I am having a problem creating a udev rule that sets max_sectors_kb to 1024 for sd* (sda,sdb,sdc etc...) devices under /sys/block/.
Specifically, a recent kernel change means the max IO is too large for my iSCSI SAN so I am trying to set it to 1024 on startup.
I have tried the following from articles online, but none seem to have an effect.
ACTION==”add|change”, SUBSYSTEM==”block”, RUN+=”/bin/sh -c ‘/bin/echo 1024 > /sys%p/queue/max_sectors_kb’”
or
ACTION=="add", ENV{ID_FS_USAGE}!="filesystem", ENV{ID_PATH}=="-iscsi-", RUN+="/bin/sh -c 'echo 64 > /sys$DEVPATH/queue/max_sectors_kb'"
When I run cat cat /sys/block/sdX/queue/max_sectors_kb the value is still the 32767 default.
What do I need to do?
Specifically, a recent kernel change means the max IO is too large for my iSCSI SAN so I am trying to set it to 1024 on startup.
I have tried the following from articles online, but none seem to have an effect.
ACTION==”add|change”, SUBSYSTEM==”block”, RUN+=”/bin/sh -c ‘/bin/echo 1024 > /sys%p/queue/max_sectors_kb’”
or
ACTION=="add", ENV{ID_FS_USAGE}!="filesystem", ENV{ID_PATH}=="-iscsi-", RUN+="/bin/sh -c 'echo 64 > /sys$DEVPATH/queue/max_sectors_kb'"
When I run cat cat /sys/block/sdX/queue/max_sectors_kb the value is still the 32767 default.
What do I need to do?