read-write-many with iSCSI ontap-san | NetApp | Page 1

cosmic meteor Nov 21, 2024, 7:09 PM

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my environment
OS RHEL 9.4
Rancher RKE2 v1.30.6
Trident version 24.10.0
using iSCSI
3 x CP/etcd nodes
3 x worker nodes
things appear to be working except when I have to reboot a worker node
the pod moves to next available worker node but volume stays stuck with the old node and things get messy
anyone else have had this issue?
maybe if I have read-write-many this will not be an issue? but is that supported with iSCSI backend with ontap-san

cosmic meteor Nov 21, 2024, 11:08 PM

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when I try to create a PVC with read-write-many this is the error:

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Warning ProvisioningFailed 9s (x2 over 17s) csi.trident.netapp.io_trident-controller- failed to provision volume with StorageClass "ontap-san": rpc error: code = InvalidArgument desc = no available storage for access modes: [ReadWriteMany]

gloomy nimbus Nov 22, 2024, 8:16 AM

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Which filesystem are you using on your iSCSI LUN?

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because for read-write-many on SAN you need a cluster filesystem otherwise you will lose data

covert delta Dec 2, 2024, 3:11 PM

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https://docs.netapp.com/us-en/trident/trident-use/ontap-san.html shows that iSCSI only allows RWO and RWOP

ONTAP SAN driver overview

Learn about configuring an ONTAP backend with ONTAP SAN drivers.

#read-write-many with iSCSI ontap-san