>> развработчики ZFS какие там были - такие по факту и остались
> Ага, Белендорф и его команда.

Так и скажи, что в коммиты не смотрел и вообще, между "разработчик" и "имеющий commit bit" различий не видишь.
Ну давай глянем, чего там за последнюю неделю накоммитили:

https://github.com/openzfs/zfs/commit/114a39964f5c8d89558d28...

zdb: include cloned blocks in block statistics
This gives `zdb -b` support for clone blocks.
...
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Kay Pedersen <mail@mkwg.de>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Sponsored-By: OpenDrives Inc.
Sponsored-By: Klara Inc.
Closes #15123
 Loading branch information
robn committed Aug 1, 2023

https://github.com/openzfs/zfs/commit/b22bab2547b74b5df5e469...

Remove fastwrite mechanism.
Fastwrite was introduced many years ago to improve ZIL writes spread
...
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Wilson <george.wilson@delphix.com>
Signed-off-by:    Alexander Motin <mav@FreeBSD.org>
Sponsored by:    iXsystems, Inc.
amotin committed Jul 28, 2023

https://github.com/openzfs/zfs/commit/5bdfff5cfc8baff48b3b59...

BRT should return EOPNOTSUPP
Return the more descriptive EOPNOTSUPP instead of EXDEV when the
storage pool doesn't support block cloning.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <rob.norris@klarasystems.com>
Signed-off-by: Kay Pedersen <mail@mkwg.de>
Closes #15097
 Loading branch information
oromenahar committed Jul 27, 2023

https://github.com/openzfs/zfs/commit/704c80f0487199a00c3ce5...

Avoid waiting in dmu_sync_late_arrival().
The transaction there does not produce any dirty data or log blocks,
...
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:    Alexander Motin <mav@FreeBSD.org>
Sponsored by:    iXsystems, Inc.

https://github.com/openzfs/zfs/commit/5bdfff5cfc8baff48b3b59...

Remove zl_issuer_lock from zil_suspend().
This locking was recently added as part of #14979. But appears it
...
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:    Alexander Motin <mav@FreeBSD.org>
Sponsored by:    iXsystems, Inc.
Closes #15103
 Loading branch information
amotin committed Jul 25, 2023 

Да-да, все коммиты от rob (а их там много) - это  "Klarasystems: Experts in FreeBSD, ZFS and ARM/Embedded"

И то ли дело пингвинячьи

Revert "Linux 6.5 compat: register_sysctl_table removed
linux/copy_file_range: properly request a fallback copy on Linux <5.3
readmmap.c: fix building with MUSL libc
Linux 4.20 compat: wrapper function for iov_iter type access
Linux 6.4 compat: iter_iov() function now used to get old iov member

вот где развитие так и прет!

>> из IXsystems, freebsd и т.п. А основную разработку, так-же IXSystems осуществляет
> И что полезного сделали ixsystems за последние три года?

Эпик опеннетой ыкспертизы, в общем.