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Forum Discussion
Something seems broken with iSCSI since 6.7.0
Upgraded from 6.6.1 stable to 6.7.0 stable yesterday. Since then I can no longer mount my TrueCrypt containers residing on Readynas iSCSI volumes. Or, they mount after several minutes, but I can no l...
Got it!
The iSCSI File is heavily fragmented (over 1 Million Extents!)
I disabled CoW for the file (chattr +C <file>) and defragmented extents smaller than 100M (btrfs fi defrag -f -t 100M /data/RB00_READYNAS01/.iscsi/iscsi_lun_backing_store).
When enough space was freed up (>50GB) I stopped defragmentation and started again but this time for extents smaller than 10G.
I hope the file won't fragment again this heavy after i disabled CoW.
Well, well, well.
iscsi_lun_backing_store: 1616701 extents found
Even though repeated defragging has freed up some space on the drive (835 GB "free" as of now), the originally reported problem still stands: when "sync writes" are disabled, TrueCrypt iSCSI volumes are no longer mountable since 6.7.0.
The issue is still present with 6.8.0 RC1.
Of course, with sync writes on the performance is also truly horrible and the device is practically unusable.
I am eating the consequences of the many bizarre decisions NTGR have taken during the last few years (essentially destroying the potential of capable hardware with horrible software decisions) and will be copying all data off the device, downgrade to OS4 (or fashion some way of forcing Debian on it), and never again buy or recommend a Netgear product in my life.
This ends a 20 year+ old relationship, back to the time where "Bay Networks" was on Netgear products. Good work lads.
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