Dears,
I decided to create an iSCSI target with ctld on FreeBSD 12.2-RELEASE for use with Windows 10 in order to avoid using the SATA controller on the Windows 10 (buggy controller implementation causes DPC watchdog violations that I cannot otherwise override). Instead of using just an SMB share, I opted for the iSCSI target because that way the disk will appear as a local disk to Windows, allowing me to make directory "junctions", which, to the programs accessing them, behave like hardlinks even if they are cross-device.
All went well, the target is usable and automatically mounts and everything. Except that I noticed unexpected behavior that I cannot find the cause of. If I write something with Windows to the iSCSI target and then quickly read it with Windows, I may not get all of the data that I wrote. And on one occasion, I believe, this effect persisted even in the morning: I had saved a file in the evening, opened it in the morning, and the last part of the file wasn't there (although it was in the translation memory, indicating that I had, in fact, processed that part of the file).
I have disabled write caching in Windows for the volume in question and set volmode=dev at the FreeBSD end. The target is a dataset in a mirror zpool. The question is: what am I missing here?
And in case anyone is wondering why I have compression on even if I am using it as a block device and will not see any increased capacity due to the compression, it is to reduce the amount of data written to the SSDs.
Ever thankful for insights.
I decided to create an iSCSI target with ctld on FreeBSD 12.2-RELEASE for use with Windows 10 in order to avoid using the SATA controller on the Windows 10 (buggy controller implementation causes DPC watchdog violations that I cannot otherwise override). Instead of using just an SMB share, I opted for the iSCSI target because that way the disk will appear as a local disk to Windows, allowing me to make directory "junctions", which, to the programs accessing them, behave like hardlinks even if they are cross-device.
All went well, the target is usable and automatically mounts and everything. Except that I noticed unexpected behavior that I cannot find the cause of. If I write something with Windows to the iSCSI target and then quickly read it with Windows, I may not get all of the data that I wrote. And on one occasion, I believe, this effect persisted even in the morning: I had saved a file in the evening, opened it in the morning, and the last part of the file wasn't there (although it was in the translation memory, indicating that I had, in fact, processed that part of the file).
I have disabled write caching in Windows for the volume in question and set volmode=dev at the FreeBSD end. The target is a dataset in a mirror zpool. The question is: what am I missing here?
And in case anyone is wondering why I have compression on even if I am using it as a block device and will not see any increased capacity due to the compression, it is to reduce the amount of data written to the SSDs.
Ever thankful for insights.
root@r720:~ # zpool list MSItank
Code:
NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
MSItank 952G 306G 646G - - 4% 32% 1.00x ONLINE -root@r720:~ # zfs list MSItank/iscsi
Code:
NAME USED AVAIL REFER MOUNTPOINT
MSItank/iscsi 897G 617G 306G -root@r720:~ # zfs get all MSItank/iscsi
Code:
NAME PROPERTY VALUE SOURCE
MSItank/iscsi type volume -
MSItank/iscsi creation Mon Nov 16 12:00 2020 -
MSItank/iscsi used 897G -
MSItank/iscsi available 617G -
MSItank/iscsi referenced 306G -
MSItank/iscsi compressratio 1.03x -
MSItank/iscsi reservation none default
MSItank/iscsi volsize 870G local
MSItank/iscsi volblocksize 8K default
MSItank/iscsi checksum on default
MSItank/iscsi compression lz4 local
MSItank/iscsi readonly off default
MSItank/iscsi createtxg 17 -
MSItank/iscsi copies 1 default
MSItank/iscsi refreservation 897G local
MSItank/iscsi guid 13433521980867327650 -
MSItank/iscsi primarycache all default
MSItank/iscsi secondarycache all default
MSItank/iscsi usedbysnapshots 0 -
MSItank/iscsi usedbydataset 306G -
MSItank/iscsi usedbychildren 0 -
MSItank/iscsi usedbyrefreservation 592G -
MSItank/iscsi logbias latency default
MSItank/iscsi objsetid 387 -
MSItank/iscsi dedup off default
MSItank/iscsi mlslabel -
MSItank/iscsi sync standard default
MSItank/iscsi refcompressratio 1.03x -
MSItank/iscsi written 306G -
MSItank/iscsi logicalused 310G -
MSItank/iscsi logicalreferenced 310G -
MSItank/iscsi volmode dev local
MSItank/iscsi snapshot_limit none default
MSItank/iscsi snapshot_count none default
MSItank/iscsi redundant_metadata all default