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Is it recommended to create SWAP on Ephemeral Disk, is it true?

How to make sure how many types of storage are connected to AWS Instance having only SSH access?

How would I make sure, I am accessing Ephemeral disk, Object Storage or Block storage? Or how to switch between different types of storage (i.e. Ephemeral, Object and Block)?

Is it possible that I can fire fdsisk command on particular kind of storage disk?

user3134198
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1 Answers1

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SWAP on Ephemeral Disk

  • True . This is because otherwise you're essentially sending your CPU to do a query into the network based EBS volume for the data.

use the curl command

~  curl http://169.254.169.254/latest/meta-data/block-device-mapping/
ami
ephemeral0
root% 

curl http://169.254.169.254/latest/meta-data/block-device-mapping/ephemeral0
sdb%

switching

Object Storage is the aws-s3 service. It's accessed via the aws-sdk OR via their api.

fdisk

will show both the EBS and Ephemeral as std disk. Equivalent of how normal san volumes show up on a linux box. You can parse the output from the the key value store to determine where the likely mount points are supposed to be.

Imran Ahmed
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  • Hi Imran! Thanks for your reply! I have tried to fire `curl` on m1.micro aws instance but it shows me only ebs2 storage it has. Does it mean that for small instance (i.e. CentOS 6.5 Free instance doesn't have ephemeral disk)? – user3134198 Sep 16 '14 at 12:24
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    those micro instances have nothing other than their root partition, which is the ebs volume by default. – Imran Ahmed Sep 16 '14 at 21:36
  • Thanks Imran Ahmed :) – user3134198 Sep 17 '14 at 04:35