Re: Newly-created arrays don't auto-assemble - related to hostname change?

[NeilBrown <neilb@suse.com>]

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On Fri, Nov 18 2016, Andy Smith wrote:

> Hi Neil,
>
> On Fri, Nov 18, 2016 at 03:08:23PM +1100, NeilBrown wrote:
>> Up to you, but I have an idea.
>> The udev rules files depends on 'blkid' having been run.
>>   /lib/udev/rules.d/60-persistent-storage.rules
>> does this, but not for
>>   KERNEL=="fd*|mtd*|nbd*|gnbd*|btibm*|dm-*|md*|zram*|mmcblk[0-9]*rpmb"
>> 
>> ... though that wouldn't apply to you.
>> 
>> what does
>>   udevadm info /dev/sdc
>
> (Since mpt3sas got loaded early the device identifiers have all
> changed; what was sd{a,b} have now shifted to the end as sd{e,f}, so
> the two members of md5 are now sd{a,b})
>
> $ sudo udevadm info /dev/sda
> P: /devices/pci0000:00/0000:00:01.0/0000:01:00.0/host0/port-0:0/end_device-0:0/target0:0:0/0:0:0:0/block/sda
> N: sda
> S: disk/by-id/ata-SAMSUNG_MZ7KM1T9HAJM-00005_S2HNNAAH200633
> S: disk/by-id/wwn-0x5002538c0007e7a8
> S: disk/by-path/pci-0000:01:00.0-sas-0x4433221100000000-lun-0
> E: DEVLINKS=/dev/disk/by-id/ata-SAMSUNG_MZ7KM1T9HAJM-00005_S2HNNAAH200633 /dev/disk/by-id/wwn-0x5002538c0007e7a8 /dev/disk/by-path/pci-0000:01:00.0-sas-0x4433221100000000-lun-0
> E: DEVNAME=/dev/sda
> E: DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/host0/port-0:0/end_device-0:0/target0:0:0/0:0:0:0/block/sda
> E: DEVTYPE=disk
> E: ID_ATA=1
> E: ID_ATA_DOWNLOAD_MICROCODE=1
> E: ID_ATA_FEATURE_SET_HPA=1
> E: ID_ATA_FEATURE_SET_HPA_ENABLED=1
> E: ID_ATA_FEATURE_SET_PM=1
> E: ID_ATA_FEATURE_SET_PM_ENABLED=1
> E: ID_ATA_FEATURE_SET_SECURITY=1
> E: ID_ATA_FEATURE_SET_SECURITY_ENABLED=0
> E: ID_ATA_FEATURE_SET_SECURITY_ENHANCED_ERASE_UNIT_MIN=32
> E: ID_ATA_FEATURE_SET_SECURITY_ERASE_UNIT_MIN=32
> E: ID_ATA_FEATURE_SET_SMART=1
> E: ID_ATA_FEATURE_SET_SMART_ENABLED=1
> E: ID_ATA_ROTATION_RATE_RPM=0
> E: ID_ATA_SATA=1
> E: ID_ATA_SATA_SIGNAL_RATE_GEN1=1
> E: ID_ATA_SATA_SIGNAL_RATE_GEN2=1
> E: ID_ATA_WRITE_CACHE=1
> E: ID_ATA_WRITE_CACHE_ENABLED=1
> E: ID_BUS=ata
> E: ID_FS_LABEL=tbd:5
> E: ID_FS_LABEL_ENC=tbd:5
> E: ID_FS_TYPE=linux_raid_member

This is encouraging.  It means that blkid ran and udev knows that this
is part of an md array.

However there are no "MD_" ... I guess that is normal if the latest udev
event happened after the array was assembled.

If you still want to get to the bottom of this, you might need to revert
your work-around, the try the "udevadm monitor" and "udevadm info" and "udevadm
trigger" while the array is not assembled.

You could possibly try stopping the array, then running "udevadm
trigger".
If that works, you revert the recent change to module loading.
If it doesn't result in the array being assembled, then would be a good
time to try "udevadm info" again.

NeilBrown


> E: ID_FS_USAGE=raid
> E: ID_FS_UUID=957030cf-c09f-023d-ceae-bb27e546f095
> E: ID_FS_UUID_ENC=957030cf-c09f-023d-ceae-bb27e546f095
> E: ID_FS_UUID_SUB=4ac82c29-2d10-9465-7fff-9b228c411c1e
> E: ID_FS_UUID_SUB_ENC=4ac82c29-2d10-9465-7fff-9b228c411c1e
> E: ID_FS_VERSION=1.2
> E: ID_MODEL=SAMSUNG_MZ7KM1T9HAJM-00005
> E: ID_MODEL_ENC=SAMSUNG\x20MZ7KM1T9HAJM-00005\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20
> E: ID_PATH=pci-0000:01:00.0-sas-0x4433221100000000-lun-0
> E: ID_PATH_TAG=pci-0000_01_00_0-sas-0x4433221100000000-lun-0
> E: ID_REVISION=GXM1003Q
> E: ID_SERIAL=SAMSUNG_MZ7KM1T9HAJM-00005_S2HNNAAH200633
> E: ID_SERIAL_SHORT=S2HNNAAH200633
> E: ID_TYPE=disk
> E: ID_WWN=0x5002538c0007e7a8
> E: ID_WWN_WITH_EXTENSION=0x5002538c0007e7a8
> E: MAJOR=8
> E: MINOR=0
> E: SUBSYSTEM=block
> E: TAGS=:systemd:
> E: UDEV_LOG=7
> E: USEC_INITIALIZED=38597
>
> Cheers,
> Andy

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