[Bug 1422919] Re: Ephemeral device on G5 instances is incorrect due to GPT partition tables

[Ben Howard]

** Description changed:

- In the larger G-Series VM sizes (G4 and G5) we have SSD-backed ephemeral
- disks that are larger than 2TB, and so they look a little different;
- namely they now use a GPT partition table and they also have two
- partitions:
+ [IMPACT] Ephemeral storage on Microsoft Azure G4 and G5 instance types
+ use GPT partition tables by default. Cloud-init is not preparing the
+ ephemeral devices.
+ 
+ [FIX] Add GPT partition support to Cloud-init.
+ 
+ [VERIFICATION]
+ 
+ New image:
+ 1. Build image from -proposed
+ 2. Boot G4 and G5 instance
+ 3. Confirm that /mnt is mount as ext4 filesystem
+ 
+ Follow verification steps from Bug #1292648 (comment 3).
+ 
+ [RISK] This is a mild to medium risk change. However the changes are
+ mitigated in the fact that on Azure, ephemeral devices are extra-
+ ordinarily ephemeral; each boot may result in a new ephemeral device
+ being present. Azure users are advised to not rely on the ephemeral
+ storage at all (see Bug #1382257).
+ 
+ [ORIGINAL REPORT]
+ In the larger G-Series VM sizes (G4 and G5) we have SSD-backed ephemeral disks that are larger than 2TB, and so they look a little different; namely they now use a GPT partition table and they also have two partitions:
  
  ------------------------------------------------------------------
  Model: Msft Virtual Disk (scsi)
  Disk /dev/sdb: 6597GB
  Sector size (logical/physical): 512B/512B Partition Table: gpt Disk
  Flags:
  
  Number Start End Size File system Name Flags
-  1 17.4kB 134MB 134MB Microsoft reserved partition msftres
-  2 135MB 6597GB 6597GB ntfs Basic data partition
+  1 17.4kB 134MB 134MB Microsoft reserved partition msftres
+  2 135MB 6597GB 6597GB ntfs Basic data partition
  ------------------------------------------------------------------

** Changed in: cloud-init (Ubuntu)
       Status: Confirmed => In Progress

** Summary changed:

- Ephemeral device on G5 instances is incorrect due to GPT partition tables
+ [SRU] Ephemeral device on G5 instances is incorrect due to GPT partition tables

-- 
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to cloud-init in Ubuntu.
https://bugs.launchpad.net/bugs/1422919

Title:
  [SRU] Ephemeral device on G5 instances is incorrect due to GPT
  partition tables

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1422919/+subscriptions