Ubuntu
linux package

  1. Bionic (18.04)
  2. Bug #1758466
  3. Comment #0

Comment 0 for bug 1758466

Revision history for this message
Phil Sweeney (3-launchpa9-9) wrote : default io_timeout for nvme is 255 on AWS

According to AWS docs, using newer instance types that use NVME drivers (c5/m5), the io timeout should be set to maximum (ideally 4294967295).
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/nvme-ebs-volumes.html

It appears this is done for 16.04, but in 18.04 it is the default.

Test done by spinning up an m5.large instance in ap-southeast-2.

Ubuntu 16.04 AMI on AWS (latest AMI - 20180126):

$ cat /sys/module/nvme/parameters/io_timeout
4294967295

$ uname -r
4.4.0-1049-aws

Ubuntu 18.04 AMI on AWS (latest nightly AMI - 20180323):

$ cat /sys/module/nvme_core/parameters/io_timeout
255

$ uname -r
4.15.0-1001-aws

Perhaps as part of the move to nvme_core this got lost.