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ibre5041
ibre5041
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Some rumors on Internet say that bootable device is always on SCSI host0, but is does not seemsseem to be true anymore.

Some rumors on Internet say that bootable device is always on SCSI host0, but is does not seems to be true anymore.

Some rumors on Internet say that bootable device is always on SCSI host0, but is does not seem to be true anymore.

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ibre5041
ibre5041
  • 141
  • 4

SCSI Host number persitence

I have two identical VM servers in VMware. I want to somehow distinguish assigned disk to these VMs (disks for LVM, for DB data, ...). But for some reason H:C:T:L addresses on these hosts differ.

[root@rhel7-rac-a-node-1]# lsscsi
[1:0:0:0]    disk    VMware   Virtual disk     2.0   /dev/sda
[1:0:1:0]    disk    VMware   Virtual disk     2.0   /dev/sdb
[3:0:0:0]    disk    VMware   Virtual disk     2.0   /dev/sdc
[3:0:1:0]    disk    VMware   Virtual disk     2.0   /dev/sdd
[3:0:2:0]    disk    VMware   Virtual disk     2.0   /dev/sde

[root@rhel7-rac-a-node-2]# lsscsi
[0:0:0:0]    disk    VMware   Virtual disk     2.0   /dev/sda
[0:0:1:0]    disk    VMware   Virtual disk     2.0   /dev/sdb
[1:0:0:0]    disk    VMware   Virtual disk     2.0   /dev/sdc
[1:0:1:0]    disk    VMware   Virtual disk     2.0   /dev/sdd
[1:0:2:0]    disk    VMware   Virtual disk     2.0   /dev/sde

Output from dmesg shows that on 1st server driver ata_piix was loaded before vmw_pvscsi. While on 2nd server it was vice-versa.

[root@rhel7-rac-a-node-1]# dmesg | grep -i -e libata -e pvscsi -e ata_piix
[    1.230391] libata version 3.00 loaded.
[    1.233959] ata_piix 0000:00:07.1: version 2.13
[    1.241146] VMware PVSCSI driver - version 1.0.7.0-k
[    1.254060] scsi host0: ata_piix
[    1.262946] scsi host1: VMware PVSCSI storage adapter rev 2, req/cmp/msg rings: 8/8/1 pages, cmd_per_lun=254
[    1.268604] scsi host2: ata_piix
[    1.285826] scsi host3: VMware PVSCSI storage adapter rev 2, req/cmp/msg rings: 8/8/1 pages, cmd_per_lun=254

[root@rhel7-rac-a-node-2]# dmesg | grep -i -e libata -e pvscsi -e ata_piix
[    1.120313] VMware PVSCSI driver - version 1.0.7.0-k
[    1.149768] scsi host0: VMware PVSCSI storage adapter rev 2, req/cmp/msg rings: 8/8/1 pages, cmd_per_lun=254
[    1.174869] scsi host1: VMware PVSCSI storage adapter rev 2, req/cmp/msg rings: 8/8/1 pages, cmd_per_lun=254
[    1.177702] libata version 3.00 loaded.
[    1.180621] ata_piix 0000:00:07.1: version 2.13
[    1.192439] scsi host2: ata_piix
[    1.199541] scsi host3: ata_piix
[ 2392.846873] ata_piix 0000:00:07.1: version 2.13
[ 2392.847207] scsi host5: ata_piix
[ 2392.847266] scsi host6: ata_piix

Some rumors on Internet say that bootable device is always on SCSI host0, but is does not seems to be true anymore.