When adding a new hard disk to a running VM, do I still need to scan for new SCSI devices?

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End Goal



To automate the addition/extension/formatting of a new disk onto a running Linux host using vSphere and Ansible.



Dilemma



I'm not a huge fan of writing such automation when I don't fully understand the commands and what they're doing.



My current knowledge of adding a new disk on a running Linux VM requires a scan/rescan of the SCSI devices. However, I can't seem to find information (may be my google-fu running low today) on why I need to run the following commands when on a system where I've not run them I can run lsblk and see the new disk already there.



Find Host Bus Number



grep mpt /sys/class/scsi_host/host?/proc_name



Force a SCSI scan



echo "- - -" > /sys/class/scsi_host/host0/scan



Question



Is the scanning portion of this process still needed?



System I was just working on was running kernel 3.10.0. When new disks are added they are added as SCSI disks.



Let me know if I need to clarify anything.






vmware disk ansible scsi lsblk






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  • Do you have VMWare tools (or openvmtools) installed & running?
    – Jeff Schaller
    4 mins ago














up vote
0
down vote

favorite












End Goal



To automate the addition/extension/formatting of a new disk onto a running Linux host using vSphere and Ansible.



Dilemma



I'm not a huge fan of writing such automation when I don't fully understand the commands and what they're doing.



My current knowledge of adding a new disk on a running Linux VM requires a scan/rescan of the SCSI devices. However, I can't seem to find information (may be my google-fu running low today) on why I need to run the following commands when on a system where I've not run them I can run lsblk and see the new disk already there.



Find Host Bus Number



grep mpt /sys/class/scsi_host/host?/proc_name



Force a SCSI scan



echo "- - -" > /sys/class/scsi_host/host0/scan



Question



Is the scanning portion of this process still needed?



System I was just working on was running kernel 3.10.0. When new disks are added they are added as SCSI disks.



Let me know if I need to clarify anything.






vmware disk ansible scsi lsblk






share























  • Do you have VMWare tools (or openvmtools) installed & running?
    – Jeff Schaller
    4 mins ago












up vote
0
down vote

favorite









up vote
0
down vote

favorite











End Goal



To automate the addition/extension/formatting of a new disk onto a running Linux host using vSphere and Ansible.



Dilemma



I'm not a huge fan of writing such automation when I don't fully understand the commands and what they're doing.



My current knowledge of adding a new disk on a running Linux VM requires a scan/rescan of the SCSI devices. However, I can't seem to find information (may be my google-fu running low today) on why I need to run the following commands when on a system where I've not run them I can run lsblk and see the new disk already there.



Find Host Bus Number



grep mpt /sys/class/scsi_host/host?/proc_name



Force a SCSI scan



echo "- - -" > /sys/class/scsi_host/host0/scan



Question



Is the scanning portion of this process still needed?



System I was just working on was running kernel 3.10.0. When new disks are added they are added as SCSI disks.



Let me know if I need to clarify anything.






vmware disk ansible scsi lsblk






share















End Goal



To automate the addition/extension/formatting of a new disk onto a running Linux host using vSphere and Ansible.



Dilemma



I'm not a huge fan of writing such automation when I don't fully understand the commands and what they're doing.



My current knowledge of adding a new disk on a running Linux VM requires a scan/rescan of the SCSI devices. However, I can't seem to find information (may be my google-fu running low today) on why I need to run the following commands when on a system where I've not run them I can run lsblk and see the new disk already there.



Find Host Bus Number



grep mpt /sys/class/scsi_host/host?/proc_name



Force a SCSI scan



echo "- - -" > /sys/class/scsi_host/host0/scan



Question



Is the scanning portion of this process still needed?



System I was just working on was running kernel 3.10.0. When new disks are added they are added as SCSI disks.



Let me know if I need to clarify anything.






vmware disk ansible scsi lsblk




vmware disk ansible scsi lsblk





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edited 4 mins ago









Jeff Schaller

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asked 9 mins ago









Odinson

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  • Do you have VMWare tools (or openvmtools) installed & running?
    – Jeff Schaller
    4 mins ago
















  • Do you have VMWare tools (or openvmtools) installed & running?
    – Jeff Schaller
    4 mins ago















Do you have VMWare tools (or openvmtools) installed & running?
– Jeff Schaller
4 mins ago




Do you have VMWare tools (or openvmtools) installed & running?
– Jeff Schaller
4 mins ago















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