07-20-2009
fssnap ioctl error
For some reason when I try to take a snapshot of the root slice on a particular machine I get an ioctl 22 error. I can't seem to find much on the problem by searching the internet other than some realtime processes such as ntp that use mlock can cause this to happen. I tried running it with truss and found nothing different other that the ioctl 22 when compared to the output of truss on a machine where I am able to take a snapshot. I even tried doing it from single user mode. The only thing I can think of is the root volume is a UFS filesystem managed by veritas volume manager. Any suggestions will be greatly appreciated.
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LEARN ABOUT SUNOS
lgrp_init
lgrp_init(3LGRP) lgrp_init(3LGRP)
NAME
lgrp_init - initialize lgroup interface
SYNOPSIS
cc [ flag... ] file... -llgrp [ library... ]
#include <sys/lgrp_user.h>
lgrp_cookie_t lgrp_init(lgrp_view_t view);
The lgrp_init() function initializes the lgroup interface and takes a snapshot of the lgroup hierarchy with the given view. If the given
view is LGRP_VIEW_CALLER, the snapshot contains only the resources that are available to the caller (for example, with respect to processor
sets). When the view is LGRP_VIEW_OS, the snapshot contains what is available to the operating system.
Given the view, lgrp_init() returns a cookie representing this snapshot of the lgroup hierarchy. This cookie should be used with other rou-
tines in the lgroup interface needing the lgroup hierarchy. The lgrp_fini(3LGRP) function should be called with the cookie when it is no
longer needed.
The lgroup hiearchy represents the latency topology of the machine. The hierarchy is simplified to be a tree and can be used to find the
nearest resources.
The lgroup hiearchy consists of a root lgroup, which is the maximum bounding locality group of the system, contains all the CPU and memory
resources of the machine, and may contain other locality groups that contain CPUs and memory within a smaller locality. The leaf lgroups
contain resources within the smallest latency.
The resources of a given lgroup come directly from the lgroup itself or from leaf lgroups contained within the lgroup. Leaf lgroups
directly contain their own resources and do not encapsulate any other lgroups.
The lgroup hierarchy can be used to find the nearest resources. From a given lgroup, the closest resources can be found in the lgroup
itself. After that, the next nearest resources can be found in its parent lgroup, and so on until the root lgroup is reached where all the
resources of the machine are located.
Upon successful completion, lgrp_init() returns a cookie. Otherwise it returns LGRP_COOKIE_NONE and sets errno to indicate the error.
The lgrp_init() function will fail if:
EINVAL The view is not valid.
ENOMEM There was not enough memory to allocate the snapshot of the lgroup hierarchy.
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
lgrp_children(3LGRP), lgrp_cookie_stale(3LGRP), lgrp_cpus(3LGRP), lgrp_fini(3LGRP), lgrp_mem_size(3LGRP), lgrp_nlgrps(3LGRP), lgrp_par-
ents(3LGRP), lgrp_resources(3LGRP), lgrp_root(3LGRP), lgrp_view(3LGRP), liblgrp(3LIB), attributes(5)
26 Jan 2005 lgrp_init(3LGRP)