Changes between Version 5 and Version 6 of decommission_kvm

Timestamp:

Jun 22, 2012, 12:06:19 AM (13 years ago)

Author:

Ben Dean-Kawamura

Comment:

--

decommission_kvm

@@ -25 +25 @@
 == Ensure all sensitive data is overwritten ==
 
-For this step, login as `GUESTNAME@HOSTNAME.mayfirst.org` to ensure that you do not overwrite data for other guests.  Here we'll issue a dd command that writes zeros across the entire logical volume.  The command is:
+For this step, login as `GUESTNAME@HOSTNAME.mayfirst.org` to ensure that you do not overwrite data for other guests.  We want to zero out all bytes on the logic volume to avoid this.  However, be careful: doing this at full-speed can cause guests on the hosts to stop responding.  Use the pv command to limit the IO rate.  You may need to use apt-get to install pv on the host.  The command is:
 
 {{{
-$ dd if=/dev/zero of=/dev/mapper/VOLUMEGROUPNAME-LOGICALVOLUMENAME bs=1M
+$ pv --rate-limit=1m < /dev/zero > /dev/mapper/VOLUMEGROUPNAME-LOGICALVOLUMENAME
 }}}