The server is detecting only a few scsi devices out of many at system boot (because of scsi version 2 devices)
Issue
- We are not able to detect all the scsi devices even on the booted system unless we are manually rescanning it with
rescan-scsi-bus.sh
- System cannot mount one of the filesystems at boot time due to this
- System only scans two SCSI devices out of eight total at boot time
- During the boot process, 1 of the 9 SAN LUNs is not visible resulting in the system going into maintenance mode
- There are 50 luns assigned to this server and was working good. Currently there are only 8 luns showing in the server.
Environment
- Red Hat Enterprise Linux 7 (encountered at least in 7.3, 7.4 and 7.6, but it is expected to affect all releases)
- Storage devices conforming to scsi version 2
- Commonly encountered with HITACHI, OPEN-V storage arrays and LUNs configured for solaris instead of linux (frequently reporting the vendor,model: HITACHI ,OPEN-V -SUN).
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.