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XAM and OSD. J Jensen hepsysman RAL June 2008. Middleware/Apps. open(), fopen(). Kernel. Filesystem. scsi etc. Device. File. Middleware/Apps. Kernel. Filesystem. Device. File. Middleware/Apps. File. meta data. Kernel. Filesystem. Device. File. Middleware/Apps. File. meta - PowerPoint PPT Presentation
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XAM and OSD
J Jensenhepsysman RAL June 2008
Filesystem
Device
Middleware/Apps
open(), fopen()
Kernel
scsi etc
Filesystem
Device
Middleware/Apps
Kernel
File
Filesystem
Device
Middleware/Apps
Kernel
File metadata
File
Filesystem
Device
Middleware/Apps
Kernel
File
metadata
File
File
metadata
metadata
Filesystem
Device
Middleware/Apps
Kernel
File
metadata
File
File
metadata
metadata
Introducing OSD
• Object Storage Devices• SNIA (www.snia.org)• Standardisation: ANSI T10
(www.t10.org)
Filesystem
Device
Kernel
Filemetadata
Device stores objects rather than blocksKnows about metadataDevices do space management & security
object
DeviceFile
metadata
Panasas
Lustre
• Consistent view, enforced at low level• Improve scalability and performance
object
OSD Feature(sets)
• Object creation/access (duh)
• Meta: format, list, flush (partial (v2))
• Data Security– Integrity, in-flight enc
• 64 bit friendly CDB (v2)
• Device security– CDB capabilities (v2)
• Groups (collections)– Bulk ops (v2)
• Partition mgmt– Clone/snapshot (v2)
• Exception mgmt (v2)
eXtensible Access Method
• API• Metadata• Records• Querying
Filesystem
Middleware/Apps
Kernel
File
metadata
File
File
metadata
metadata
• Storage system can access metadata– Recovery– Device data is meaningful– ILM
XSet - XAM Objects
• Hierarchical• XLibrary
> XSystem > XSet
XAM to OSD
• Recommendation – XSet to Object– Names stored as OSD attributes– Different options for properties
• Functions to commands• Management policies• Ongoing work…
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