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Installation guide

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only after all member systems have installed (or upgraded to) Version 1.5
of the appropriate TruCluster software product. To enable extended UID or
GID support, set the enable_extended_uids parameter on every system
as directed in this appendix and reboot every system. Do not use extended
UIDs and GIDs on any member system until you have rebooted the last
member system. Once you have enabled extended UID and GID support in
a cluster, you must not disable it. Disabling this support will disrupt the
operation of your cluster.
Kerberos
Kerberos Version 4 does not support extended UIDs and GIDs. If you use
Kerberos Version 4 and need extended UID and GID support, you should
upgrade to Kerberos Version 5.
System V File System
The System V file system (S5FS) does not support extended UIDs and
GIDs. File system syscall that specifies UIDs and GIDs greater than
65,535 will return an EINVAL error. Users assigned a UID or GID greater
than 65,535 will not be able to create or own files on a System V file
system. Consider using the UFS, MFS, or AdvFS as a solution.
The ls Command
The ls -l command does not display the disk block usage on quota files or
sparse files. This is not a result of the implementation of extended UIDs
and GIDs, but rather a result of the behavior of the ls -l command.
When extended UIDs and GIDs are enabled, quota files and sparse files
may appear much larger than expected. To display the actual disk block
usage for any file, use the ls -s command.
The cp Command
The cp command will incorrectly copy quota files or other sparse files. This
is not a result of the implementation of extended UIDs and GIDs, but
rather a result of the behavior of the cp command when it reads a file.
When extended UIDs and GIDs are enabled, quota files and other sparse
files may be copied to a new file that is much larger than expected. To
correctly copy quota files or other sparse files, use the dd command with
the conv=sparse parameter:
% dd conv=sparse if= inputfile of= outputfile
Administering User Accounts and Groups 9–7