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I just started migration of AWS EC2 T2 to T3 instances. I want to create udev rule which detects disk resize.
I created new rule
SUBSYSTEM=="block", ACTION=="change", ENV{RESIZE}=="1", RUN+="/usr/bin/logger -t udev-subsystem-nvme %k - serial:$attr{serial} - resize:%E{RESIZE} - id_serial:%E{ID_SERIAL} - devname:%E{DEVNAME}"`
in /etc/udev/rules.d/99-disk.rules hit udevadm control --reload-rules && udevadm trigger and watched changes in udevadm monitor and /var/log/syslog
That worked in T2 instance, but does not work in T3 instance. So I tried many different options, see
SUBSYSTEM=="nvme",RUN+="/usr/bin/logger -t udev-subsystem-nvme %k - serial:$attr{serial} - resize:%E{RESIZE} - id_serial:%E{ID_SERIAL} - devname:%E{DEVNAME}"
SUBSYSTEM=="block",RUN+="/usr/bin/logger -t udev-subsystem-block %k - serial:$attr{serial} - resize:%E{RESIZE} - id_serial:%E{ID_SERIAL} - devname:%E{DEVNAME}"
KERNEL=="nvme*",RUN+="/usr/bin/logger -t udev-kernel0 %k - serial:$attr{serial} - resize:%E{RESIZE} - id_serial:%E{ID_SERIAL} - devname:%E{DEVNAME}"
KERNEL=="nvme[0-9]*n[0-9]*",RUN+="/usr/bin/logger -t udev-kernel1 %k - serial:$attr{serial} - resize:%E{RESIZE} - id_serial:%E{ID_SERIAL} - devname:%E{DEVNAME}"
but none of them works. I can detect event of new disk attached, but can't detect disk resize.
It was tried with latest Ubuntu 18.04 AMI and latest Amazon AMI.
Will be very grateful for any advice, because I am starting to be little desperate (:
Maros Mitucha
Posted 2019-04-15T14:24:39.633
Reputation: 31
Are T2 instances using SCSI or NVMe storage? – user1686 – 2019-04-15T14:27:13.313
On T2 instances EBS volumes are not exposed as NVMe block devices, so I guess SCSI can be. You can see it as
/dev/xvd[a-f]On T3 you see EBS volumes as/dev/nvme[0-26]n1– Maros Mitucha – 2019-04-15T16:19:59.597