t.Fatalf("%s : %s", instanceType, err.Error())
	}

	z := obj.(*erasureServerPools)
	er := z.serverPools[0].sets[0]

	erasureDisks := er.getDisks()
	ridx := rand.Intn(len(erasureDisks))

	z.serverPools[0].erasureDisksMu.Lock()
	er.getDisks = func() []StorageAPI {
		erasureDisks[ridx] = newNaughtyDisk(erasureDisks[ridx], nil, errFaultyDisk)
		return erasureDisks
	}

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	er := s.getHashedSet(object)
	return er.PutObjectMetadata(ctx, bucket, object, opts)
}

// DecomTieredObject - moves tiered object to another pool during decommissioning.
func (s *erasureSets) DecomTieredObject(ctx context.Context, bucket, object string, fi FileInfo, opts ObjectOptions) error {
	er := s.getHashedSet(object)
	return er.DecomTieredObject(ctx, bucket, object, fi, opts)
}