Dne 06. 02. 22 v 16:16 Aidan Walton napsal(a):
Hi,
I've been chasing a problem now for a few weeks. I have a flaky SATA
controller that fails unpredictably and upon doing so all drives
attached are disconnected by the kernel. I have 2 discs on this
controller which are the components of a RAID1 array. mdraid fails the
disc (in its strange way) stating that one device is removed and the
other is active. Apparently this is the default mdraid approach. Even
though both devices are in fact failed. Regardless, the devmapper
device which is supporting an LVM logical volume on top of this raid
array, remains active. The logical volume is no longer listed by
lvdisplay, but dmsetup -c info shows:
Name Maj Min Stat Open Targ Event UUID
storage.mx.vg2-shared_sun_NAS.lv1 253 2 L--w 1 1 0
LVM-Ud9pj6QE4hK1K3xiAFMVCnno3SrXaRyTXJLtTGDOPjBUppJgzr4t0jJowixEOtx7
storage.mx.vg1-shared_sun_users.lv1 253 1 L--w 1 1 0
LVM-ypcHlbNXu36FLRgU0EcUiXBSIvcOlHEP3MHkBKsBeHf6Q68TIuGA9hd5UfCpvOeo
ubuntu_server--vg-ubuntu_server--lv 253 0 L--w 1 1 0
LVM-eGBUJxP1vlW3MfNNeC2r5JfQUiKKWZ73t3U3Jji3lggXe8LPrUf0xRE0YyPzSorO
The device in question is 'storage.mx.vg2-shared_sun_NAS.lv1'
As can be seen is displays 'open'
however lsof /dev/mapper/storage.mx.vg2-shared_sun_NAS.lv1
<blank>
fuser -m /dev/storage.mx.vg1/shared_sun_users.lv1
<blank>
dmsetup status storage.mx.vg2-shared_sun_NAS.lv1
0 976502784 error
dmsetup remove storage.mx.vg2-shared_sun_NAS.lv1
device-mapper: remove ioctl on storage.mx.vg2-shared_sun_NAS.lv1
failed: Device or resource busy
dmsetup wipe_table storage.mx.vg2-shared_sun_NAS.lv1
device-mapper: resume ioctl on storage.mx.vg2-shared_sun_NAS.lv1
failed: Invalid argument
You can't remove device with open count >0.
You've already replaced device target type with error - so whoever keeps this
device open gets error on all read & writes (and you would probably see it on
kernel log)
Your remaining problem is to figure out who holds devices open in kernel.
fusers shows only user-land apps - but not in-kernel users - so you should
probably try to see how you are usinf your devices - who is mounting/using them ?
If your kernel is working correctly - tools like 'lsblk' are typically quite
good at exposing your device tree..
But you would need to expose way more details to give more qualified advice...
Regards
Zdenek
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