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Updated FAQ (markdown)

Chris Lu 2022-02-09 01:43:30 -08:00
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FAQ.md

@ -50,6 +50,12 @@ Another level of indirection can be added later for unlimited file size. Let me
Just do not over configure the number of volumes. Keep the total size smaller than your available disk size.
It is also important to leave some disk space for a couple of volume size, so that the compaction can run.
### Volume server consumes too much memory?
If one volume has large number of small files, the memory usage would be high in order to keep each entry in memory or in leveldb.
To reduce memory usage, one way is to convert the older volumes into Erasure-Coded volumes, which are read only. The volume server can will sort the index and store it as a sorted index file (with extension `.sdx`). So looking up one entry costs a binary search within the sorted index file, instead of O(1) memory lookup.
### How to configure volumes larger than 30GB?
Before 1.29, the maximum volume size is limited to 30GB. However, with recent larger disks, one 8TB hard drive can hold 200+ volumes. The large amount of volumes introduces unnecessary work load for master.