HP X9320 Manual do Utilizador descarregar pdf (Página 115)

There is no guarantee as to the order in which the two rules will be executed; therefore, the final

destination is ambiguous because multiple rules can apply to the same file.

Example 2:

Rules can cause data movement in both directions, which can lead to issues. In the following

example, the rules specify that all .doc files in tier 1 to be moved to tier 2 and all .jpg files in

tier 2 be moved to tier 1. However, this might not succeed, depending on how full the tiers are.

# ibrix_migrator -A -f ifs2 -r ' name = "*.doc" ' -S T1 -D T2

# ibrix_migrator -A -f ifs2 -r ' name = "*.jpg" ' -S T2 -D T1

For example, if tier 1 is filled with .doc files to 70% capacity and tier2 is filled with .jpg files to

80% capacity, then tiering might terminate before it is able to fully "swap" the contents of tier 1

and tier 2. The files are processed in no particular order; therefore, it is possible that more .doc

files will be encountered at the beginning of the job, causing space on tier 2 to be consumed faster

than on tier 1. Once a destination tier is full, obviously no further movement in that direction is

possible.

These rules in these two examples are ambiguous because they give rise to possible conflicting

file movement. It is the user’s responsibility to write unambiguous rules for the data tiering policy

for their file systems.

Writing tiering rules 115

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HP X9320 Manual do Utilizador Página 115