[单选]

Company.com with a newly installed cluster has been checking the logfiles to determine if the  cluster has had any recent activity. The non-IP RS232 heartbeat connection seems to be having a difficulty. The serial network goes down，and then a couple of minutes later comes back up again. This pattern is repeated many times in the log. 
If this system was installed without regard to best practices， what is the most likely problem with the serial network？（）  

Companycom has several AS/400 servers in their IT infrastructure running V5R2 that they wish to  consolidate. The customer wants to simplify their environment and install i5/OS on a p5 590 with 16  1.65GHz processors and 20 i5/OS partitions. The customer plans to use the Advanced Power Virtualization to share their storage, processors, and memory. What considerations and limitations should be reviewed with the customer before the purchase?（） Resources cannot be shared with an i5 partition when it is put on a pSeries. The i5 partition needs its own 9411-100 tower because of IOP. V5R3 OS or later is required. There is a maximum of two partitions in a 590.。 Resources cannot be shared between partitions when i5/OS is put on a pSeries. The i5 partition needs its own 9411-100 tower because of IOP. i5/OS can be at V5R2 or a V5R3. Currently only one i5 partition is allowed. 。 V5R3 is required for the i5 partitions. Virtual IO Server is not supported for the i5/OS partitions to share storage. Up to 10 i5 partitions per processor are allowed (a maximum of two processors for up to 20 partitions). 。 Processor and memory resources can be shared between AIX 5L, Linux and i5/os partitions. i5/OS needs to be at V5R3, and Virtual IO Server is not supported for the i5/OS partition to share storage. On a 1.65 GHz POWER5 p5 590 there is a maximum of one partition.。 段级修程中，总风管系的漏泄量不得超过（）。 10kPa。 20kPa。 30kPa。 40kPa。 A System p administrator would like to verify the user definitions in the /etc/passwd file.  Which of the following commands will accomplish this（） sysck。 usrck。 lssec。 lsuser。 下列情形中，应以故意杀人罪定罪判刑的有（）。 非法拘禁。 司法工作人员刑讯逼供。 司法工作人员暴力取证。 监管人员虐待被监管人。 贾德所做的著名的水下击靶实验证明的是（） 智力技能中规则的迁移。 陈述性知识的迁移。 动作技能的迁移。 认知策略的迁移。

Company.com with a newly installed cluster has been checking the logfiles to determine if the  cluster has had any recent activity. The non-IP RS232 heartbeat connection seems to be having a difficulty. The serial network goes down，and then a couple of minutes later comes back up again. This pattern is repeated many times in the log. 
If this system was installed without regard to best practices， what is the most likely problem with the serial network？（）