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SubjectWhy does the md/raid subsystem does not remap bad sectors in a raid array?
I asked before but it was kind of clobbered in the velociraptor mess:

On a colleague's box:

Aug 02, 2008 12:15.30AM(0x04:0x0023): Sector repair completed: port=7,

SMART Self-test log structure revision number 0
Warning: ATA Specification requires self-test log structure revision
number = 1
Num Test_Description Status Remaining
LifeTime(hours) LBA_of_first_error
# 1 Extended offline Completed: read failure 90% 305

Even though this disk has a bad sector:
198 Offline_Uncorrectable 0x0030 100 100 000 Old_age Offline
- 1

The controller does not drop the drive from the array when it hits an
error, the 3ware card "takes care of it" and the user need not worry about
it, whereas with md/raid every time it hits a bad sector, it breaks the
raid and it goes degraded, is this correct? Will/can something like what
3ware does be possible in a sw-raid based configuration or is a HW raid
card required?


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