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Chapter 5. Configure performance improvements

Some deployments benefit from additional configuration to achieve optimal performance. This section covers recommended additional configuration for certain deployments.

If your main storage devices are not Solid State Disks (SSDs), Red Hat recommends configuring a logical volume cache (lvmcache) to achieve the required performance for Red Hat Hyperconverged Infrastructure for Virtualization deployments.

  1. Create the gdeploy configuration file

    Create a gdeploy configuration file named lvmcache.conf that contains at least the following information. Note that the ssd value should be the device name, not the device path (for example, use sdb not /dev/sdb).

    Example lvmcache.conf file

    [hosts]
<Gluster_Network_NodeA>
<Gluster_Network_NodeB>
<Gluster_Network_NodeC>

[lv1]
action=setup-cache
ssd=sdb
vgname=gluster_vg_sdb
poolname=gluster_thinpool_sdb
cache_lv=lvcache
cache_lvsize=220GB
#cachemode=writethrough
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    Important

    Ensure that disks specified as part of this deployment process do not have any partitions or labels.

    Important

    The default cache mode is writethrough, but writeback mode is also supported. To avoid the potential for data loss when implementing lvmcache in writeback mode, two separate SSD/NVMe devices are highly recommended. By configuring the two devices in a RAID-1 configuration (via software or hardware), the potential of data loss from lost writes is reduced significantly.

  2. Run gdeploy

    Run the following command to apply the configuration specified in lvmcache.conf. 

    # gdeploy -c lvmcache.conf
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For further information about lvmcache configuration, see Red Hat Enterprise Linux 7 LVM Administration: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Logical_Volume_Manager_Administration/LV.html#lvm_cache_volume_creation.

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