- **summary**: imm: return try-again on write requests when FS is unresponsive
--> imm: return try-again on write requests if FS is unresponsive
- **status**: review --> fixed
- **assigned_to**: Vu Minh Nguyen --> nobody
- **Comment**:
commit ecbdd454813cb2e5994143aa202535374d119392 (HEAD -> develop,
origin/develop, ticket-3019)
Author: Vu Minh Nguyen <vu.m.ngu...@dektech.com.au>
Date: Thu Apr 11 15:13:50 2019 +0700
imm: return try-again on write requests if fs is unavailable [#3019]
When underlying file system is unresponsive to pbe write request, all IMM
write requests that need their changes to be persistent such as apply of
ccb or
updates to persistent runtime attributes or creation/deletion of classes or
creation/deletion of persistent runtime objects likely gets
SA_AIS_ERR_TIMEOUT.
This patch introduces two administrative operations to let user inform IMM
about
the availibity of the file system. If the server (IMMND) detects the logical
unavailability of the file system through this variable, such write requets
will
get the honest code SA_AIS_ERR_TRY_AGAIN rather then SA_AIS_ERR_TIMEOUT.
Besides, a new IMM attribute, saImmFileSystemStatus, is added to
SaImmMngt class; the value shows the current status of the file system
according to IMM view
---
** [tickets:#3019] imm: return try-again on write requests if FS is
unresponsive**
**Status:** fixed
**Milestone:** 5.19.06
**Created:** Mon Mar 18, 2019 03:57 AM UTC by Vu Minh Nguyen
**Last Updated:** Tue Mar 26, 2019 06:20 AM UTC
**Owner:** nobody
With current design, when the file system (FS) is neither available nor
responsive, CCB apply on IMM OM side likely get SA_AIS_ERR_TIMEOUT error code
as osafpbed may be stuck at the activity of writing to sqlite3 database and
therefore is not able to respond to IMM in time.
With this ticket, we propose to introduce 02 new admin operations (set/clear)
towards IMM; using these operations to inform IMM if the file system is
unavailable or in healthy state. Based on that data, IMM will reject the write
request earlier with error code SA_AIS_ERR_TRY_AGAIN if the file system is
unavailable.
Besides, a runtime attribute `saImmFileSystemStatus` is added and owned by IMM
to show the status of underlying file system.
---
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