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Adaptec ASR-6405T, не работает кэш записи?

Установил в домашний сервер контроллер с модулем AFM-600. На сервере работает Proxmox 6.2.
Включил кэширование записи командой arcconf SETCACHE 1 LOGICALDRIVE 0 wbb. Из-за глюка ИБП несколько раз сервер выключался нештатно, и каждый раз бьются данные на диске (таблицы MySQL InnoDB, LVM встаёт в ошибку, не говоря уже об ошибках на EXT4). Что это, нерабочий кэш, или я что-то не так настроил?
Вывод arrconf getconfig 1:
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


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