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Issue tracker for Fedora CoreOS
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multipath for SCSI disks #321

Open tuan-hoang1 opened 4 years ago

tuan-hoang1 commented 4 years ago

In FCOS, we currently disable multipath with https://github.com/coreos/fedora-coreos-config/blob/cac303b548e196ddb0f33fb9e9656ce52fea9993/manifests/fedora-coreos-base.yaml#L19.

On RHCOS 4.2 on s390x, @steffen-maier and I can bring up multipath devices as /sysroot (bind mounted to /) but growpart does not work by default. Steffen came up with a patch for coreos-growpart. (not growpart itself, which does not support multipath afaiu https://bugs.launchpad.net/nova-dpm/+bug/1750400 https://bugs.launchpad.net/cloud-init/+bug/1556260).

I have not tested on FCOS but should work as the logics in coreos-growpart don't differ much in 2 branches. Testing on FCOS this week...

Searching around I found those for CL: https://github.com/coreos/bugs/issues/2254 https://github.com/coreos/bugs/issues/2556

cc @lucab @ajeddeloh @bgilbert for experiences. cc @jlebon @cgwalters @dustymabe for opinions on x86_64.

Also a side node, with https://github.com/coreos/coreos-installer/pull/105 coming in, we should have s390x's zFCP SCSI code path to be the same as normal code path so things would be more aligned and less troubles for multipathing on s390x. Multipathing on ECKD DASD on s390x is built-in in the hardware if I understand correctly.

tuan-hoang1 commented 4 years ago

I'm finalizing the multipath patch and testing for both x86 and s390x.