User's Manual
Table Of Contents
- Preface
- Online Archiving with AMASS 1
- Accessing the Storage Network 2
- Technical Support 3
- Preface
- Online Archiving with AMASS
- Accessing the Storage Network
- Technical Support
- Glossary
- AMASS®
- API
- appended files
- archive
- backup
- bar code
- BFS
- bitfile
- bitfile ID
- cache
- cleaning group
- client
- DAS™
- DataClass group
- DataMgr™
- dead space
- DLT™
- DMFS
- drive pool
- drives
- Ethernet
- FCB
- FDDI
- file
- file import
- file replication
- FileServ™
- file system
- File System Database
- GUI
- HSM
- inode
- IP address
- IPI
- Journal
- jukebox
- label
- library
- mailbox
- media
- metadata
- migration
- multi-tier migration
- NFS
- NIS
- nonresident file
- optical
- Offline Media Manager
- RAID
- resident file
- RPC
- scattered writes
- SCSI Fast/Wide
- server
- SLD
- slot
- SMP
- space pool
- SSD
- standalone drives
- Storage Area Network
- storage policy
- striping
- stub file
- TCP/IP
- thrashing
- truncate
- UNIX™
- VBS
- volume
- volume group
- volume number
- VolServ™
- Windows NT™
- XDI
- Index

AMASS Overview
6-00026-01 Rev A Online Archiving with AMASS 1-17
Tape Streaming
Improves Write
Performance
Streaming tape IO provides a constant flow of data output to a
drive, which lessens start and stop operations. This feature
typically improves write performance but depends on file size,
number of files, and drive type.
During processing, a cache block has the following three states
described:
• Queued = Cache block of data waiting for IO to start
• Pending = Cache block of data in the drives’s buffer
• Done = Cache blocks that have been verified as written to
media
The following figure illustrates these three states:
Tape streaming is configured globally with the config_prod
-o
script after you install AMASS. For more information about
this script, refer to the Optional Parameters appendix in
Installing AMASS.
Refer to the AMASS Release Notes for a list of valid drives for
I/O tape streaming.
2. ... one block in the
drive’s buffer is freed-up
so data continues to be
written to the drive.
Drive
1. As one block of
data is written to
media ...
QUEUED PENDING
DONE
D
A
T
A
IN
C
A
C
HE