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We have a Search Service Application which has 3 index partitions. Each of these partitions are paired on at least 2 servers.
My question is: If all servers which host replicas of a certain partition are down, should this effect the whole search service application, or should this mean that just the objects/results stored in that particular partition will not be available in search results? Or any other impact I have not mentioned?
Thanks
If each index partition contains only one index replica on different servers, and these servers down, the whole search service application will be affected.
Normally, to achieve fault tolerance for the SharePoint Server search index, we add additional index replicas for each index partition and distribute the index replicas over multiple servers.
More information for your reference:
https://learn.microsoft.com/en-us/sharepoint/search/manage-the-index-component
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@JulieWang-MSFT,
I should have included this screen print from the start, because it shows our Index Partition configuration and the replica's we have in place in our PROD env.
My question was if I lose both serves which host replicas of an individual partition, such as the two hosting Index Partition 1 shown below , what the impact would be. Based on your response I am assuming that this would mean the whole search services application would be effected.
The reason I am asking relates to a DR environment that we are configuring and our infrastructure team asking what servers they can leave out of the DR replication. If only one of the index partition replica pairs was available, for example Server 2 or Server 4, and then that server failed within the DR env, we would lose search functionality within the DR env. Hopefully this would not happen but I just wanted some proof to provide to the Infrastructure Team.
If you want to remove all index replicas under index partition 1, however still keep other index replicas under index partition 0 and 2, this will not affect the entire search service application.
Which I means that we cannot remove the last index replica of last index partition, it's necessary to have at least one index component in search topology.
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Thank you for your understanding.