Kernel Bug Tracker – Bug 15566
SCSI Generic queueing info result never indicates direct data transfer?
Last modified: 2014-06-24 17:10:04 UTC
The sg info result never returns a nonzero result despite
SG_FLAG_DIRECT_IO flag and aligned READ_10 and WRITE_10 data buffer.
Is direct io occuring as requested? If not, why not? If so, why
doesn't the info value behave as documented in the HOWTO?
I've run both over usb (which I can understand why not direct) and
to SATA drives that normally work fine with O_DIRECT read/write.
This bug is against obsolete kernel. Try newer kernel to see if
bug is fixed.