We have a DAS device (CyberStore 424S-JBOD) connected to our Dell R650xs through a Dell HBA355e card in the server. From fdisk we see duplicate entries for the 16 12T drives, they go from sdc to sdah. We have the drives sdc through sdr configured in a ZFS pool and they’re fine, but I’m pretty sure we’re not getting redundancy from the DAS device if we’re seeing duplicate drive entries from fdisk. I had the assumption that multipath would see the device itself but apparently not. Would anyone be able to point us to some documentation for how to approach this? Thanks!
Do you have multipathd.service running?
What does multipath -l show?
How about ls -l /dev/disk/by-* or blkid?
I had a server + SAN box. The server did see each volume via four iSCSI connections.
Whet multipathd did detect that say sde, sdg, sdi, and sdk were “replicates”, it did
create one more device, like md-7 to represent that multipathed volume. If I had had ZFS,
then I would probably have picked the entry from /dev/disk/by-id that did point to /dev/md-7
to add into the zfs pool.
Thanks for your response @jlehtone. multipathd was running and there were no results from multipath -ll. One of the expansion cards is bad now so we can’t do any further troubleshooting of multipath until it’s replaced as we only have one pathway to the device. I’ll check out the documentation you recommended in the meantime and will look for a replicated device once we’re back up with multiple pathways and will update after that. Thanks again!