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new 8d9dddc14d NO-JIRA clarify doc on shared store read performance on
startup, both replicated and shared store need to read the journal!
8d9dddc14d is described below
commit 8d9dddc14d77437baa55540b8da67e570d48290c
Author: Gary Tully <[email protected]>
AuthorDate: Tue Sep 2 12:19:24 2025 +0100
NO-JIRA clarify doc on shared store read performance on startup, both
replicated and shared store need to read the journal!
---
docs/user-manual/ha.adoc | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/docs/user-manual/ha.adoc b/docs/user-manual/ha.adoc
index 4934d60f31..db3aeff7f9 100644
--- a/docs/user-manual/ha.adoc
+++ b/docs/user-manual/ha.adoc
@@ -86,10 +86,8 @@ Typically, this will be some kind of high performance
Storage Area Network (SAN)
Network Attached Storage (NAS), like an <<NFS Mount Recommendations,NFS
mount>>, is viable but won't provide optimal performance.
One main advantage of a shared store configuration is that no replication
occurs between the primary and backup nodes which means it does not suffer any
performance penalties due to the overhead of replication during normal
operation.
-
-One potentially significant disadvantage of shared store versus replication is
that it requires a shared file system, and when the backup server activates it
needs to load the journal from the shared store which can take some time
depending on the amount of data in the store and the speed of the store.
-
-If you require the highest performance during normal operation then acquire
access to a fast SAN and deal with a slightly slower failover (depending on
amount of data).
+The main disadvantage is that shared stores are typically less performant than
local file stores. In particular, because the journal is always read in full on
startup, the difference in read latency between local and shared storage can be
a significant startup overhead. The shared store may need to be optimised for
reads of size journal-file-size.
+If you require the highest performance then acquire access to a fast SAN.
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