Component File Journaling Options

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Presentation transcript:

Component File Journaling Options Richard Smith 14 September, 2009

Component file layout Free space Global file information (root) 2 1 Free space Global file information (root) Component index blocks Component data (APL arrays) Free space nodes Multiple file writes per update

12.0 journaled update 2 1 Write journal to end of file, which describes the updates Perform updates Clear journal If interrupted, the journal remains present so the update can be redone

Safer journaled updates 2 2 Journaling does not work when disk caches are not flushed Forcing data to be flushed to disk is slow but may be minimised by: Using checksummed components Using checksummed journal

No data loss on OS crash Would require 4 disk cache flushes per update if no checksums Can be achieved with 2 disk cache flushes per update using checksums Can be achieved with 1 disk cache flush per update and repair tool Repair tool can be used with any checksummed component file.

Journaling/checksum choices √ X X √ X √ ? √ ? √ ? √ Compatibility with 11.0 and earlier Compatibility with 12.0 Availability in 12.1

Repair tool demo

Component File Journaling Options Richard Smith 14 September, 2009

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