# Update instance count is failing on prod rack

**URL:** <https://community.convox.com/t/update-instance-count-is-failing-on-prod-rack/568>\
**Category:** Rack (Version 2)\
**Created:** [July 16, 2019, 9:31am UTC](https://community.convox.com/t/update-instance-count-is-failing-on-prod-rack/568 "2019-07-16T09:31:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![vijay.surwase](https://avatars.discourse-cdn.com/v4/letter/v/8e7dd6/32.png) [@vijay.surwase](https://community.convox.com/u/vijay.surwase)\
**Post date:** [July 16, 2019, 9:31am UTC](https://community.convox.com/t/update-instance-count-is-failing-on-prod-rack/568/1 "2019-07-16T09:31:50Z")

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Currently in our prod rack we do have 5 instances. we need to change minimum instance count to 6. please tell us the correct procedure

We tried using below command  
_convox rack params set InstanceCount=5_

somehow it increased instance count to 6 but after sometime it removed that extra instance.

what can we do ?

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<div class="post-metadata">

**Author:** ![edfricker](https://yyz1.discourse-cdn.com/flex029/user_avatar/community.convox.com/edfricker/32/95_2.png) [@edfricker](https://community.convox.com/u/edfricker)\
**Post date:** [August 7, 2019, 7:41pm UTC](https://community.convox.com/t/update-instance-count-is-failing-on-prod-rack/568/2 "2019-08-07T19:41:14Z")

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Not sure if that’s a typo in what you’ve said you tried but it should be:

```auto
convox rack params set InstanceCount=6

```

Do you also have the `Autoscale` parameter set to `true` ?