I'm working with external USB drives for backup. I want to NOT keep
them connected full time, for the usual reasons that backups shouldn't
be mounted all the time; so I have to figure out how to disconnect them,
and reconnect them.
The external disk c4t0d0 (ap_id usb1/9) has a zfs pool named "wrack" on
it.
After doing zpool export wrack (which succeeds), cfgadm still shows the
device as connected and configured.
If I issue "cfgadm -c disconnect usb1/9", I get:
bash-3.2$ sudo cfgadm -c disconnect usb1/9
Disconnect the device: /devices/[EMAIL PROTECTED],0/pci10de,[EMAIL
PROTECTED],1:9
This operation will suspend activity on the USB device
Continue (yes/no)? yes
cfgadm: Hardware specific failure: Cannot issue devctl to ap_id:
/devices/[EMAIL PROTECTED],0/pci10de,[EMAIL PROTECTED],1:9
and usb1/9 still shows as connected and configured in cfgadm. (And I
get the same results if I try "unconfigure" instead.)
Furthermore, just trying to do this and having it fail logs the following:
Dec 14 22:21:45 fsfs usba: [ID 691482 kern.warning] WARNING:
/[EMAIL PROTECTED],0/pci10de,[EMAIL PROTECTED],1/[EMAIL PROTECTED] (scsa2usb0):
Disconnected device was
busy, please reconnect.
When I go ahead and pull the USB cable out, syslog shows a "device gone"
and an "offline" message for the device; and also "Dec 14 22:29:15 fsfs
SYNCHRONIZE CACHE command failed (5)" which is a little more worrying.
When I plug it back in after a few minutes, I find an "online" message
for the device in syslog, with nothing else looking like trouble. And
"zpool import wrack" works fine.
So everything is probably okay, I guess? I don't really like getting
things like the "device was busy" and "synchronize cache command failed"
messages in the log in normal operations! They make me worry. Are
there other things I could/should do to make the device more idle before
removing it?
(It's fun naming pairs or small collections of things; these two backup
drives, and the pools on them, are named "wrack" and "ruin"; seems
appropriate for backup drives somehow.)
--
David Dyer-Bennet, [EMAIL PROTECTED]; http://dd-b.net/
Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/
Photos: http://dd-b.net/photography/gallery/
Dragaera: http://dragaera.info
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