HP dl180 g9 - raid5 hot spare disk

A friend got a new server with 8 HDDs, he created a raid5+1 hot spare. and installed the os. after that he wanted to test whether the hot spare would would and he pulled a disk from raid5. successfully the hot spare was added to the raid5 and rebuilt the raid5.

Now the question is that the HDD he earlier pulled; he wants to put it back and use as the new hot spare. since there is some data in this HDD since it was participating in the raid5 earlier, will this work as hot spare? or else will he have to format this disk? if so, how to format? from ACU?
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lapatiyaAsked:
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MAS (MVE)EE Solution GuideCommented:
-->are you sure that in a future failure the hot spare disk (with exiting data) be erased before joined to the raid5 again?
Yes. But you have to make sure it is added as hotspare and healthy.
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MAS (MVE)EE Solution GuideCommented:
You have to ADD this HDD as a hotspare from ACU.
Format will be done by the system.

Some/rare cases pulled out HDD will become faulty if pulled while working.
But you can try adding again as hotspare.
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lapatiyaAuthor Commented:
My stupid friend pulled it while working from this brand new, just-installed server. so hope the HDD in brand new condition with some data on it. so are you sure that if he add this disk again to the server and edit the existing raid5 to have this as hot spare and it will work?

are you seure that in a future failure the hot spare disk (with exiting data) be erased before joined to the raid5 again?
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lapatiyaAuthor Commented:
got it! thanks
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lapatiyaAuthor Commented:
Thanks for the confirmation
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MAS (MVE)EE Solution GuideCommented:
Do not forget to check the health of the HDD added.
If it is not healthy it will not function as hotspare.
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