I have an iSCSI disk at /dev/rdsk/c5t6d0I have made a partition (slice with UEFI label) at: /dev/rdsk/c5t6d0s0Now I write some data to the slice:echo xyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxy >/textdd if=/text of=/dev/dsk/c5t6d0s0If I dump the disk contents I see the UEFI label and also my data at offset 0x5000:dd if=/dev/rdsk/c5t6d0 bs=512 | xxd0000000: 0000 0000 0000 0000 0000 0000 0000 0000  ................0000010: 0000 0000 0000 0000 0000 0000 0000 0000  ................0000020: 0000 0000 0000 0000 0000 0000 0000 0000  ................0000030: 0000 0000 0000 0000 0000 0000 0000 0000  ................0000040: 0000 0000 0000 0000 0000 0000 0000 0000  ................0000050: 0000 0000 0000 0000 0000 0000 0000 0000  ................0000060: 0000 0000 0000 0000 0000 0000 0000 0000  ...................0000070: 0000 0000 0000 0000 0000 0000 0000 0000  ................0000190: 0000 0000 0000 0000 0000 0000 0000 0000  ................00001a0: 0000 0000 0000 0000 0000 0000 0000 0000  ................00001b0: 0000 0000 0000 0000 0eb5 7760 0000 00ff  ..........w`....00001c0: ffff eeff ffff 0100 0000 ff3f 0300 0000  ...........?....00001d0: 0000 0000 0000 0000 0000 0000 0000 0000  ................00001e0: 0000 0000 0000 0000 0000 0000 0000 0000  ................00001f0: 0000 0000 0000 0000 0000 0000 0000 55aa  ..............U.0000200: 4546 4920 5041 5254 0000 0100 5c00 0000  EFI PART....\...0000210: 7187 d278 0000 0000 0100 0000 0000 0000  q..x............0000220: ff3f 0300 0000 0000 2200 0000 0000 0000  .?.............0000230: de3f 0300 0000 0000 fd59 3d67 51a0 4d13  .?.......Y=gQ.M.0000240: abdd a5e8 8251 c7ac 0200 0000 0000 0000  .....Q..........0000250: 8000 0000 8000 0000 7e8c 8e06 0000 0000  ........~.......0000260: 0000 0000 0000 0000 0000 0000 0000 0000  ................0000270: 0000 0000 0000 0000 0000 0000 0000 0000  ................0000280: 0000 0000 0000 0000 0000 0000 0000 0000  ...................0005000: 7879 7879 7879 7879 7879 7879 7879 7879  xyxyxyxyxyxyxyxy0005010: 7879 7879 7879 7879 7879 7879 7879 7879  xyxyxyxyxyxyxyxy0005020: 7879 7879 7879 7879 7879 7879 7879 7879  xyxyxyxyxyxyxyxy0005030: 7879 7879 7879 7879 7879 7879 0ab6 db6d  xyxyxyxyxyxy...m0005040: 6db6 db6d 6db6 db6d 6db6 db6d 6db6 db6d  m..mm..mm..mm..m0005050: 6db6 db6d 6db6 db6d 6db6 db6d 6db6 db6d  m..mm..mm..mm..m0005060: 6db6 db6d 6db6 db6d 6db6 db6d 6db6 db6d  m..mm..mm..mm..m0005070: 6db6 db6d 6db6 db6d 6db6 db6d 6db6 db6d  m..mm..mm..mm..m0005080: 6db6 db6d 6db6 db6d 6db6 db6d 6db6 db6d  m..mm..mm..mm..m0005090: 6db6 db6d 6db6 db6d 6db6 db6d 6db6 db6d  m..mm..mm..mm..mBut If I do the same dump at storage side (iSCSI target), I do not see my data written!I shutdown the SPARC/solaris machine and voila! the data is now there.How can this be? Is Solaris caching my data in memory? How can I disable this?Note1: I tried to use sync but it did not help and anyway it is related to files in a file-system, which I do not have in my scenario.Note2: My machine is a T5220 UltraSPARC T2 Server with Solaris 11.3Note3: 'storage' is an Ubuntu server with iSCSI-target on local disk backing-store.
Is there disk-level caching in Solaris 11?
caching;solaris;partition;sparc;iscsi