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ONE DOES NOT SIMPLY CREATE MULTIPLE BACKENDS IN CINDER

ONE DOES NOT SIMPLY CREATE MULTIPLE BACKENDS IN CINDER. Walter Boring IV - HPE hemna - @hemna Jay Bryant - IBM jungleboyj - @jungleboyj Sean McGinnis - Dell smcginnis - @seantmcginnis Kendall Nelson - IBM diablo_rojo - @knelson92. YOU HAVE TO LISTEN TO OUR PRESENTATION FIRST. Agenda.

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ONE DOES NOT SIMPLY CREATE MULTIPLE BACKENDS IN CINDER

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  1. ONE DOES NOT SIMPLY CREATE MULTIPLE BACKENDS IN CINDER Walter Boring IV - HPE hemna - @hemna Jay Bryant - IBM jungleboyj - @jungleboyj Sean McGinnis - Dell smcginnis - @seantmcginnis Kendall Nelson - IBM diablo_rojo - @knelson92 • YOU HAVE TO LISTEN TO OUR PRESENTATION FIRST

  2. Agenda • What is Cinder? • How Does Cinder Fit? • Attaching a Volume Examples • Cinder Architecture • Cinder Services • Cinder.conf • Cinder Drivers • Multiple Backends!! • Volume Types • Retype vs. Migration • Future Plans

  3. What is Cinder? • Created in Folsom Release (~4 years ago) • Spun off from Nova volume • Cinder manages block storage • Different from file level storage- that’s Manila • Different from object storage- that’s Swift • Focuses on • Attaching volumes to VM instances • Booting from volumes • Volumes have life cycles independent of VM instances

  4. How Does Cinder Fit? • Cinder provides all commands and API’s to interact with vendors’ storage backends • Exposes vendors storage hardware to the cloud • Provides persistent storage to VM’s • Enables user to manage their storage • Create • Snapshot • Backup • Attach/Detach

  5. Attaching a Volume Ex. 1 Cinder Nova Note that iSCSI is just an example – several additional protocols are supported (e.g., FC, NFS) LVM VM instance /dev/vda iSCSI target Legend Persistent volume control Persistent volume data KVM iSCSI initiator

  6. Attaching a Volume Ex. 2 Cinder Nova Note that iSCSI is just an example – several additional protocols are supported (e.g., FC, NFS) Storage Controller VM instance /dev/vda iSCSI target Legend Persistent volume control Persistent volume data KVM iSCSI initiator

  7. Cinder Architecture client SQL DB REST cinder-api cinder-scheduler cinder-backup cinder-volume driver cinder-volume driver Storage

  8. Cinder Services • API • REST interface to Cinder • Generally runs on control node • Scheduler • Takes requests from API service • Works with volume services to satisfy requests • Generally runs on control node

  9. Cinder Services cont. • Volume • Interacts with vendor storage backends • Create • Manage • Export • Can run on control node, or some other node • Backup • Interface from backup volumes to storage like Swift, TSM, etc.

  10. Cinder Client /OpenStack Client • Cinder Client • python-cinderclient is the command line interface to Cinder • ‘ cinder <command> ’ • Uses REST to communicate with the cinder-api service • Generally runs of control node • OpenStack Client • All projects moving towards using the OpenStack Client • Deprecating all individual project CLI’s

  11. Cinder Client / API • Volume create/delete/list/show • Create from image/snapshot/volume • Attach/detach (called in Nova) • Snapshot create/delete/list/show • Backup create/delete/list/show/restore/import/export • Volume types create/update/delete • QoS • Quotas

  12. cinder.conf • Used by all of Cinder's services • Multi-backend support is enabled by a different section for each driver • enabled_backends is used to set which drivers you want actually running for your system • enabled_backends = lvmdriver-1,lvmdriver-2,lvmdriver-3

  13. cinder.conf (cont.) • Set debug=True and verbose=True to get additional logging output • By default Cinder's logs go to /var/log/cinder • When using devstack: /opt/stack/logs • When using iSCSI make sure the right iscsi_helper is set: tgtadm for ubuntu, lioadm for RHEL • Any changes made to the cinder.conf file require the Cinder services to be restarted before they can take affect

  14. Cinder Drivers • Block Device Driver (local) • Blockbridge (iSCSI) • CloudByte (iSCSI) • Coho (NFS) • Datera (iSCSI) • Dell Equallogic (iSCSI) • Dell Storage Center (iSCSI/FC) • Disco (disco) • DotHill (iSCSI/FC) • DRBD (DRBD/iSCSI) • EMC VMAX (iSCSI/FC) • EMC VNX (iSCSI/FC) • EMC XtremIO (iSCSI/FC) • EMC ScaleIO (scaleio) • Fujitsu ETERNUS (iSCSI/FC) • GlusterFS (GlusterFS) • HGST (NFS) • HPE 3PAR (iSCSI/FC) • HPE LeftHand (iSCSI) • HPE MSA (iSCSI/FC) • Oracle Zfssa (iSCSI/NFS) • Pure Storage (iSCSI/FC) • ProphetStor (iSCSI/FC) • Quobyte (quobyte) • RBD (Ceph) - Reference • Scality SOFS (scality) • Sheepdog (sheepdog) • SMBFS (SMB) • SolidFire (iSCSI) • Tegile (iSCSI/FC) • Tintri (NFS) • Violin (FC) • VMware (VMDK) • Virtuozzo Storage (NFS) • Windows (SMB) • X-IO technologies (iSCSI/FC) • HPE XP (FC) • Hitachi HBSD (iSCSI/FC) • Hitachi HNAS (iSCSI/NFS) • Huawei (iSCSI/FC) • IBM DS8000 (FC) • IBM Flashsystem (iSCSI/FC) • IBM GPFS (GPFS) • IBM Storwize SVC (iSCSI/FC) • IBM XIV (iSCSI/FC) • Infortrend (iSCSI/FC) • Lenovo (iSCSI/FC) • LVM (iSCSI) - Reference • NetApp ONTAP (iSCSI/NFS/FC) • NetApp E Series (iSCSI/FC) • Nexenta (iSCSI/NFS) • NFS (NFS) – Reference • Nimble Storage (iSCSI) (Drivers in bold are the reference for the architecture)

  15. Ex. cinder.conf with Multiple Backends

  16. Enabling Multiple Backends

  17. Volume Types • Only admins can create volume types • Control user’s access to different storage • Type can be associated with a particular backend • Type can have a list of desired capabilities • Users specify the volume type when they create a volume

  18. Volume Types (cont.) • In Horizon you can: • Create vol types • List vol_types • Set keys for a type • Show the keys set for a type • Using CinderClient you can: • Create vol types • List vol_types • Set keys for a type • Show the keys set for a type

  19. Volume Types (cont.)

  20. Volume Types (cont.)

  21. Volume Types (cont.)

  22. Volume Types (cont.)

  23. Volume Types (cont.)

  24. Volume Types (cont.)

  25. Retype Vs. Migration • CONFUSION • Retype is used to change settings of a volume on the same backend • i.e. Storwize SCSI disks to SSD disks on the same array • Some retypes can happen without the data moving • Migration is used to move a volume between two different backends • i.e. from LVM to Storwize • Retypes may require a migration

  26. Retype Change volume types: • cinder create 1 --name vol1 --volume-type dellsc1-nightly • cinder retype vol1 dellsc1-hourly

  27. Retype with Migration Change volume types: • cinder create 1 --name vol1 --volume-type dellsc1-nightly • cinder retype vol1 dellsc2-hourlyFAILS!

  28. Retype with Migration Change volume types: • cinder create 1 --name vol1 --volume-type dellsc1-nightly • cinder retype vol1 dellsc2-hourly \ --migration-policy on-demand

  29. Migration Migrating volume to new host: • cinder create 1 --name vol1 --volume-type lvm1 • cinder migrate vol1 Cinder2@VendorX#Pool1 Cinder1 Cinder2 LVM1 VendorX Pool1 Pool2

  30. Retype Vs. Migration (cont.)

  31. Retype Vs. Migration (cont.)

  32. Retype Vs. Migration (cont.)

  33. Retype Vs. Migration (cont.)

  34. DISCLAIMER: These are things being currently worked, but may not necessarily make it into Newton The Future! • Active/Active High Availability • Two cinder-volume services managing the same backend storage • Multi-attach • Attach the same volume to more than one host/instance • Scaleable Backup • Containerizing Cinder Services • Capability Reporting

  35. Thank You!

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