linux（Redhat,suse）系统如何在线扫描新增磁盘阵列?

jxguiyang001

Redhat 5.4新挂接了一台IBM DS4800存储分区，单根光纤连接，
存储端映射完以后主机端fdisk -l无法发现新设备，在线应用系统，不能重启，不能影响业务应用。
求方法，拜谢！

jxguiyang001

类似AIX系统中cfgmgr命令，求解！

zjfdamo

这个以前我没遇到过~~~~~~

jxguiyang001

安装sg3_utils ，是一个Linux的开发包，用来直接使用 SCSI 命令集访问设备
sg3_utils-1.25-4.el5.x86_64
sg3_utils-devel-1.25-4.el5.i386
sg3_utils-devel-1.25-4.el5.x86_64
sg3_utils-libs-1.25-4.el5.i386
sg3_utils-libs-1.25-4.el5.x86_64
执行scsi_rescan命令扫描  /usr/bin/scsi-rescan

实际上也是调用下面命令：
echo "1" > /sys/class/fc_host/host/issue_lip

                    这个命令会产生一个LIP操作(Loop Initialization Protocol)
                    echo "- - -" > /sys/class/scsi_host/hosth/scan
                   这个命令会扫描SCSI总线。注意要把hosth换成正确的hosts.

cu_little_bird

rescan-scsi-bus.sh

milujite

1. Issue
   
2.         * How to remove or add scsi devices online?
   
3.         * Added Three Additional SCSI Devices to System - OS Doesn't Recognize
   
4. 
   
5. Environment
   
6.         * Red Hat Enterprise Linux 5 update 4
   
7. 
   
8. Resolution1. Add new SCSI disk on the server.
   
9. 2. Run the command below as root:
   
10. # echo "scsi add-single-device x y z u" > /proc/scsi/scsi
    
11. 
    
12. x : The HOST of SCSI controller which controls the disk ("N" of scsiN)
    
13. y : SCSI Channel of disk (the value is 0 when it's a single channel; If there are multi-channels, the value is determined by which channel the disk belongs to)
    
14. z : SCSI ID of the disk (the value can be determined by which socket the disk pludged in)
    
15. u : LUN ID of the disk (the value is 0 by default)
    
16. 
    
17. If the values of "x", "y", "z" are not right, the system can not add the disk successfully.
    
18. Check the file /proc/scsi/scsi and determine whether the disk can be added successfully. If added successfully, the content of file /proc/scsi/scsi may contain the information of the new disk. The file /proc/scsi/scsi contains the information of every device which system can recognize. The information includes vendor, model type, media type and so on.
    
19. 
    
20. For example, I add the third disk in my server, and run the command below:
    
21. # echo "scsi add-single-device 0 0 2 0" > /proc/scsi/scsi
    
22. 
    
23. Then check the file /proc/partition, the new disk is recognized. And you can make partitions, format, and use it normally.
    
24. 
    
25. If you want remove a disk online, take the steps below:
    
26. 1. Run the command below:
    
27. # echo "scsi remove-single-device x y z u" > /proc/scsi/scsi
    
28. The meanings of "x", "y", "z" and "u" are the same as mentioned above.
    
29. 
    
30. 2. Remove the disk physically.
    
31. 
    
32. For example, I have a SCSI disk and a SCSI CD-ROM which are both on the motherboard. After booting my computer, the contents of file /proc/scsi/scsi are as follows by default:
    
33. # cat /proc/scsi/scsi
    
34. Attached devices:Host: scsi2 Channel: 00 Id: 00 Lun: 00  Vendor: ATA      Model: Hitachi HTS54168 Rev: SB2O  Type:   Direct-Access                    ANSI  SCSI revision: 05Host: scsi0 Channel: 00 Id: 00 Lun: 00  Vendor: HL-DT-ST Model: CDRW/DVD GCCT10N Rev: A100  Type:   CD-ROM                           ANSI  SCSI revision: 05
    
35. 
    
36. Then I try to remove SCSI CD-ROM:
    
37. # echo "scsi remove-single-device 0 0 0 0" > /proc/scsi/scsi
    
38. Check the file /proc/scsi/scsi again, notice only SCSI disk remained.
    
39. 
    
40. Then add the SCSI CD-ROM back again:
    
41. # echo "scsi add-single-device 0 0 0 0" > /proc/scsi/scsi
    
42. 
    
43. Then I try to remove the only SCSI disk of my computer, as expectation, the system is kernel panic.
    
44. # echo "scsi remove-single-device 2 0 0 0" > /proc/scsi/scsi
    
45. 
    
46. After rebooting, everything is all right.
    

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参考这个吧，成功在RHEL上在线识别EVA 4400。其他存储也一样，要求比较高点，要知道SCSI的各个ID。