DSS/Db Backups/HSM Overview
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Transcript of 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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