Disk rescan will change max_sectors_kb to default value

Solution Verified - Updated -

Issue

  • How to make max_sectors_kb persistent for multipath devices. In multipath.conf, max_sectors_kb 4096 was defined. After doing 'systemctl reload multipathd' value of max_sectors_kb turn to 4096 for all disks (the disk sdc is taken for an example).
    If performing disk rescan for sdc , max_sectors_kb will turn back to default value 512
# cat /sys/block/sdc/queue/max_sectors_kb
4096
# echo 1 > /sys/devices/pci0000:00/0000:00:01.0/0000:04:00.0/host0/rport-0:0-0/target0:0:0/0:0:0:1/rescan
# cat /sys/block/sdc/queue/max_sectors_kb
512

  • The issue was seen on RHEL7.3 but not observed on RHEL7.2.

  • How to make make max_sectors_kb parameter persistence ?

Environment

  • Red Hat Enterprise Linux 7.3

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content