# Storage updates, revisited

DevFeed: [Storage updates, revisited](<https://devfeed.tech/articles/storage-updates-revisited-19751.md>)

Original publisher: [Read original article](<https://cloud.blog.csc.fi/2016/12/storage-updates-revisited.html>)

Author: Jukka Nousiainen (noreply@blogger.com)

Published: 2016-12-13T13:19:00Z

Content type: news

Language: en

Sources: [CSC - IT Center For Science - Cloud Team](<https://devfeed.tech/sources/csc-it-center-for-science-cloud-team.md>)

Topics: [cloud-infrastructure](<https://devfeed.tech/topics/cloud-infrastructure.md>), [migration](<https://devfeed.tech/topics/migration.md>), [ceph](<https://devfeed.tech/topics/ceph.md>), [systems](<https://devfeed.tech/topics/systems.md>)

Tags: [ceph](<https://devfeed.tech/tags/ceph.md>), [cpouta](<https://devfeed.tech/tags/cpouta.md>), [migration](<https://devfeed.tech/tags/migration.md>), [storage](<https://devfeed.tech/tags/storage.md>), [systems](<https://devfeed.tech/tags/systems.md>), [updates](<https://devfeed.tech/tags/updates.md>)

## AI overview

The article revisits cPouta storage changes, including the migration of most detached HPC storage volumes to standard Ceph-based volumes. It also announces a December 28-30, 2016 service break, during which affected virtual machines may be forcefully shut down, and explains that Ceph will become cPouta's only storage system.

## Source excerpt

Run of the Mill Back in September we blogged about disabling the possibility to create older cPouta volume types. This was the first step on the path to a more streamlined cPouta storage backend. Continuing on this path, we have now migrated most detached HPC storage volumes to standard volumes, and contacted users about their migration options for HPC storage volumes still attached to VMs. Next up, there will be a service break for the whole HPC storage environment, followed by severing the link between cPouta and the HPC storage backend for good. As pictures are often better than a thousand words, we'd like to illustrate these changes for the pleasure of the astute observer. Here's a (very) simplified diagram of cPouta's connectivity to its storage systems: Figure 1. Current topology of cPouta storage backends. The HPC storage system on the left hosts cPouta volumes that are visible to the user as "hpc-storage" or as the dash sign "-". The Ceph-based storage system on the right hosts cPouta volumes that are visible to the user as "standard". Going forward this Ceph-based system will be the only storage system of cPouta. Let it down The next upcoming change potentially affecting cPouta users is the service break for HPC storage systems between December 28th-30th 2016. Components affected by this maintenance are highlighted in Figure 2. Figure 2. Scope of service break on Dec 28th-30th 2016. Maintenance work on the cPouta specific storage controller will occur on December 29th. On this date, any cPouta VMs which still have hpc-storage volumes attached will be forcefully shut down to allow hypervisors to gracefully terminate their iSCSI connections to the HPC storage backend. Apologies about this inconvenience, which is unavoidable with the current firmware/kernel versions. All things must pass Throughout 2016 there has been aggressive growth in the utilization of CSC clouds' volume storage. This has been largely possible thanks to the elasticity of the Ceph-based st