https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228359
Bug ID: 228359
Summary: rebuild gmirror + ufs + ssd +trim
Product: Base System
Version: 11.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Assume the situation.
Have gmirror with 2 ssd components (ada0, ada1). UFS over gmirror.
One component (e.g., ada1) becomes broken and should be replaced.
gmirror forget gm0
replace broken drive with new one
gmirror insert gm0 ada1
gmirror rebuid gm0 ada1 (if autosync was disabled)
Wait some time until synchronization done.
Now what we have?
ada0 fine, but ada1 is fully dd'ed. From drive side ada1 is fully written.
Now we start write large volume of data to fs, and see (systat -vmstat) that
ada1 performs poorly (low write speed, high busy percentage).
When we remove large file from fs, TRIM is sent to ada1 and it begin perform
better (on new big write, hight write speed, less busy percentage).
Now the question.
Is there a way to send TRIM commands to ada1 after rebuild according UFS state
to allow drive know what "regions" should be considered as currently unused?
The way I found: is to create a large file and to delete it, but it is not
good, because of low overall performance during creation of a file.
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