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Use separate disks for WAL and data #984

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Use separate disks for WAL and data #984

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Commits on Aug 31, 2024

  1. Use separate disks for WAL and data 

    One of the performance optimization technique for insertion according
to Timescaledb blog is to use separate disks for WAL & data.

According to blog [1],
```
Use separate disks for WAL and data
-----------------------------------
While this is a more advanced optimization that isn't always needed, if your disk becomes a bottleneck,
you can further increase throughput by using a separate disk (tablespace) for the database's write-ahead log (WAL) and data.
```

[1] https://www.timescale.com/blog/13-tips-to-improve-postgresql-insert-performance/
    @anasanjaria
    anasanjaria committed Aug 31, 2024
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  2. Adjust wal fast source logic to explicitly connsider data directory 

    Simplified logic of wal_fast can be found here [1] which is as follows:
```
WAL_FAST=$(dirname "$DATA_DIR")/wal_fast
```
Hence, aligning with the same logic to keep things simple. This way, it will not conflict
with separate WAL directory too.

[1] https://github.com/anasanjaria/spilo/blob/master/postgres-appliance/scripts/basebackup.sh
    @anasanjaria
    anasanjaria committed Aug 31, 2024
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