02-23-2006
Epilog
OK, so I have a window with glance running to watch the internal operations of my dd command. The top few lines of glance are activity bars showing overall system utilization. For hours, disk usage was at 100%. Then I noticed that it dropped to 0. No disk utilization at all. Did my dd finish? Nope. It is still running. Both of my file pointers froze at exactly 34359738368. I allowed this situation to persist for a hour or so, mostly because I was busy with something else. Then I killed the dd command. I am certain it would have "ran" for another 4 days if I have let it. Or another 4 years. glance said that dd was in I/O wait and that (to me) points the finger towards the driver. If a gigabyte is 2^30, then 34359738368 is exactly 32 GB. That is a larger number than will fit into 32 bits. So the kernel, the driver, and dd are all in 64 bit mode. But apparently, the driver bumped into some other limit.
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systemd-machine-id-commit.service
SYSTEMD-MACHINE-ID-COMMIT.SERVICE(8) systemd-machine-id-commit.service SYSTEMD-MACHINE-ID-COMMIT.SERVICE(8)
NAME
systemd-machine-id-commit.service - Commit a transient machine ID to disk
SYNOPSIS
systemd-machine-id-commit.service
DESCRIPTION
systemd-machine-id-commit.service is an early boot service responsible for committing transient /etc/machine-id files to a writable disk
file system. See machine-id(5) for more information about machine IDs.
This service is started after local-fs.target in case /etc/machine-id is a mount point of its own (usually from a memory file system such
as "tmpfs") and /etc is writable. The service will invoke systemd-machine-id-setup --commit, which writes the current transient machine ID
to disk and unmount the /etc/machine-id file in a race-free manner to ensure that file is always valid and accessible for other processes.
See systemd-machine-id-setup(1) for details.
The main use case of this service are systems where /etc/machine-id is read-only and initially not initialized. In this case, the system
manager will generate a transient machine ID file on a memory file system, and mount it over /etc/machine-id, during the early boot phase.
This service is then invoked in a later boot phase, as soon as /etc has been remounted writable and the ID may thus be committed to disk to
make it permanent.
SEE ALSO
systemd(1), systemd-machine-id-setup(1), machine-id(5), systemd-firstboot(1)
systemd 237 SYSTEMD-MACHINE-ID-COMMIT.SERVICE(8)