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hu_rhel_71.html |
host utilities, red hat, rhel, linux, 7.1, netapp, ontap |
Describes how to use Red Hat Enterprise Linux 7.1 with ONTAP |
You can use the ONTAP SAN host configuration settings to configure Red Hat Enterprise Linux 7.1 with ONTAP as the target.
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.
For Red Hat Enterprise Linux (RHEL) 7.1 the /etc/multipath.conf file must exist, but you do not need to make specific changes to the file. RHEL 7.1 is compiled with all settings required to recognize and correctly manage ONTAP LUNs.
# multipath -ll 3600a09803831347657244e527766394e dm-5 NETAPP,LUN C-Mode size=80G features='4 queue_if_no_path pg_init_retries 50 retain_attached_hw_handle' 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 3600a09803831347657244e527766394e dm-5 NETAPP,LUN C-Mode size=80G features='4 queue_if_no_path pg_init_retries 50 retain_attached_hw_handle’ hwhandler='1 alua' wp=rw |-+- policy='service-time 0' prio=50 status=active | |- 11:0:1:0 sdj 8:144 active ready running | |- 11:0:2:0 sdr 65:16 active ready running `-+- policy='service-time 0' prio=10 status=enabled |- 11:0:0:0 sdb 8:i6 active ready running |- 12:0:0:0 sdz 65:144 active ready running
The RHEL 7.1 OS is compiled to recognize ONTAP LUNs and automatically set all configuration parameters correctly for both ASA and non-ASA configuration.
| Parameter | Setting |
|---|---|
detect_prio |
yes |
dev_loss_tmo |
"infinity" |
failback |
immediate |
fast_io_fail_tmo |
5 |
features |
"3 queue_if_no_path 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 |
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
}
}
The RHEL 7.1 with ONTAP release has the following known issues:
| NetApp Bug ID | Title | Description | Bugzilla ID |
|---|---|---|---|
Emulex FCoE (OCe10102-FX-D) host hang or path failures observed during I/O with storage failover operations |
You might observe a host hang or path failures on Emulex 10G FCoE host (OCe10102-FX-D) during I/O with storage failover operations. In such scenarios, you might see the following message: |
||
IP addresses are not always assigned during the boot of a RHEL 7.0 OS installed on an iSCSI multipath’d LUN |
When you install the root(/) on a iSCSI multipath’d LUN, the IP address for the Ethernet interfaces are specified in the kernel command line so that the IP addresses are assigned before the iSCSI service starts. However, dracut cannot assign IP addresses to all the Ethernet ports during the boot, before the iSCSI service starts. This causes the iSCSI login to fail on interfaces without IP addresses. You will see the iSCSI service attempt to login numerous times, which will cause a delay in the OS boot time. |