16:0:5:35 sdun 66:752 active ready running
`-+- policy='service-time 0' prio=10 status=enabled
|- 15:0:0:35 sdaj 66:48 active ready running
|- 15:0:1:35 sdbx 68:176 active ready running

Recommended settings

The RHEL 8.2 OS is compiled to recognize ONTAP LUNs and automatically set all configuration parameters correctly.

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 of other SAN arrays 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 RHEL 8.2 with ONTAP release.