Linux在线扫描热添加的SCSI/iSCSI设备

SCSI接口具有应用范围广、多任务、带宽大、CPU占用率低，以及热插拔等优点，在服务器中广泛的应用。

当然在虚拟化平台支持下，也能模拟出SCSI设备，方便在虚拟机上热添加SCSI设备（一般是硬盘）

但是在热添加SCSI设备之后，需要手动rescan SCSI设备。

比较常见的做法是输入如下命令

echo "- - -" > /sys/class/scsi_host/host*/scan

CentOS/RHEL5.9开始（SUSE11/12也有这个工具）提供一个工具包sg3_utils同样可以方便的实现rescan操作

# yum install sg3_utils # /usr/bin/rescan-scsi-bus.sh
即可rescan SCSI设备

以下是rescan-scsi-bus.sh的说明

# /usr/bin/rescan-scsi-bus.sh --help Usage: rescan-scsi-bus.sh [options] [host [host ...]] Options:-a scan all targets, not just currently existing [default: disabled]-d enable debug [default: 0]-l activates scanning for LUNs 0--7 [default: 0]-L NUM activates scanning for LUNs 0--NUM [default: 0]-w scan for target device IDs 0--15 [default: 0--7]-c enables scanning of channels 0 1 [default: 0 / all detected ones]-m update multipath devices [default: disabled]-r enables removing of devices [default: disabled]-f flush failed multipath devices [default: disabled]-i issue a FibreChannel LIP reset [default: disabled]-u look for existing disks that have been remapped-s look for resized disks and reload associated multipath devices, if applicable --alltargets: same as -a --remove: same as -r --flush: same as -f --issue-lip: same as -i --wide: same as -w --multipath: same as -m --forceremove: Remove stale devices (DANGEROUS) --forcerescan: Remove and readd existing devices (DANGEROUS) --nooptscan: don't stop looking for LUNs if 0 is not found --color: use coloured prefixes OLD/NEW/DEL --hosts=LIST: Scan only host(s) in LIST --channels=LIST: Scan only channel(s) in LIST --ids=LIST: Scan only target ID(s) in LIST --luns=LIST: Scan only lun(s) in LIST --sync/nosync: Issue a sync / no sync [default: sync if remove] --attachpq3: Tell kernel to attach sg to LUN 0 that reports PQ=3 --reportlun2: Tell kernel to try REPORT_LUN even on SCSI2 devices --largelun: Tell kernel to support LUNs > 7 even on SCSI2 devs --sparselun: Tell kernel to support sparse LUN numbering --update: same as -u --resize: same as -sHost numbers may thus be specified either directly on cmd line (deprecated) oror with the --hosts=LIST parameter (recommended). LIST: A[-B][,C[-D]]... is a comma separated list of single values and ranges(No spaces allowed.)

本文参考链接如下

How do I rescan an HP Smart Array for new devices without rebooting?

How to rescan the SCSI bus to add or remove a SCSI device without rebooting the computer

ADDING/REMOVING A LOGICAL UNIT THROUGH RESCAN-SCSI-BUS.SH

HOWTO: Add, Resize and Remove LUN without restarting SLES or OES Linux

转载于:https://www.cnblogs.com/luanlengli/p/8849154.html

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