DSS/Db Backups/HSM Overview

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DSS/Db Backups/HSM Overview

• David Wolfe

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DSS-I

• 102 CD ROM set
• POSS-I red XE plates
• SERC-J blue S plates
• Compressed 10X
• http//archive.stsci.edu/cgi-bin/dss_form

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DQVS

• Palomar Quick-V
• GSC-I construction plates
• 39 CD ROM set
• Compressed 10X
• http//archive.stsci.edu/cgi-bin/dss_form

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XDSS

• RED ( III-aF)
• POSS-II XP images
• Completed 897 out of 897, 100
• UK Schmidt XS images
• Completed 592 out of 606, 98
• UK Schmidt ER images
• Completed 270 out of 288, 94
• Compressed 10X
• Contained on Volumes 0001-0390
• Completed by end of 2000
• http//archive.stsci.edu/cgi-bin/dss_form

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XDSS(cont)

• BLUE (III-aJ)
• POSS-II XJ images
• Completed 897 out of 897, 100
• Contained on Volumes 1001-1226
• INFRARED (IVN)
• POSS-II XI images
• Completed 340 out of 897, 38
• Contained on Volumes 2001-2084
• UK Schmidt IS images
• Completed 151 out of 894, 16
• Contained on Volumes 3001-3043
• Compressed 10X
• Completed by mid 2001, telescope limited
• http//archive.stsci.edu/cgi-bin/dss_form

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XDSS(cont)

• Headers
• Headers for all XDSS second generation scans
• ftp//ftp.stsci.edu/software/casb/xdss/

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DB BACKUPS

• DataBase about 1TB
• How to handle such a large volume
• Old method
• Stand alone DLT drive, NT Backup
• 9-10 hours per tape
• 15 tapes

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DB BACKUPS (cont)

• New method
• BackupExec by Veritas
• DLT jukebox, 8 cartridges
• Breakup into North and South
• High through put
• Less user interaction

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DB BACKUPS (cont)

• Importance of the Backups
• Large system, just in case of errors
• Already had to use previous backups
• Replaced corrupted files
• Time Frame
• Plans are for monthly
• Minimal impact to production

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HSM

• Hierarchical Storage Management
• DiskXtender by OTG
• Large storage by using DLT jukeboxes
• 2 - 46 DLT tape jukeboxes
• 60GB/tape
• Storing processing data
• OOP, cutouts, deblend, rank

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HSM (cont)

• Ease of retrieval
• All files visible from explorer
• Right click on file to retrieve
• Limited by physical disk space

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