We used ECKD devices because they were readily available whereas an FCP SCSI environment was not.
之所以使用ECKD设备，是因为它们可以立即使用，而FCP SCSI环境则不能。
Eventually, we determined that the I/O issue was caused by the way the ECKD volumes were being supported in Linux and how requests were being queued at the logical device level.
最终，我们确定，I/O 问题是由 Linux 支持 ECKD 卷的方式和逻辑设备级别上请求的排队方式引起的。
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