The partition is sitting on a RAID 6 sas disk array. All the other filesystems on the array are fine... Hardware diags are clean for the controller and no failed disks.
When you say
and it also produced a dead "xfs_df -i -p xfs_check -c check /dev/sdd1"
* Sorry, there was a typo there. It should read xfs_db not xfs_df...
When I run xfs_check on /dev/sdd1, nothing reports. From another terminal, when I do ps ax|grep xfs, I see the xfs_db as D and xfs_check as sleeping.
Nothing in dmesg or /var/log/messages outside the normal "Starting FXS recovery on filesystem: sdd1 (logdev: internal)"... no disk activity either.
Almost like there is something in the journal log causing it to hang on recovery...
A mount with -o ro,norecovery works. I am copying the files now before I 'experiment' on this volume any further.
Real puzzler here.
Thanks so much! :-)