Specifications

Configuration Recommendations
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_sack = 0
net.core.optmem_max = 16777216
net.ipv4.tcp_congestion_control=htcp
Configuration Recommendations
l Allocate a small (~100 MB) disk partition, located on the Fusion-io drive to place the bitmap
file. Create a filesystem on this partition and mount it, for example, at /bitmap:
# mount | grep /bitmap
/dev/fioa1 on /bitmap type ext3 (rw)
l Prior to creating your mirror, adjust the following parameters in /etc/de-
fault/LifeKeeper:
l
LKDR_CHUNK_SIZE=4096
l Default value is 64
l
LKDR_SPEED_LIMIT=1500000
l Default value is 50000
l LKDR_SPEED_LIMIT specifies the maximum bandwidth that a resync
will ever take — this should be set high enough to allow resyncs to go at
the maximum speed possible.
l
LKDR_SPEED_LIMIT_MIN=200000
l Default value is 20000
l LKDR_SPEED_LIMIT_MIN specifies how fast the resync should be
allowed to go when there is other I/O going on at the same time. As a rule
of thumb, this should be set to half or less of the drive’s maximum write
throughput in order to avoid starving out normal I/O activity when a
resync occurs.
l Create your mirrors and configure the cluster as you normally would.
308Administration