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I am setting a value in /sys/block/xxx/queue/max_sectors_kb in order to try and resolve an iSCSI IO site limit bug and have found the value to revert to its default 32767 as soon as the iSCSI disk is used.
I am setting both manually and with udev rules but the same thing happens, my value of 512 gets replaced again with 32767 which causes IO errors and failure when I am creating a new VM on the iSCSI disk.
This issue has been seen before:
https://forum.proxmox.com/threads/troubles-iscsi-and-max_sectors_kb.25750/
It seems it can be solved on a udev script but you must consider:
udev script might interpret redirection symbol ">" as a command parameter; then just call a regular bash script from the udev script and set the value there.
when the disk is "plugged/first used" the value is created then the corresponding udev script must be sure that it does its job "after" the disk connection process is finished.
