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We have an IBM x226 server with Windows 2003 running on it. For weeks it's been very slow and it freezes at least once each day. At the boot it show message "degraded" for one HDD and optimal for other HDDs. We have 4 HDDs in it set up in Raid 1. HDD 1 -> HDD 2, HDD 3 -> HDD4.

It seems that HDD2 is the one who is causing problems (showing degraded status). There's an amber led blinking on it together with the green one. We installed ServerRAID manager downloaded from IBM and it gave us option for "rebuild". But the server froze at some point and now it's rebuilding from start again.

I've done some Googling and it says that it could be to failing HDD or some cache battery. How can we verify what is the cause of this?

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Sorry for asking, but you did not mention: You changed the defective hdd2, don't you? Because it is broken, you risk to loose your data, if you continue to force rebuild on a broken hdd! You need a new good hdd with the same size/type or at least a bigger one. – user139915 Oct 6 '12 at 12:47

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