a-savchuk/frostfs-node
1
0
Fork 0
forked from TrueCloudLab/frostfs-node
Code Pull requests Activity

[#1121] docs: Change mode of shard components

Browse source 
Signed-off-by: Alexander Chuprov <a.chuprov@yadro.com>
This commit is contained in:
Alexander Chuprov 2024-06-04 16:29:27 +03:00 committed by Evgenii Stratonikov
parent 806236da78
commit 8fcd0f8f8d
1 changed files with 10 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
docs/shard-modes.md
View file

@ -14,7 +14,16 @@ Each mode is characterized by two important properties:
| `read-only` | Read-only mode, only read operations are allowed, metabase is available. |
| `degraded` | Degraded mode in which metabase and write-cache is disabled. It shouldn't be used at all, because metabase can contain important indices, such as LOCK objects info and modifying operation in this mode can lead to unexpected behaviour. The purpose of this mode is to allow PUT/DELETE operations without the metabase if really necessary. |
| `degraded-read-only` | Same as `degraded`, but with only read operations allowed. This mode is used during SSD replacement and/or when the metabase error counter exceeds threshold. |
| `disabled` | Currently used only in config file to temporarily disable a shard. |
| `disabled` | Currently used only in config file to temporarily disable a shard.
## Shard and Component Status
| Shard Mode | Metabase Mode | Blobstore Mode | Writecache Mode | Pilorama Mode | Blobovnicza Tree Mode | FSTree Mode |
|-----------------------|---------------|----------------|-----------------|---------------|-----------------------|-------------|
| `Read-Write` | READ_WRITE | READ_WRITE | READ_WRITE | READ_WRITE | READ_WRITE | READ_WRITE |
| `Read-Only` | READ_ONLY | READ_ONLY | READ_ONLY | READ_ONLY | READ_ONLY | READ_ONLY |
| `Degraded-Read-Write` | CLOSED | READ_WRITE | CLOSED | CLOSED | READ_WRITE | READ_WRITE |
| `Degraded-Read-Only` | CLOSED | READ_ONLY | CLOSED | CLOSED | READ_ONLY | READ_ONLY |
## Transition order