sys_attrs_lsm(5)sys_attrs_lsm(5)NAMEsys_attrs_lsm - lsm subsystem attributes
DESCRIPTION
This reference page lists and describes attributes for the Logical
Storage Manager (lsm) kernel subsystem. Refer to sys_attrs(5) for an
introduction to the topic of kernel subsystem attributes.
A value that enables (1) or disables (0) statistics gathering by
LSM software.
Default: 1 (enabled)
Disabling LSM statistics gathering is not recommended. It pro‐
vides a marginal performance improvement that is useful only for
certain types of benchmarking operations. This attribute con‐
trols an I/O policy for LSM mirrored volume I/O.
Disabled: 0 (default)
Enabled: 1
This attribute allows the underlying I/O subsystem to avoid
retries on device failures if there is another active mirror to
service the I/O request. Doing so avoids potentially costly
time delays on some I/O failures.
A value that sets (1) or unsets (0, the default) reduced locking
on multiple-CPU systems (such as a GS1280) by reducing the need
for certain spin locks in the kernel. This results in less LSM
kernel I/O spinlock contention. Using this spin lock performance
feature reduces some of the debugging statistics that are nor‐
mally maintained.
When this attribute is set to 1, you cannot reduce the number of
daemons (with the voliod command) to 0, even with the force
option. See voliod(8).
A value set by the subsystem software to indicate whether the
root (/) file system is on an LSM volume. The following values
are set by the subsystem: If the root file is not on an LSM vol‐
ume. If the root file is on an LSM volume.
Do not modify the value for this attribute unless instructed to
do so by support personnel or by patch kit instructions.
SEE ALSOsys_attrs(5)sys_attrs_lsm(5)
