This is more an FYI as to how we did it than an actual question. Took us a while to find all the info we needed to be able to split up the warm/hot and cold buckets to their own drives on an existing indexer AND an indexer in the cluster, so here's how we did it. So hopefully posting here will help alleviate the pain others might go through.
Our environment consists of a 3 node indexer cluster controlled by one master. Our Search Factor and Replication Factor were both 2. All our data was originally stored in one volume: /mnt/idx-storage. We'd like to move to a /mnt/idx-storage-warm and and /mnt/idx-storage-cold to split these buckets up. We'd like ~1 month of data on the warm/hot buckets and the rest on the cold. Our cluster lives on AWS.
Here's how we did it.
I did this exact thing a few weeks ago. It looks like you forgot to add the "How you did it part". I'm very interested in seeing your approach
Hi @ejharts2015 - If you could put your "How you did it" as an Answer below and "Accept" it, that would be great. That way your post doesn't look like it has been unanswered forever. Thanks!
We did a bunch of math to see how much storage space we'd need to do to determine drive sizes. For our setup/data ingestion we went with a 2 TB SSD (hot/warm) and a 16 TB (cold) storage solution. For the cold drives were using the new AWS cold storage as a cheaper alternative to long storage.
We put our cluster in maintenance mode and took down one indexer at a time, did all the following steps and brought it back up. We left the master in maintenance mode until all three indexers had been updated. We also pushed out a new indexes.conf file with the added "homePath.maxDataSizeMB = [number]" stanza to make our warm buckets small enough to fit on our new 2 TB drive.
Some other cleanup items:
1. Removing unneeded data from cold storage (since we cloned the drive)
2. Removing/Detaching the old 8TB drive.
Good luck! Hope this helps!