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Bug #2542
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dmu_prefetch: zfs_prefetch_disable should not disable metaslab_prefetch
Status:
New
Priority:
Normal
Assignee:
-
Category:
zfs - Zettabyte File System
Start date:
2012-03-26
Due date:
% Done:
0%
Estimated time:
Difficulty:
Medium
Tags:
needs-triage
Gerrit CR:
Description
activate zfs_prefetch_disable disable all dmu_prefetch.
For metaslab_prefetch is a very bad idea:
When zfs decide to use a new metaslab, it's not loaded.
With 2To Hard Drive and a lot of spacemap entries, activate a new metaslab can take so long time (more than ten of seconds for my case) and hang IO.
I propose a patch for this issue.
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