Computer Drive User Manual
Table Of Contents
- Chapter 1. HPSS 7.1 Configuration Overview
- Chapter 2. Security and System Access
- Chapter 3. Using SSM
- 3.1. The SSM System Manager
- 3.2. Quick Startup of hpssgui
- 3.3. Configuration and Startup of hpssgui and hpssadm
- 3.4. Multiple SSM Sessions
- 3.5. SSM Window Conventions
- 3.6. Common Window Elements
- 3.7. Help Menu Overview
- 3.8. Monitor, Operations and Configure Menus Overview
- 3.9. SSM Specific Windows
- 3.10. SSM List Preferences
- Chapter 4. Global & Subsystem Configuration
- 4.1. Global Configuration Window
- 4.2. Storage Subsystems
- 4.2.1. Subsystems List Window
- 4.2.2. Creating a New Storage Subsystem
- 4.2.3. Storage Subsystem Configuration Window
- 4.2.3.1. Create Storage Subsystem Metadata
- 4.2.3.2. Create Storage Subsystem Configuration
- 4.2.3.3. Create Storage Subsystem Servers
- 4.2.3.4. Assign a Gatekeeper if Required
- 4.2.3.5. Assign Storage Resources to the Storage Subsystem
- 4.2.3.6. Create Storage Subsystem Fileset and Junction
- 4.2.3.7. Migration and Purge Policy Overrides
- 4.2.3.8. Storage Class Threshold Overrides
- 4.2.4. Modifying a Storage Subsystem
- 4.2.5. Deleting a Storage Subsystem
- Chapter 5. HPSS Servers
- 5.1. Server List
- 5.1. Server Configuration
- 5.1.1. Common Server Configuration
- 5.1.1. Core Server Specific Configuration
- 5.1.2. Gatekeeper Specific Configuration
- 5.1.3. Location Server Additional Configuration
- 5.1.4. Log Client Specific Configuration
- 5.1.1. Log Daemon Specific Configuration
- 5.1.2. Migration/Purge Server (MPS) Specific Configuration
- 5.1.3. Mover Specific Configuration
- 5.1.3.1. Mover Specific Configuration Window
- 5.1.3.1. Additional Mover Configuration
- 5.1.3.1.1. /etc/services, /etc/inetd.conf, and /etc/xinetd.d
- 5.1.3.1.2. The Mover Encryption Key Files
- 5.1.3.1.3. /var/hpss/etc Files Required for Remote Mover
- 5.1.3.1.1. System Configuration Parameters on IRIX, Solaris, and Linux
- 5.1.3.1.1. Setting Up Remote Movers with mkhpss
- 5.1.3.1.2. Mover Configuration to Support Local File Transfer
- 5.1.1. Physical Volume Repository (PVR) Specific Configuration
- 5.1.1. Deleting a Server Configuration
- 5.1. Monitoring Server Information
- 5.1.1. Basic Server Information
- 5.1.1. Specific Server Information
- 5.1.1.1. Core Server Information Window
- 5.1.1.1. Gatekeeper Information Window
- 5.1.1.1. Location Server Information Window
- 5.1.1.2. Migration/Purge Server Information Window
- 5.1.1.3. Mover Information Window
- 5.1.1.1. Physical Volume Library (PVL) Information Window
- 5.1.1.2. Physical Volume Repository (PVR) Information Windows
- 5.1. Real-Time Monitoring (RTM)
- 5.2. Starting HPSS
- 5.1. Stopping HPSS
- 5.2. Server Repair and Reinitialization
- 5.1. Forcing an SSM Connection
- Chapter 6. Storage Configuration
- 6.1. Storage Classes
- 6.2. Storage Hierarchies
- 6.3. Classes of Service
- 6.4. Migration Policies
- 6.5. Purge Policies
- 6.6. File Families
- Chapter 7. Device and Drive Management
- Chapter 8. Volume and Storage Management
- 8.1. Adding Storage Space
- 8.2. Removing Storage Space
- 8.3. Monitoring Storage Space
- 8.4. Dealing with a Space Shortage
- 8.5. Volume Management
- 8.6. Monitoring and Managing Volume Mounts
- 8.7. New Storage Technology Insertion
- Chapter 9. Logging and Status
- Chapter 10. Filesets and Junctions
- Chapter 11. Files, Directories and Objects by SOID
- Chapter 12. Tape Aggregation
- Chapter 13. User Accounts and Accounting
- Chapter 14. User Interfaces
- Chapter 15. Backup and Recovery
- Chapter 16. Management Tools
VVs, fragmentation of the volumes may make it difficult to find space for a new segment. Setting
Average Number of Storage Segments to a larger value will increase the number of segments occupied
by files, and decrease the segment size. Fragmentation of the volumes will be reduced, but the amount of
metadata required to describe the files will be increased.
Conversely, if files are small relative to the size of the disk VVs, smaller values of Average Number of
Storage Segments increase the size of the storage segments, and decrease the number of segments
occupied by each file. This reduces the metadata storage requirements of the file.
The number of segments in small HPSS files can have a significant impact on transfer performance. To
maximize the transfer performance, set this value to 1. Keep in mind that this will result in less effective
disk space utilization. On average, you will use only 50% of your disk space with this selection.
Storage Segment Size
Media Type. The media type of all volumes in the storage class.
Media Block Size (MBS). The Media Block Size is the size in bytes of a physical data block on the
media. For disk, the value must be a multiple of the physical block size used by the disk hardware. For
example, if the disk hardware stores data in 512-byte sectors, 2048 would be a valid entry in this field,
but 2000 would not.
Advice - The Media Block Size should be set to a value appropriate for the volume type. See the HPSS
Installation Guide, Section 3.10.1.1: Media Block Size Selection for some recommendations.
VV Block Size (VVBS). The virtual volume block size is the number of bytes written to an element of a
striped VV before the data stream moves to the next stripe element. It can be thought of as the stride
length of striped data transfer operations. The length of the VV block has an effect on the striping
efficiency. Short VV blocks cause more protocol overhead when writing striped devices. In non-striped
applications, VV Block Size has little meaning so any convenient multiple of the Media Block Size will
do.
Advice - When choosing a VV Block Size, the administrator should consider the characteristics of any
data source or sink that will be copied to or from. Best performance of striped copies usually occurs
when the VV Block Sizes of the source and sink are equal. This minimizes the data movement protocol
overhead and helps to keep the data streams flowing smoothly.
VV Block Size must be an integer multiple of the Media Block Size.
See the HPSS Installation Guide, Section 3.10.1.2: Virtual Volume Block Size Selection (disk) and
Section 3.10.1.3: Virtual Volume Block Size Selection (tape) for information.
Stripe Width (SW). The number of Physical Volumes in a Virtual Volume in this Storage Class.
PV Size (PVSIZE). The size of the disk volume in bytes.
VV Size (VVSIZE). The virtual volume size. The product of the PV Size (PVSIZE) and the Stripe
Width (SW).
Stripe Length (SL). The Stripe Length is the product of the VV Block Size (VVBS) and the Stripe
Width (SW).
Min Multiplier (MINMULT). The Min Storage Segment Size (MINSEG) field is set to the product of
this value and Stripe Length (SL).
HPSS Management Guide November 2009
Release 7.3 (Revision 1.0) 161