On Tue, October 25, 2011 09:42, adele....@oracle.com wrote:
> Hi all,
>
> I have a customer who wants to know what is the max characters allowed
> in creating name for zpool,
>
> Are there any restrictions in using special characters?
255 characters. Try doing a 'man zpool':
Creates a new storage pool containing the virtual devices specified
on the command line. The pool name must begin with a letter, and
can only contain alphanumeric characters as well as underscore
("_"), dash ("-"), and period ("."). The pool names "mirror",
"raidz", "spare" and "log" are reserved, as are names beginning
with the pattern "c[0-9]". The vdev specification is described in
the "Virtual Devices" section.
Or, use the source Luke:
Going to http://src.opensolaris.org, and searching for "zpool" turns up:
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/cmd/zpool/zpool_main.c
Inside of it we have a zpool_do_create() function, which defines a 'char
*poolname' variable. From there we call a zpool_create() in
libzfs/common/libzfs_pool.c to zpool_name_valid() to pool_namecheck(),
where we end up with the following code snippet:
/*
* Make sure the name is not too long.
*
* ZPOOL_MAXNAMELEN is the maximum pool length used in the userland
* which is the same as MAXNAMELEN used in the kernel.
* If ZPOOL_MAXNAMELEN value is changed, make sure to cleanup all
* places using MAXNAMELEN.
*/
if (strlen(pool) >= MAXNAMELEN) {
if (why)
*why = NAME_ERR_TOOLONG;
return (-1);
}
Check the function for further restrictions:
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/common/zfs/zfs_namecheck.c#288
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