[AIX]a simple question from redbook

gototop

4. The finance group at the Widget Company has just approved a new financial\r\npackage that runs on an RS/6000. They will be converting their old data to the\r\nnew system. Currently, they have 10 GB of data but will be growing to 18 GB\r\nwith the new system because they want to maintain one year of history online.\r\nThe new system they have ordered is an F50 with 128 MB of RAM, an SSA\r\ncard, two 9.1 GB SSA drives, and a single FDDI card.\r\nWhat would be the best addition to this system for redundancy?\r\n1. One SSA card\r\n2. Two 9.1 GB SSA disks\r\n3. Error correcting RAM\r\n4. Two additional processors\r\nA. 3 and 1\r\nB. 4 and 1\r\nC. 4 and 2\r\nD. 1 and 2\r\n\r\nWhich is correct answer and what is mean about \"SSA\" ?\r\nTKS in advance !

zsh_365

很明显需要更多的硬盘和硬盘接口卡（ssa卡）

dugong

I think you ought to choose C ,but I don\'t know why it is always 1 in the three  answer,you only need one SSA card .so I choose C .\r\nSSA is Serial  System Array,disk interface card ,it often link disk array ,like IBM D40.

zsh_365

I choose D,为了冗余（edundancy），数据有18G，原来的硬盘只有18G。ssa不一定非要结磁盘阵列，也可以结磁盘。

gototop

我真的不到选什么：）

chao_ping

选择D。\r\n题目是问你为了冗余。\r\n多加CPU，不能保证冗余。\r\n硬盘和SSA都是单点故障的。