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4-12 Normal Operations 601354 Rev A
until the Archive Media Class AX fill level reaches the low
mark threshold of 48 media (= 200 * 0.40 * 0.60 = Media Class
Group A capacity * Archive Media Class AX % * Archive
Media Class AX low mark %). In this case, 16 media are
migrated to Archive Media Class AY.
Now assume that the Archive Media Class AY fill level was at
the low mark threshold of 48 media (= 200 * 0.40 * 0.60). Note
that the Archive Media Class AY high mark threshold is 56
media (= 200 * 0.40 * 0.70). When migration from Archive X
occurs, at least 16 media are transferred. Therefore, migration
from AX to AY causes the Archive Media Class AY fill level to
reach its high mark sleuthed. Migration between Archive Media
Class AY and Archive Media Class AZ begins. In this example,
all 16 media migrated from Archive Media Class AX to
Archive Media Class AY is also migrated to Archive Media
Class AZ, provided enough space is available in Archive Media
Class AZ.
Archive Media Class AZ can contain a maximum of 40 media
(= 200 * 0.20). For media migration to complete, the Archive
Media Class AZ fill level must contain 24 or fewer media.
Otherwise, migration fails for those media that cannot be
transferred.
Modify Media
Migration Policy
Media migration descriptions in “Media Type Migration” on
page 3-29 and “Media Class Migration” on page 3-27 address
initial media migration planning. However, it may be necessary
to periodically modify parameters that control migration. Such
parameters are the media type high mark and low mark and the
media class percentage, high mark and low mark.