How to configure indexes.conf to keep large volume of data?

[balachandar]

Hi,

We have cluster indexer setup with 5 indexers on separate ESX Servers each with 12TB HDD and 128GB RAM.
The cluster replication factor(RF) is 2 and Search factor(SF) is 1. We have one Job scheduler and search head and forwarder nodes.
Splunk version 6.5.3

Our daily log volume is close to 1TB/day. Out of 1TB log volume 85% of data goes to abc_transaction indexes (RAW data).
In our indexes.conf file we have set frozenTimePeriodInSecs = 3888000 (45 days) for abc_transaction RAW index.
Even though we have set frozenTimePeriodInSecs as 45 days, it is able to search only last 10 days of abc_transaction RAW data.

So to keep the abc_transaction data available for 45 days, we have gone through this Splunk sizing link and added maxVolumeDataSizeMB = 5976884(5.7TB) attribute for abc_transaction index.

https://splunk-sizing.appspot.com/#ar=0&c=1&cr=30&ds=4096&hwr=60&i=5&rf=2&rl=10,01&sf=1&v=1000

indexes.conf

[abc_transaction]
repFactor=auto
coldPath = $SPLUNK_DB/abc_transaction/colddb
homePath = $SPLUNK_DB/abc_transaction/db
thawedPath = $SPLUNK_DB/abc_transaction/thaweddb
maxMemMB = 20
maxConcurrentOptimizes = 6
maxHotIdleSecs = 86400
maxHotBuckets = 10
maxDataSize = auto_high_volume
frozenTimePeriodInSecs = 3888000
maxVolumeDataSizeMB = 5976884

The following are my questions:

1. Which one do I have to use, maxVolumeDataSizeMB or maxTotalDataSizeMB inside the abc_transaction index.
2. If the customer wants to keep 90 days of abc_transaction data, as per the Splunk sizing link which I mentioned above the maxVolumeDataSizeMB = 11.4TB which is almost the disk size of the indexer, is it possible to set the entire disk size as maxVolumeDataSizeMB?

Any help would be greatly appreciated.

Thanks
Bala.

[davpx]

Your estimation of 5.7T is pretty close. I'd include a little extra room just in case and let your frozen time period take care of trimming the index. maxTotalDataSizeMB is the right one to use here as you don't seem to be using volume management on this index.

[ddrillic]

@balachandar, the big twin is -

maxTotalDataSizeMB = 1400000
frozenTimePeriodInSecs= 7776000

Retention, in this case, is 3 months and total size at around 1.4 TBs.

[balachandar]

@ddrillic, thanks.

May i know how do you calculated maxTotalDataSizeMB = 1400000 for the index abc_transaction

[ddrillic]

oh, that was just my index. We just need to calculate it with any of the online calculators...