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Old 12-05-2016, 12:18 PM   #1
bravored
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Registered: Mar 2005
Distribution: RHEL, freeBSD, Solaris
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Post WWID udev rules


Hello Gurus

I need to set new udev rules - so my io scheduler and few others can be persistent across reboots.

Yes We already thought of the start up script.

-------------
ACTION=="change", KERNEL=="sda", ATTR{queue/scheduler}="noop"
-------------


I'm looking for some examples on getting WWID added in the line above and in additional to :queue/read_ahead_kb="0" also added

Been googling but havent the exact line example I am looking for

1)wwid
2)multiple attributes in one 1 line


Thanks!
 
Old 12-05-2016, 01:44 PM   #2
bravored
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Registered: Mar 2005
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Follow up

This works for me

SUBSYSTEM!="block", GOTO="end_rule"
ENV{DEVTYPE}=="partition", GOTO="end_rule"
ACTION!="add|change", GOTO="end_rule"
KERNEL=="sda", ATTR{queue/scheduler}="cfq", ATTR{queue/nr_requests}="128" ATTR{queue/rotational}="0" ATTR{queue/add_random}="0" ATTR{queue/read_ahead_kb}="0" LABEL="end_rule"

To get it activated with out reboot
# udevadm control --reload-rules
# udevadm trigger --type=devices --action=change

Still need to find out how to do it with WWID
 
Old 12-07-2016, 01:52 PM   #3
bravored
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Registered: Mar 2005
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Ok - how about how to find udevinfo on a WWID[udevadm info --query=all --path=/dev/xxxx] (when I ran multipath -l - saw like 6 block devices for the partition I want io scheduler changed)
i,e multipath -l (with some other info)
/dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdad

On my vmware test machine with no fc connections: {I am sure youd see something similar}

[root@localhost ]# udevadm info --query=all --path=/sys/block/sda
P: /devices/pci0000:00/0000:00:10.0/host2/target2:0:0/2:0:0:0/block/sda
N: sda
S: block/8:0
S: disk/by-path/pci-0000:00:10.0-scsi-0:0:0:0
E: UDEV_LOG=3
E: DEVPATH=/devices/pci0000:00/0000:00:10.0/host2/target2:0:0/2:0:0:0/block/sda
E: MAJOR=8
E: MINOR=0
E: DEVNAME=/dev/sda
E: DEVTYPE=disk
E: SUBSYSTEM=block
E: ID_SCSI=1
E: ID_VENDOR=VMware_
E: ID_VENDOR_ENC=VMware\x2c\x20
E: ID_MODEL=VMware_Virtual_S
E: ID_MODEL_ENC=VMware\x20Virtual\x20S
E: ID_REVISION=1.0
E: ID_TYPE=disk
E: ID_BUS=scsi
E: ID_PATH=pci-0000:00:10.0-scsi-0:0:0:0
E: ID_PART_TABLE_TYPE=dos
E: LVM_SBIN_PATH=/sbin
E: DEVLINKS=/dev/block/8:0 /dev/disk/by-path/pci-0000:00:10.0-scsi-0:0:0:0
E: UDISKS_PRESENTATION_NOPOLICY=0
E: UDISKS_PARTITION_TABLE=1
E: UDISKS_PARTITION_TABLE_SCHEME=mbr
E: UDISKS_PARTITION_TABLE_COUNT=3
 
  


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