ZFS (DRAID) zabbix - Disk read/write request responses are too high

[temask88]

DRAID 24HDD, 2 cache nvme.

At the time of writing to the pool, the zabbix swears at the read from the pool, although reading at this moment does not occur.

If, at the time of writing to the pool, at the same time, you start reading from it that the problem disappears.

Problem only with writing and no reading.

Zabbix trigger:
min(/zfs-store/vfs.dev.read.await[sdd],15m) > {$VFS.DEV.READ.AWAIT.WARN:"sdd"} or min(/zfs-store/vfs.dev.write.await[sdd],15m) > {$VFS.DEV.WRITE.AWAIT.WARN:"sdd"}

$VFS.DEV.READ.AWAIT.WARN - 20
$VFS.DEV.WRITE.AWAIT.WARN - 20

It is not clear the problem of collection by zabbix or a problem with tuning / optimizing zfs

[temask88]

this is what iostat shows at that moment - no read, write

[temask88]

The question is, is this a normal situation? is it related to the ZFS and CoW?
If so, what is the best way to monitor disk performance?
If not, what is it ?