免费注册 查看新帖 |

Chinaunix

  平台 论坛 博客 文库
最近访问板块 发新帖
查看: 3275 | 回复: 4

关于solaris下面的CnTnDnSn里面的Tn和Dn [复制链接]

论坛徽章:
0
发表于 2002-06-07 15:12 |显示全部楼层
一直没有搞清楚,这个Tn究竟代表什么含义.
Tn和Dn有什么区别.
好像看介绍都是Target ID,一般一个SCSI卡上面,一个Scsi ID只能连接一个硬盘吧? 干吗还有Tn和Dn的区别呢?

论坛徽章:
0
发表于 2002-06-07 18:11 |显示全部楼层

关于solaris下面的CnTnDnSn里面的Tn和Dn

Cn means controller No.
Tn means target No. You can attach 7  SCSI devices with target 0-6 (target 7 is for controller itself, though it can be changed) to one single channel SCSI controller adapter and 15 SCSI devices with target 0-6 and 8-15 to dual channel SCSI controller adapter. For Multipak, D1000, A5X00 Disk array the target No of a hard disk depends on the slot no it is located.
Dn called LUN(Logical Unit No). It is always zero for no hardware-RAID devices. However for Hardware RAID disk array A1000, A3X00, T3, the Lun of the hard driver you see from OS may not be zero.

Hope this may help.

论坛徽章:
0
发表于 2002-06-07 19:11 |显示全部楼层
thanks.
This means for general scsi disks, the Tn means it is the nth disk in this scsi card
while for hardware-based raid , from the os view, the logical disk(made up of several disks) is expressed with the combination of Tn and Dn.
Is it right.
Thanks.

论坛徽章:
0
发表于 2002-06-08 00:57 |显示全部楼层

This means for general scsi disks, the Tn means it is the nth disk in this scsi

Not exactly.

For example, the Sun StorEdge MultiPack storage system has two sets of pre-selected SCSI IDs. The user can choose to use IDs 1, 2, 3, 4, 5, and 6 or IDs 9, 10, 11, 12, 13, and 14. A switch allows customers to select IDs 1—6 or IDs 9—14, allowing daisy-chaining of Sun StorEdge MultiPack systems on a fast/wide SCSI bus.

When you daisy chain the external SCSI devices to SCSI adapter, vendor usually has jupmer on the back of the device you can pick target ID you want just to make sure it will not conflict with other device. Of course you usually set the target ID of tape device to 6 so it gets higher priority.

Hope this answers your question.

论坛徽章:
0
发表于 2002-06-08 14:18 |显示全部楼层
最初由 chao_ping 发布
[B]thanks.
This means for general scsi disks, the Tn means it is the nth disk in this scsi card
while for hardware-based raid , from the os view, the logical disk(made up of several disks) is expressed with the combination of Tn and Dn.
Is it right.
Thanks. [/B]


what\'s important is not the order of disks in a daisy-chain, but the scsi id set on each disk.  kind of like the idea of an ip address on an ethernet lan.

btw, clu65\'s explaination is very clear.
您需要登录后才可以回帖 登录 | 注册

本版积分规则 发表回复

  

北京盛拓优讯信息技术有限公司. 版权所有 京ICP备16024965号-6 北京市公安局海淀分局网监中心备案编号:11010802020122 niuxiaotong@pcpop.com 17352615567
未成年举报专区
中国互联网协会会员  联系我们:huangweiwei@itpub.net
感谢所有关心和支持过ChinaUnix的朋友们 转载本站内容请注明原作者名及出处

清除 Cookies - ChinaUnix - Archiver - WAP - TOP