Dne 14.5.2018 v 02:47 Pankaj Agarwal napsal(a):
Hi,
How do i set the nr_request value for LV's as it's not writable like other
drives on a linux system.
LV's are set as dm-0 and dm-1 on my system.
#cat /sys/block/dm-0/queue/nr_requests
128
# echo 256 > /sys/block/dm-0/queue/nr_requests
-bash: echo: write error: Invalid argument
#
Hi
Lvm2 is 'logical volume manager' - so it really is just managing your metadata.
So you basically ask how you change this value for 'DM' device (managed by lvm2).
And IMHO my answer would be - you can't change this setting for DM device as
you use whatever comes from the layer bellow DM - so i.e. if you use PV as
/dev/sdb - you need to set this setting for your /dev/sdb device.
Regards
Zdenek
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