Date: Tue, 2 Apr 2019 13:57:58 -0600 From: John Nielsen <lists@jnielsen.net> To: freebsd-hackers@freebsd.org Subject: online resizing NVME drives? Message-ID: <8F7034DD-AA3A-44DF-86D2-34FB6BF60FD7@jnielsen.net>
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Hi all-
Obviously this wouldn't make sense for physical NVME hardware, but when =
running on e.g. bhyve or AWS EC2 it's nice to be able to resize volumes =
and filesystems without needing to reboot the (virtual) system. I'm =
pretty sure that's do-able with SCSI, AHCI SATA and virtio-block devices =
but I don't see a way to do it with NVME. Am I missing something or do =
we need to implement something along the lines of "nvmecontrol rescan"?
I'm experimenting with FreeBSD 12.0-RELEASE on a c5n.large AWS ec2 =
instance. Like most (all?) of the c5 instance types the disks are all =
presented as NVME devices even if they are actually backed by EBS. I =
started one instance with a 10GB root volume but then decided I wanted =
to make it bigger. I grew the volume on the AWS side no problem. When I =
did so I got this kernel message:
nvme0: async event occurred (type 0x2, info 0x00, page 0x00)
Thereafter running "nvmecontrol devlist" correctly showed the increased =
size of the parent device:
# nvmecontrol devlist
nvme0: Amazon Elastic Block Store
nvme0ns1 (25600MB)
However I couldn't see a way to update the size of the nvd0 block device =
without rebooting. Pointers appreciated. Thanks!
JN
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