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Too many scsi hosts in /sys/class/scsi_host. Only one SCSI controller is used, other two are not used

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I have 8 disks in my virtual bastion server whose PCI address is also shared here along with the host ID which controls them. However lspci lists three drive controllers. Does it mean that the other two are not used at all and only SCSI Controller: LSI Logic is used here. Why host0 and other hosts are there if only host2 is used.

[root@linux_server ~]# fdisk -l | grep -i disk |grep -v identifer | grep -v identifier | grep -v mapper

Disk /dev/sda: 46.2 GB, 46170898432 bytes Disk /dev/sdb: 8589 MB, 8589934592 bytes Disk /dev/sdd: 21.5 GB, 21474836480 bytes Disk /dev/sde: 53.7 GB, 53687091200 bytes Disk /dev/sdc: 10.7 GB, 10737418240 bytes Disk /dev/sdf: 8589 MB, 8589934592 bytes Disk /dev/sdg: 2147 MB, 2147483648 bytes Disk /dev/sdh: 2147 MB, 2147483648 bytes

[root@linux_server ~]# ls -l /sys/block/sd*

lrwxrwxrwx 1 root root 0 Sep 2 06:39 /sys/block/sda -> ../devices/pci0000:00/0000:00:10.0/host2/target2:0:0/2:0:0:0/block/sda lrwxrwxrwx 1 root root 0 Sep 2 06:39 /sys/block/sdb -> ../devices/pci0000:00/0000:00:10.0/host2/target2:0:1/2:0:1:0/block/sdb lrwxrwxrwx 1 root root 0 Sep 2 06:39 /sys/block/sdc -> ../devices/pci0000:00/0000:00:10.0/host2/target2:0:2/2:0:2:0/block/sdc lrwxrwxrwx 1 root root 0 Sep 2 06:39 /sys/block/sdd -> ../devices/pci0000:00/0000:00:10.0/host2/target2:0:3/2:0:3:0/block/sdd lrwxrwxrwx 1 root root 0 Sep 2 06:39 /sys/block/sde -> ../devices/pci0000:00/0000:00:10.0/host2/target2:0:4/2:0:4:0/block/sde lrwxrwxrwx 1 root root 0 Sep 2 06:39 /sys/block/sdf -> ../devices/pci0000:00/0000:00:10.0/host2/target2:0:5/2:0:5:0/block/sdf lrwxrwxrwx 1 root root 0 Sep 2 06:39 /sys/block/sdg -> ../devices/pci0000:00/0000:00:10.0/host2/target2:0:6/2:0:6:0/block/sdg lrwxrwxrwx 1 root root 0 Sep 2 06:39 /sys/block/sdh -> ../devices/pci0000:00/0000:00:10.0/host2/target2:0:8/2:0:8:0/block/sdh

[root@linux_server ~]# lspci | egrep -i "sata|scsi|ide"

00:07.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01) 00:10.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 01) 02:04.0 SATA controller: VMware SATA AHCI controller

[root@linux_server ~]# cat /sys/class/scsi_host/host*/proc_name | wc -l

33

[root@linux_server ~]# ls -l /sys/class/scsi_host/host*

lrwxrwxrwx 1 root root 0 Sep 2 06:24 /sys/class/scsi_host/host0 -> ../../devices/pci0000:00/0000:00:07.1/host0/scsi_host/host0 lrwxrwxrwx 1 root root 0 Sep 2 06:24 /sys/class/scsi_host/host1 -> ../../devices/pci0000:00/0000:00:07.1/host1/scsi_host/host1 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host10 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host10/scsi_host/host10 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host11 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host11/scsi_host/host11 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host12 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host12/scsi_host/host12 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host13 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host13/scsi_host/host13 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host14 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host14/scsi_host/host14 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host15 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host15/scsi_host/host15 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host16 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host16/scsi_host/host16 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host17 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host17/scsi_host/host17 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host18 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host18/scsi_host/host18 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host19 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host19/scsi_host/host19 lrwxrwxrwx 1 root root 0 Sep 2 06:24 /sys/class/scsi_host/host2 -> ../../devices/pci0000:00/0000:00:10.0/host2/scsi_host/host2 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host20 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host20/scsi_host/host20 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host21 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host21/scsi_host/host21 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host22 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host22/scsi_host/host22 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host23 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host23/scsi_host/host23 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host24 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host24/scsi_host/host24 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host25 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host25/scsi_host/host25 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host26 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host26/scsi_host/host26 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host27 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host27/scsi_host/host27 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host28 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host28/scsi_host/host28 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host29 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host29/scsi_host/host29 lrwxrwxrwx 1 root root 0 Sep 2 06:24 /sys/class/scsi_host/host3 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host3/scsi_host/host3 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host30 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host30/scsi_host/host30 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host31 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host31/scsi_host/host31 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host32 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host32/scsi_host/host32 lrwxrwxrwx 1 root root 0 Sep 2 06:24 /sys/class/scsi_host/host4 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host4/scsi_host/host4 lrwxrwxrwx 1 root root 0 Sep 2 06:24 /sys/class/scsi_host/host5 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host5/scsi_host/host5 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host6 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host6/scsi_host/host6 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host7 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host7/scsi_host/host7 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host8 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host8/scsi_host/host8 lrwxrwxrwx 1 root root 0 Sep 2 06:27 /sys/class/scsi_host/host9 -> ../../devices/pci0000:00/0000:00:11.0/0000:02:04.0/host9/scsi_host/host9
[root@linux_server ~]#

[root@linux_server ~]# for i in ls /sys/class/scsi_host/; do echo $i; cat /sys/class/scsi_host/$i/proc_name| grep -i mpt; done

host0 host1 host10 host11 host12 host13 host14 host15 host16 host17 host18 host19 host2 mptspi host20 host21 host22 host23 host24 host25 host26 host27 host28 host29 host3 host30 host31 host32 host4 host5 host6 host7 host8 host9

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[root@linux_server ~]# fdisk -l | grep -i disk |grep -v identifer | grep -v identifier | grep -v mapper

[root@linux_server ~]# ls -l /sys/block/sd*

[root@linux_server ~]# lspci | egrep -i "sata|scsi|ide"

[root@linux_server ~]# cat /sys/class/scsi_host/host*/proc_name | wc -l

33

[root@linux_server ~]# ls -l /sys/class/scsi_host/host*

[root@linux_server ~]# for i in ls /sys/class/scsi_host/; do echo $i; cat /sys/class/scsi_host/$i/proc_name| grep -i mpt; done

asked 25 mins ago

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[root@linux_server ~]# fdisk -l | grep -i disk |grep -v identifer | grep -v identifier | grep -v mapper

[root@linux_server ~]# ls -l /sys/block/sd*

[root@linux_server ~]# lspci | egrep -i "sata|scsi|ide"

[root@linux_server ~]# cat /sys/class/scsi_host/host*/proc_name | wc -l

33

[root@linux_server ~]# ls -l /sys/class/scsi_host/host*

[root@linux_server ~]# for i in ls /sys/class/scsi_host/; do echo $i; cat /sys/class/scsi_host/$i/proc_name| grep -i mpt; done

asked 25 mins ago

root

51 bronze badge

[root@linux_server ~]# fdisk -l | grep -i disk |grep -v identifer | grep -v identifier | grep -v mapper

[root@linux_server ~]# ls -l /sys/block/sd*

[root@linux_server ~]# lspci | egrep -i "sata|scsi|ide"

[root@linux_server ~]# cat /sys/class/scsi_host/host*/proc_name | wc -l

33

[root@linux_server ~]# ls -l /sys/class/scsi_host/host*

[root@linux_server ~]# for i in ls /sys/class/scsi_host/; do echo $i; cat /sys/class/scsi_host/$i/proc_name| grep -i mpt; done

linux

asked 25 mins ago

root

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asked 25 mins ago

root

51 bronze badge

asked 25 mins ago

root

51 bronze badge

asked 25 mins ago

root

51 bronze badge

asked 25 mins ago

root

51 bronze badge

add a comment |

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