Adaptec ASR-6405T write cache not working?

Question

RAID

I installed a controller with an AFM-600 module in my home server. The server is running Proxmox 6.2.
Enabled write caching with the arcconf SETCACHE 1 LOGICALDRIVE 0 wbb command . Due to a UPS glitch, the server shut down abnormally several times, and each time the data on the disk is broken (MySQL InnoDB tables, LVM get into an error, not to mention errors on EXT4). What is it, a non-working cache, or have I configured something wrong?
arrconf getconfig 1 output :

Controllers found: 1
----------------------------------------------------------------------
Controller information
----------------------------------------------------------------------
   Controller Status                        : Optimal
   Channel description                      : SAS/SATA
   Controller Model                         : Adaptec 6405T
   Controller Serial Number                 : 1A5111DBD6E
   Physical Slot                            : 16
   Temperature                              : 58 C/ 136 F (Normal)
   Installed memory                         : 512 MB
   Copyback                                 : Disabled
   Background consistency check             : Enabled
   Automatic Failover                       : Enabled
   Global task priority                     : High
   Performance Mode                         : Default/Dynamic
   Stayawake period                         : Disabled
   Spinup limit internal drives             : 0
   Spinup limit external drives             : 0
   Defunct disk drive count                 : 0
   Logical devices/Failed/Degraded          : 1/0/0
   NCQ status                               : Enabled
   Statistics data collection mode          : Enabled
   --------------------------------------------------------
   Controller Version Information
   --------------------------------------------------------
   BIOS                                     : 5.3-0 (19204)
   Firmware                                 : 5.3-0 (19204)
   Driver                                   : 1.2-1 (50877)
   Boot Flash                               : 0.0-0 (19204)
   --------------------------------------------------------
   Controller ZMM Information
   --------------------------------------------------------
   Status                                   : ZMM Optimal

----------------------------------------------------------------------
Logical device information
----------------------------------------------------------------------
Logical device number 0
   Logical device name                      : arr1
   RAID level                               : 1
   Status of logical device                 : Optimal
   Size                                     : 1904630 MB
   Read-cache mode                          : Enabled
   Write-cache mode                         : Enabled (write-back)
   Write-cache setting                      : Enabled (write-back) when protected by battery/ZMM
   Partitioned                              : Yes
   Protected by Hot-Spare                   : No
   Bootable                                 : Yes
   Failed stripes                           : No
   Power settings                           : Disabled
   --------------------------------------------------------
   Logical device segment information
   --------------------------------------------------------
   Segment 0                                : Present (Controller:1,Connector:0,Device:0)      WD-WMC300808700
   Segment 1                                : Present (Controller:1,Connector:0,Device:1)       MK0273YGJ93BVC


----------------------------------------------------------------------
Physical Device information
----------------------------------------------------------------------
      Device #0
         Device is a Hard drive
         State                              : Online
         Supported                          : Yes
         Transfer Speed                     : SATA 6.0 Gb/s
         Reported Channel,Device(T:L)       : 0,0(0:0)
         Reported Location                  : Connector 0, Device 0
         Vendor                             : ATA
         Model                              : WDC WD20EFRX-68A
         Firmware                           : 80.00A80
         Serial number                      : WD-WMC300808700
         Size                               : 1907729 MB
         Write Cache                        : Disabled (write-through)
         FRU                                : None
         S.M.A.R.T.                         : No
         S.M.A.R.T. warnings                : 0
         Power State                        : Full rpm
         Supported Power States             : Full rpm,Powered off
         NCQ status                         : Enabled
      Device #1
         Device is a Hard drive
         State                              : Online
         Supported                          : Yes
         Transfer Speed                     : SATA 6.0 Gb/s
         Reported Channel,Device(T:L)       : 0,1(1:0)
         Reported Location                  : Connector 0, Device 1
         Vendor                             : ATA
         Model                              : Hitachi HUA72302
         Firmware                           : MK7OAA10
         Serial number                      : MK0273YGJ93BVC
         Size                               : 1907728 MB
         Write Cache                        : Disabled (write-through)
         FRU                                : None
         S.M.A.R.T.                         : No
         S.M.A.R.T. warnings                : 0
         Power State                        : Full rpm
         Supported Power States             : Full rpm,Powered off,Reduced rpm
         NCQ status                         : Enabled
      Device #2
         Device is a Hard drive
         State                              : Online (JBOD)
         Supported                          : Yes
         Transfer Speed                     : SATA 6.0 Gb/s
         Reported Channel,Device(T:L)       : 0,3(3:0)
         Reported Location                  : Connector 0, Device 3
         Vendor                             : ATA
         Model                              : Hitachi HDS72302
         Firmware                           : MN6OAA10
         Serial number                      : MN1270FA11896D
         Size                               : 1907729 MB
         Write Cache                        : Disabled (write-through)
         FRU                                : None
         S.M.A.R.T.                         : No
         S.M.A.R.T. warnings                : 0
         Power State                        : Full rpm
         Supported Power States             : Full rpm,Powered off,Reduced rpm
         NCQ status                         : Enabled


Command completed successfully.