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Storage Systems: Advanced Topics Learning Objectives: To understand limitations of “one file system per partition” model To understand Logical Volume Management.

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Presentation on theme: "Storage Systems: Advanced Topics Learning Objectives: To understand limitations of “one file system per partition” model To understand Logical Volume Management."— Presentation transcript:

1 Storage Systems: Advanced Topics Learning Objectives: To understand limitations of “one file system per partition” model To understand Logical Volume Management – its motivations and its facilities To understand how Storage Area Networks extend these features to multiple systems To relate LVM and SAN to a most modern file system implementation COMP

2 Storage Virtualization File System Code –assumes 1 file system –to 1 disk drive (partition) Stripe/Mirror/RAID changes this Storage Virtualization: break filesystem/drive relationship COMP OS Device Drivers File System

3 Logical Volume Management Virtual mapping between file system code and physical device Analogous (but not identical!) to virtual memory addressing “Volume Group” of all drives in a pool Storage space in “Volume Group” divided into “Physical Extents” – usually all same size “Logical Volume” is set of “Physical Extents” COMP

4 Logical Volume Management Mirror/Stripe/RAID provided within LVM layer Resize filesystem “Snapshot” a live filesystem COMP OS Device Drivers File System LVM layer Volume Group

5 e.g. Linux Server / - mostly read – want fast seeks swap – read/write – want high bandwidth /opt – infrequent access /var – huge, infrequent access Mirror / Stripe swap spare space to /opt and /var COMP

6 LVM Example: Now we can share resources more flexibly and more efficiently – but only on one server COMP Mirror / Stripe swap /var /opt

7 Storage Area Networking Implement LVM features in separate storage controller Connect multiple servers to storage controller via SCSI, or FibreChannel, or Infiniband, or … (n.b. SAN over Ethernet is conventionally called Networked Attached Storage (NAS) Now can share disk resources across multiple servers Rapid migration of disk images COMP

8 Storage Area Network Controller COMP “Blade Servers” SAN Controller

9 SAN Key Features Functionality –Key element of “system virtualization” –Migrating virtual machines –“De-duping” – share common subsets of file systems (think Virtual Machine images!) Management: –Manage storage separately from server physical resources –Maximize flexibility of storage provisioning COMP

10 ZFS – Volume Aware File System Marketing claims: Lost a file? Run out of space? Difficult disk upgrade? Want to grow/shrink? Data Corruption? COMP Pools of storage

11 ZFS techniques Lost a file? –Copy-on-write – simple rollback/recovery Run out of space/Difficult disk upgrade? –Add new storage to live systems –Self-checking, self-healing Want to grow/shrink? Data Corruption? –end-to-end sumchecking COMP

12 ZFS Implementation ZFS Combines File Service and Logical Volume Management Is this a good idea? Discuss COMP


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