My world of Unix and Storage

We have a peculiar situation where running multiple snapview clone sync results in I/O wait on the production application. This is a business requirement where we have to take a backup of the production copy before running the EOD (End of day) process and one copy immediately after the EOD (End of day). The duration for EOD varies between 45 minutes to 1 hour. This is the time when the I/O is maximum. The EOD period is not sufficient to schedule snapview sync for the post EOD after the split of Pre-EOD. Their is always an overlap, and that is the period when the user face extreme slowness. We can stripe the luns over multiple Raid groups for the production luns but space constraint prevents us from doing this. The solution what we found was to go for snapshot for Post EOD and with the normal sync for the EOD. 1. We add the luns to the reserved clone group. It depends on the size of the snapshot and the percentage change. 2. We create snapshot on the source luns and add it to the destin...

How you plan to use Linux LVM with a multipathing software like EMc powerpath? The trick is to mask out the non emcpower devices from LVM view. This is to ensure any path failure is handled by the multipathing software rather than LVM itself. The underlying path management complexity is offloaded to multipathing software. When the command pvscan, is issued you see only the emcpower devices. You will have to enable the filter for accepting the emcpower devices and reject all the non emcpower devices inside /etc/lvm/lvm.conf file filter =[ "a|/dev/emcpower.*|", "r|/dev/sd*|", "r|/dev/cdrom|" ] Ensure only one filter is enabled.