HP StorageWorks Scalable File Share - Manual (Page 99)

Creating a file System — SFS20 storage 5–15
The configuration shown in this example would allow you to create an MDS service that uses two LUNs, and
four OST services that use one LUN each on the arrays connected to the
south3
,
south4
,
south5
, and
south6
servers. In this situation, you probably do not need to change the role of any of the existing LUNs
and you can proceed to Section 5.2.2 to identify the file system information.
However, in very small HP SFS systems, the default LUN roles that are set by the
configure array
command may be unsuitable. For example, the following system has only two servers and two SFS20 arrays.
sfs> show lun
LUN Array Role Used by Size(GB) Preferred Server Visible to
--- ----- ----- ---------- -------- ---------------- ----------
1 1 service south1 1 - south[1-2]
2 1 adm south1 40
- south[1-2]
3 1 mds - 500 south2 south[1-2]
4 1 mds - 500 south2 south[1-2]
5 2 svcspare - 1 - south[1-2]
6 2 admspare - 40
- south[1-2]
7 2 mds - 500 south2 south[1-2]
8 2 mds - 500 south2 south[1-2]
Arrays 1 and 2 are connected to the MDS server (
south2
); consequently, the
configure array
command automatically assigned a role of MDS to LUNs 3, 4, 7, and 8 (on arrays 1 and 2). To be able to
use LUNs 4 and 8 for OST services, you must change the role of these LUNs from MDS to OST. Use the
set lun
command to change the role, as shown in the following example. Do not specify a user for the
LUN—the user is automatically assigned when the file system is set up (see Section 5.2.3):
sfs> set lun 4 role=ost
sfs> set lun 8 role=ost
Note that if you make a mistake while changing LUN roles, you can use the
set lun
command again to
change the role to another value.
NOTE: You must only change the role of LUNs that are not being used in an existing file system—that is,
the
Used by
field for the LUN must be empty.
Do not change the role of administration (
adm
) or service (
service
) LUNs.
The role of a spare service LUNs (
svcspare
) and the spare administration LUN (
admspare
) can only be
changed if you are replacing an SFS20 storage array.
When you have assigned the LUN roles as necessary, proceed to Section 5.2.2 to identify the file system
information.
5.2.2 Step 2: Identifying file system information — SFS20 storage
NOTE: The short system name (that is, the system name without the domain name) is used in file system
configuration. If you have more than one HP SFS system with the same short system name (for example,
south.my.domain.com
and
south.fs.com
), you must create a nickname for one of the systems. If a
system nickname is needed, create it before you create the file system. See Section 5.9 for information on
how to do this.
The
create filesystem
command is used to set up file systems. A series of questions prompts you to
enter the required information. An example of creating a file system is shown in Section 5.2.3. Before you
set up a file system, identify the information you will need, including the following: