I'm trying to set the readahead for mongo 256 or less as recommended, I looked at the documentation for any guidance and I found this:
Ensure that readahead settings for the block devices that store the database files are appropriate. For random access use patterns, set low readahead values. A readahead of 32 (16kb) often works well. For a standard block device, you can run
sudo blockdev --reportto get the readahead settings and
sudo blockdev --setra <value> <device>to change the readahead settings. Refer to your specific operating system manual for more information.
when I do a
sudo blockdev --report I get:
rw 8192 512 4096 0 32212254720 /dev/sda rw 8192 512 4096 2048 31162630144 /dev/sda1 rw 8192 512 4096 60866560 1048576000 /dev/sda2 rw 8192 512 4096 0 75161927680 /dev/sdb rw 8192 512 4096 2048 75159830528 /dev/sdb1
how do I know which is the one that is related to mongo?