Provision Storage on a Storage Host Using the CLIΒΆ
You can use the command line to configure the Ceph disks (OSDs disk) on storage hosts.
About this task
For more about OSDs, see StarlingX Storage Configuration and Management: Storage on Storage Hosts.
Prerequisites
To create or edit an OSD, you must lock the storage host. The system must have at least two other unlocked hosts with Ceph monitors. (Ceph monitors run on controller-0, controller-1, and storage-0 only).
To use a custom storage tier, you must create the tier first.
Procedure
List the available physical disks.
~(keystone_admin)]$ system host-disk-list storage-3 +--------------------------------------+-------------+------------+-------------+----------+---------------+--------------------------------------------+ | uuid | device_node | device_num | device_type | size_gib | available_gib | device_path | +--------------------------------------+-------------+------------+-------------+----------+---------------+--------------------------------------------+ | ba751efe-33sd-as34-7u78-df3416875896 | /dev/sda | 2048 | HDD | 51.2 | 0 | /dev/disk/by-path/pci-0000:00:0d.0-ata-2.0 | | e8751efe-6101-4d1c-a9d3-7b1a16871791 | /dev/sdb | 2064 | HDD | 10.2 | 10.1 | /dev/disk/by-path/pci-0000:00:0d.0-ata-3.0 | | ae851efe-87hg-67gv-9ouj-sd3s16877658 | /dev/sdc | 2080 | SSD | 8.1 | 8.0 | /dev/disk/by-path/pci-0000:00:0d.0-ata-4.0 | +--------------------------------------+-------------+------------+-------------+----------+---------------+--------------------------------------------+
List the available storage tiers.
~(keystone_admin)]$ system storage-tier-list ceph_cluster +--------------------------------------+---------+--------+----------------+ | uuid | name | status | backend_using | +--------------------------------------+---------+--------+----------------+ | 220f17e2-8564-4f4d-8665-681f73d13dfb | gold | in-use | 283e5997-ea... | | e9ddc040-7d5e-4e28-86be-f8c80f5c0c42 | storage | in-use | f1151da5-bd... | +--------------------------------------+---------+--------+----------------+
Create a storage function (an OSD).
Note
You cannot add a storage function to the root disk (/dev/sda in this example).
~(keystone_admin)]$ system host-stor-add usage: system host-stor-add [--journal-location [<journal_location>]] [--journal-size[<size of the journal MiB>]] [--tier-uuid[<storage tier uuid>]] <hostname or id> [<function>] <idisk_uuid>where <idisk_uuid> identifies an OSD. For example:
~(keystone_admin)]$ system host-stor-add storage-3 e8751efe-6101-4d1c-a9d3-7b1a16871791 +------------------+--------------------------------------------------+ | Property | Value | +------------------+--------------------------------------------------+ | osdid | 3 | | function | osd | | journal_location | e639f1a2-e71a-4f65-8246-5cd0662d966b | | journal_size_gib | 1 | | journal_path | /dev/disk/by-path/pci-0000:00:0d.0-ata-3.0-part2 | | journal_node | /dev/sdc1 | | uuid | fc7b2d29-11bf-49a9-b4a9-3bc9a973077d | | ihost_uuid | 4eb90dc1-2b17-443e-b997-75bdd19e3eeb | | idisk_uuid | e8751efe-6101-4d1c-a9d3-7b1a16871791 | | tier_uuid | e9ddc040-7d5e-4e28-86be-f8c80f5c0c42 | | tier_name | storage | | created_at | 2018-01-30T22:57:11.561447+00:00 | | updated_at | 2018-01-30T22:57:27.169874+00:00 | +------------------+--------------------------------------------------+
In this example, an SSD-backed journal function is available. For more about SSD-backed journals, see Storage Functions: OSDs and SSD-backed Journals. The Ceph journal for the OSD is automatically created on the journal function using a default size of 1 GiB. You can use the
--journal-sizeoption to specify a different size in GiB.If multiple journal functions exist (corresponding to multiple dedicated SSDs), then you must include the
--journal-locationoption and specify the journal function to use for the OSD. You can obtain the UUIDs for journal functions using the system host-stor-list command:~(keystone_admin)]$ system host-stor-list storage-3 +--------------------------------------+----------+-------+--------------+---------------+--------------------------+------------------+-----------+ | uuid | function | osdid | capabilities | idisk_uuid | journal_path | journal_size_gib | tier_name | +--------------------------------------+----------+-------+--------------+---------------+--------------------------+------------------+-----------| | e6391e2-8564-4f4d-8665-681f73d13dfb | journal | None | {} | ae8b1434-d... | None | 0 | | | fc7bdc40-7d5e-4e28-86be-f8c80f5c0c42 | osd | 3 | {} | e8751efe-6... | /dev/disk/by-path/pci... | 1.0 | storage | +--------------------------------------+----------+-------+--------------+---------------+--------------------------+------------------+-----------+If no journal function exists when the storage function is created, the Ceph journal for the OSD is collocated on the OSD.
If an SSD or NVMe drive is available on the host, you can add a journal function. For more information, see Add SSD-Backed Journals Using the CLI. You can update the OSD to use a journal on the SSD by referencing the journal function UUID, as follows:
~(keystone_admin)]$ system host-stor-update <osd_uuid> --journal-location <journal_function_uuid> [--journal-size <size>]
Postrequisites
Unlock the host to make the changes take effect. Wait for the host to be reported as unlocked, online, and available in the hosts list.
You can re-use the same settings with other storage nodes by creating and applying a storage profile. For more information, see the StarlingX Containers Installation Guide.
