Hub/Switch Installation Guide

Chapter 1 HPSS Basics

HPSS Installation Guide September 2002 35

Release 4.5, Revision 2

1.3.6 HPSS Management Interface

HPSS provides a powerful SSM administration and operations GUI through the use of the Sammi

product from Kinesix Corporation. Detailed information about Sammi can be found in the Sammi

Runtime Reference, Sammi User’s Guide, and Sammi System Administrator’s Guide.

SSMsimpliﬁes themanagementof HPSSby organizinga broadrangeof technicaldatainto aseries

of easy-to-read graphic displays. SSM allows monitoring and control of virtually all HPSS

processesand resourcesfromwindowsthatcaneasilybe added,deleted, moved,or overlappedas

desired.

HPSS also provides a command line SSM interface, hpssadm. This tool does not provide all the

functionality of theGUI, but does implement asubset of its frequentlyusedfeatures,such as some

monitoring and some control of servers, devices, storage classes, volumes, and alarms. It is useful

for performing HPSS administration from remote locations where X trafﬁc is slow, difﬁcult, or

impossible,such asfromhome orfromscripts. Additionally, hpssadm providessomerudimentary

mass conﬁguration support bymeans of the ability to issue conﬁgurationcommands from a batch

script.

1.3.7 HPSS Policy Modules

There are a number of aspects of storage management that probably will differ at each HPSS site.

For instance, sites typically have their own guidelines or policies covering the implementation of

accounting, security, and other storage management operations. In order to accommodate site-

speciﬁc policies, HPSS has implemented ﬂexible interfaces to its servers to allow local sites the

freedom to tailor management operations to meet their particular needs.

HPSSpoliciesareimplementedusingtwodifferentapproaches.Undertheﬁrstapproach—usedfor

migration, purge,andloggingpolicies—sites areprovided with alarge number of parameters that

may be used to implement local policy. Under the second approach, HPSS communicates

information through a well-deﬁned interface to a policy software module that can be completely

replaced by a site. Under both approaches, HPSS provides a default policy set for users.

• Migration Policy. The migration policy deﬁnesthe conditions underwhich data is copied

fromone level in astorage hierarchyto one or more lower levels. Eachstorage class that is

tohave datacopiedfromthatstorage classtoa lowerlevel inthehierarchyhasa migration

policyassociatedwithit.TheMPSusesthispolicytocontrolwhenﬁlesarecopiedandhow

much data is copied from the storage class in a given migration run. Migration runs are

started automatically by the MPS based upon parameters in the migration policy.

Note that the number of copies which migration makes and the location of these copies is

determined by the deﬁnition of the storage hierarchy and not by the migration policy.

• Purge Policy. The purge policy deﬁnes the conditions under which data that has already

been migrated from a disk storage class can be deleted. Purge applies only to disk storage

classes. Each disk storage class which has a migration policy should also have a purge

policy. Purge runs are started automatically by the MPS based upon parameters in the

purge policy.