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Document ephemeral SSD usage

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@@ -102,3 +102,12 @@ os_distro=ubuntu # example
@@ -102,3 +102,12 @@ os_distro=ubuntu # example
## Add SWAP file to instance
## Add SWAP file to instance
By default VMs after creation do not have SWAP partition. If you need to add a SWAP file to your system you can download and run [script](https://gitlab.ics.muni.cz/cloud/cloud-tools/blob/master/swap.sh) that create SWAP file on your VM.
By default VMs after creation do not have SWAP partition. If you need to add a SWAP file to your system you can download and run [script](https://gitlab.ics.muni.cz/cloud/cloud-tools/blob/master/swap.sh) that create SWAP file on your VM.
 
 
## Local SSDs
 
 
Default MetaCentrum Cloud storage is implemented via CEPH storage cluster deployed on top of HDDs. This configuration should be sufficient for most cases.
 
For instances, that requires high throughput and IOPS, it is possible to utilize hypervizor local SSDs. Requirements for instances on hypervizor local SSD:
 
* instances can be deployed only via API (CLI, Ansible, Terraform ...), instances deployed via web gui (Horizon) will always use CEPH for it's storage
 
* supported only by flavors with ssd-ephem suffix (e.g. hpc.4core-16ram-ssd-ephem)
 
* instances can be rebooted without prior notice or you can be required to delete them
 
* you can request them, when asking for new project, or for existing project on cloud@metacentrum.cz