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poor disk performance however no sign of failure

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http://www.unix.com – Hello guys, I have two servers performing the same disk operations. I believe one server is having a disk's impending failure however I have no hard evidence to prove it. This is a pair of Netra 210's with 2 drives in a hardware raid mirror (LSI raid controller). While performing intensive reads and writes, the system gets backed up with data that previously it was able to handle without issue. Raidctl -l shows the array is still in optimal condition however iostat shows the wsvc_t and asvc_t being much more excessive in comparision on the server with the potential problem. iostat - (HowTos)