We've got a server that uses lvm2 to handle a mysql volume. When the server had 2gb of memory, taking a snapshot for backups was perfectly smooth. When we added 2gb of memory more (total of 4gb), we started getting fatal errors:
[root@edge1 ~]# lvcreate -L500M -s -n mysqlbk /dev/edge/mysql
device-mapper ioctl cmd 9 failed: Cannot allocate memory
Couldn't load device 'edge-mysqlbk'.
Problem reactivating origin mysql
device-mapper ioctl cmd 9 failed: Cannot allocate memory
Couldn't load device 'edge-mysqlbk'.
Problem reactivating origin mysql
and dmesg showed:
device-mapper: Unable to allocate hash table space
device-mapper: error adding target to table
device-mapper: error adding target to table
This was with all services stopped, so nothing should have been using any of the 4gb of memory.
Any ideas?
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