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Homework and Emergencies Emergency UNIX and Linux Support RHEL and Centos VMs with IO failure on root Post 302604079 by sds9985 on Saturday 3rd of March 2012 12:41:02 AM
Old 03-03-2012
Storage is not intended to be intermittently connected and disconnected while in operation. You have a single point of failure there and the ext3 component of RHEL is trying to protect your data when your network fails and the one and only path to your disks go down.

The "patch" would be to provide redundant paths to your storage, which with iSCSI would give the added implicit benefit of redundant network connections.

Additionally, your environment would benefit from some form of change control, so that the potential impact of every proposed change to the environment - such as rebooting a network switch - is carefully considered and approved before it happens and is clearly documented.
 

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DOVEADM-KICK(1) 						      Dovecot							   DOVEADM-KICK(1)

NAME
doveadm-kick - Disconnect users by user name and/or IP address SYNOPSIS
doveadm [-Dv] kick [ -a anvil_socket_path] [-f] user doveadm [-Dv] kick [ -a anvil_socket_path] [-f] ip[/mask] doveadm [-Dv] kick [ -a anvil_socket_path] [-f] user ip[/mask] DESCRIPTION
doveadm's kick command is used to disconnect users by user name and/or the ip address, from which they are connected. In the first form, all users, whose login name matches the user argument, will be disconnected. In the second form, all users, connected from the given IP address or network range, will be disconnected. In the last form, only users connected from the given IP address or networks range and a matching login name will be disconnected. OPTIONS
Global doveadm(1) options: -D Enables verbosity and debug messages. -v Enables verbosity, including progress counter. Command specific options: -a anvil_socket_path This option is used to specify an absolute path to an alternative UNIX domain socket. By default doveadm(1) will use the socket /var/run/dovecot/anvil. The socket may be located in another directory, when the default base_dir setting was overridden in /etc/dovecot/dovecot.conf. -f Enforce the disconnect, even when there are multiple users, from different networks, connected to a single process. This option may be only required when you have configured something like: service imap { ... client_limit = 1+n service_count = 0 ... } ARGUMENTS
ip[/mask] ip or ip/mask is the host or network, from which the users are connected. user Is a user's login name. Depending on the configuration, a login name may be for example jane or john@example.com. It's also possi- ble to use '*' and '?' wildcards (e.g. -u *@example.org). EXAMPLE
If you don't want to disconnect all users at once, you can check who's currently logged in. The first example demonstrates how to discon- nect all users whose login name is 3 characters long and begins with ba. doveadm who -1 ja* username proto pid ip jane imap 8192 ::1 james imap 8203 2001:db8:543:2::1 doveadm kick ba? kicked connections from the following users: bar baz The next example shows how to kick user foo's connections from 192.0.2.*. doveadm who -1 foo username proto pid ip foo imap 8135 fd95:4eed:38ba::25 foo imap 9112 192.0.2.53 foo imap 8216 192.0.2.111 doveadm kick foo 192.0.2.0/24 kicked connections from the following users: foo doveadm who f* username # proto (pids) (ips) foo 1 imap (8135) (fd95:4eed:38ba::25) REPORTING BUGS
Report bugs, including doveconf -n output, to the Dovecot Mailing List <dovecot@dovecot.org>. Information about reporting bugs is avail- able at: http://dovecot.org/bugreport.html SEE ALSO
doveadm(1), doveadm-who(1) Dovecot v2.1 2010-06-12 DOVEADM-KICK(1)
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