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CONTAP-476238: WAFL hang due to backgroud IO statistics consuming too much memory

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ontap-9
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CORE
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Issue

The ONTAP 9.9.1 kernel does not have the check to limit background IOs (BigIOs) statistics object creation that collects stats information for Reconstructing operation. This can end up consuming a significant amount of system memory as many stats objects are getting created so, other operation cannot find enough resources to move forward. This can cause WAFL hang.

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