[CentOS] getting a CentOS6 VM on VMware ESXi platform to recognize a new disk device

[Boris Epstein]

>>
> vmware esxi 5.5.0 (free, using vsphere client to manage), vm is minimal
> centos 7 64bit.   I added a 16gb vdisk and immediately see this in dmesg...
>
> [155484.386792] vmw_pvscsi: msg type: 0x0 - MSG RING: 1/0 (5)
> [155484.386796] vmw_pvscsi: msg: device added at scsi0:1:0
> [155484.388250] scsi 0:0:1:0: Direct-Access     VMware   Virtual disk
>  1.0  PQ: 0 ANSI: 2
> [155484.391275] sd 0:0:1:0: [sdb] 33554432 512-byte logical blocks: (17.1
> GB/16.0 GiB)
> [155484.391552] sd 0:0:1:0: [sdb] Write Protect is off
> [155484.391556] sd 0:0:1:0: [sdb] Mode Sense: 61 00 00 00
> [155484.391593] sd 0:0:1:0: [sdb] Cache data unavailable
> [155484.391595] sd 0:0:1:0: [sdb] Assuming drive cache: write through
> [155484.396148]  sdb: unknown partition table
> [155484.396356] sd 0:0:1:0: [sdb] Attached SCSI disk
>
> and lsblk shows...
>
> # lsblk
> NAME                      MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
> sda                         8:0    0   32G  0 disk
> ....
> sdb                         8:16   0   16G  0 disk
> ...
>
> so I can immediately...
>
> # mkfs.xfs /dev/sdb
> meta-data=/dev/sdb               isize=256    agcount=4, agsize=1048576
> blks
> .....
> # mount /dev/sdb /mnt
> #
>
> (normally, I'd partition and lvm it, this is just for demo)
> I'm using a paravirtual scsi controller, and have previously installed
> open-vm-tools via yum.
>
> I then umounted it, and in vsphere deleted the vdisk and dmesg immediately
> shows...
>
> [155820.730477] vmw_pvscsi: msg type: 0x1 - MSG RING: 2/1 (5)
> [155820.730481] vmw_pvscsi: msg: device removed at scsi0:1:0
> [155820.754176] sd 0:0:0:0: Attached scsi generic sg0 type 0
> [155820.754247] sr 2:0:0:0: Attached scsi generic sg1 type 5
>
>
> I also did much the same with a CentOS 6.7 VM, also using a 'paravirtual
> SCSI' vm on the same esxi host, when I added the vdisk, it immediately
> shows...
>
> # dmesg
> .....
> vmw_pvscsi: msg type: 0x0 - MSG RING: 1/0 (5)
> vmw_pvscsi: msg: device added at scsi0:1:0
> scsi 2:0:1:0: Direct-Access     VMware   Virtual disk     1.0  PQ: 0 ANSI:
> 2
> sd 2:0:1:0: Attached scsi generic sg2 type 0
> sd 2:0:1:0: [sdb] 33554432 512-byte logical blocks: (17.1 GB/16.0 GiB)
> sd 2:0:1:0: [sdb] Write Protect is off
> sd 2:0:1:0: [sdb] Mode Sense: 61 00 00 00
> sd 2:0:1:0: [sdb] Cache data unavailable
> sd 2:0:1:0: [sdb] Assuming drive cache: write through
> sd 2:0:1:0: [sdb] Cache data unavailable
> sd 2:0:1:0: [sdb] Assuming drive cache: write through
>  sdb: unknown partition table
> sd 2:0:1:0: [sdb] Cache data unavailable
> sd 2:0:1:0: [sdb] Assuming drive cache: write through
> sd 2:0:1:0: [sdb] Attached SCSI disk
>
> # lsblk
> NAME                               MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
> sr0                                 11:0    1 1024M  0 rom
> sda                                  8:0    0   16G  0 disk
> ├─sda1                               8:1    0  500M  0 part /boot
> └─sda2                               8:2    0 15.5G  0 part
>   ├─vg_svfisc6test5-lv_root (dm-0) 253:0    0  9.6G  0 lvm  /
>   └─vg_svfisc6test5-lv_swap (dm-1) 253:1    0  5.9G  0 lvm  [SWAP]
> sdb                                  8:16   0   16G  0 disk
>
> and I note this VM is *not* running vmware tools
>
> NEITHER of these two VMs required rebooting or any echo "- - -"
> >/sys/scsi/.. stuffs.
>
>
> --
> john r pierce, recycling bits in santa cruz
>
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
>


John,

Thanks for your input.

I don't get this for some reason... not even sure why. ESXi's default
behaviour seems to be to allow hotplug, that does not seem to be
deactivated. I am just not sure. Wonder if this could be the Centos 7 vs 6
- perhaps that is what I ought to test for.

Boris.