February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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How to do it...
Assuming pg1 is our current primary node, follow these steps as the root user:
- Activate the second LVM volume with this command:
lvchange -a y VG_POSTGRES/LV_DATA
- Count the number of CPUs on the primary node.
- Multiply the CPU count by four.
- If the total in the previous step is less than 256, use 256.
- Use this command to find the Linux kernel version:
uname -r
- For kernel versions 3.0 and above, format the XFS filesystem with this command, setting agcount to the value derived in the preceding steps:
mkfs.xfs -d agcount=256 /dev/VG_POSTGRES/LV_DATA
- For kernels below 3.0, format with this command:
mkfs.xfs -d agcount=256 -l size=128m -l lazy-count=1 \
-i attr=2 /dev/VG_POSTGRES/LV_DATA
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