HP StorageWorks Scalable File Share - Manual (Page 346)

File system configuration examples C–4
C.2 SFS20 storage examples
Example C-3 shows a file system that is not optimally configured. The example is taken from a system where
SFS20 storage is used. The configuration has the following problems:
• There are two LUNs on each of two of the arrays. HP does not recommend creating more than one
OST LUN on an array attached to Object Storage Servers, as such a configuration results in poor
performance.
• The OST LUNs are of varying sizes. It is better to have LUNs of the same size in the file system.
• An
A1
port (
scsi-1/1
) and an
A2
port (
scsi-1/2
) are preferred to the same server; this is not a
recommended configuration.
• An
A1
port and an
A2
port on the
south3
and
south4
servers are connected to different arrays (the
wiring configuration is not correct).
Example C-3 SFS20 file system example — incorrect configuration
sfs> show filesystem gm_south
Name: gm_south
OSTs: ost[3-7]
State: stopped
Mountpoint: /mnt/gm_south/
Stripe size: 4194304
Stripe count: 4
Interconnect: elan tcp
MDS mount options: acl,user_xattr
OST mount options: extents
Lustre timeout: 200
Quota options: quotaon=ug
MDS Information:
Name LUN Array Controller Files Used Service State Running on
----- --- ----- ---------- -------- ---- ------------- ----------
mds2 5 -- 469M 0% running south2
OST Information:
Name LUN Array Controller Size(GB) Used Service State Running on
----- --- ----- ---------- -------- ---- ------------- ----------
ost4 9 3 scsi-1/1 1024 5% running south3
ost5 13 4 scsi-1/1 980 5% running south4
ost6 10 3 scsi-1/2 1024 5% running south4
ost7 14 4 scsi-1/2 980 5% running south3
ost8 11 5 scsi-2/1 2048 5% running south4
ost9 12 6 scsi-2/2 2048 5% running south3
sfs>
Example C-4 shows a better configuration for the same file system.
Example C-4 SFS20 file system example — good configuration
sfs> show filesystem gm_south
Name: gm_south
OSTs: ost[3-7]
State: stopped
Mountpoint: /mnt/gm_south/
Stripe size: 4194304
Stripe count: 4