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Fix default HDD block size in docs (actual size is 1 MB)

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Vitaliy Filippov
2023-07-09 13:12:30 +03:00
parent e6646a5b2f
commit ee0c78fd74
4 changed files with 13 additions and 11 deletions
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docs/config/layout-cluster.en.md
+3 -2
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@@ -33,12 +33,13 @@ Size of objects (data blocks) into which all physical and virtual drives
in Vitastor, affects memory usage, write amplification and I/O load
distribution effectiveness.
Recommended default block size is 128 KB for SSD and 4 MB for HDD. In fact,
it's possible to use 4 MB for SSD too - it will lower memory usage, but
Recommended default block size is 128 KB for SSD and 1 MB for HDD. In fact,
it's possible to use 1 MB for SSD too - it will lower memory usage, but
may increase average WA and reduce linear performance.
OSD memory usage is roughly (SIZE / BLOCK * 68 bytes) which is roughly
544 MB per 1 TB of used disk space with the default 128 KB block size.
With 1 MB it's 8 times lower.
## bitmap_granularity