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FC06-053 Thin Provisioning for iSCSI and FC

FC06-053 Thin Provisioning for iSCSI and FC. Rick Jooss SANiSAN Business Unit. Agenda . What is Flexible or Thin Provisioning Types of Thin Provisioning ONTAP Variables Configurations Default Configuration Snapshot - Snapshot Auto delete Snapshot - Volume Auto grow

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FC06-053 Thin Provisioning for iSCSI and FC

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  1. FC06-053Thin Provisioning for iSCSI and FC Rick Jooss SANiSAN Business Unit

  2. Agenda • What is Flexible or Thin Provisioning • Types of Thin Provisioning • ONTAP Variables • Configurations • Default Configuration • Snapshot - Snapshot Auto delete • Snapshot - Volume Auto grow • Snapshot - Volume guarantee none • LUN - Volume guarantee none • LUN - LUN reservation disabled

  3. What is Thin Provisioning? • Presenting more space to the servers than the storage systems actually contains • Classic examples from other industries • Banks • Water Companies • Electric Companies • Insurance Companies • Large systems are needed

  4. Types of Thin Provisioning • Snapshot Space • Creating, mapping and snapshotting 100 x 100GB LUNs with less than 20+ TB (< 2X + Δ) • In the NAS world snapshot space is always thin provisioned • LUN Space • Creating and mapping 10TB (100 x 100GB) LUNs when the storage system only has 8TB • Only makes sense when one is not creating snapshots because having less than 10TB with snapshots is not reasonable

  5. Agenda • What is Flexible or Thin Provisioning • Types of Thin Provisioning • ONTAP Variables • Configurations • Default Configuration • Snapshot - Snapshot Auto delete • Snapshot - Volume Auto grow • Snapshot - Volume guarantee none • LUN - Volume guarantee none • LUN - LUN reservation disabled

  6. ONTAP variables affecting space usage • ONTAP Variables • Guarantee • LUN reservation • Fractional (space) Reservation • Snap Reserve • Auto Delete • Auto grow • Try first

  7. Guarantees • Set on a per volume basis • Determines when space is allocated from the aggregate • Possible settings • Volume (default)      • Space is reserved from the aggregate at volume creation time • This space is not available to other volumes regardless of how much is really used • None         • No space is reserved from the aggregate at volume creation time • Space is taken from the aggregate as data is written • Allows thin provisioning of volumes • Any individual volume still is not allowed to take more space than its size • File          • The same as none but allows individual LUNs (or files) to set space reservations to ensure they have adequate space

  8. LUN Reservation • Set on per LUN basis • Determines when space is allocated from the volume • Possible settings • enabled (default)      • Space is reserved from the volume at LUN creation time • This space is not available to other LUNs or files regardless of how much is really used • Disabled         • No space is reserved from the volume at volume LUN time • Space is taken from the volume as data is written

  9. Guarantees • Set on a per volume basis • Determines when space is allocated from the aggregate • Possible settings • Volume (default)      • Space is reserved from the aggregate at volume creation time • This space is not available to other volumes regardless of how much is really used • None         • No space is reserved from the aggregate at volume creation time • Space is taken from the aggregate as data is written • Allows thin provisioning of volumes • Any individual volume still is not allowed to take more space than its size • File          • The same as none but allows individual LUNs (or files) to set space reservations to ensure they have adequate space

  10. LUN Reservation • Set on per LUN basis • Determines when space is allocated from the volume • Possible settings • enabled (default)      • Space is reserved from the volume at LUN creation time • This space is not available to other LUNs or files regardless of how much is really used • Disabled         • No space is reserved from the volume at volume LUN time • Space is taken from the volume as data is written

  11. Fractional (space) Reservation • Set on a per volume basis • Determines if space is reserved from the volume at first snapshot creation • Possible settings • 100% (default)      • An amount of space equal to the amount of space used with in the LUNs is reserved from the volume • This space is not available to other LUNs or files regardless of how much is really used • 0 to 99%          • An amount of space equal to the amount of space used with in the LUNs times fractional_reserve is reserved from the volume reserved = LUN_SPACE * fractional_reserve

  12. Snap Reserve • Set on a per volume basis • Determines if space is allocated from the volume for Snapshot data at volume creation time • Possible settings • 20% (default for NAS)      • 0% (current default for SAN)   • 0% to 100% 

  13. Snapshot Auto Delete • Set on a per volume basis • Determines when (if) snapshots will be automatically deleted • Makes NetApp like competition but better • Possible settings • Triggers      • Volume • Snap Reserve • Space Reserve • Order • delete_order – oldest, newest • defer_delete – scheduled, user created, prefix, none • snapmirror/dump – try, disrupt • Snapshots locked by clones, cifs or restores will not be deleted – change planned for 7.3

  14. Volume Auto Grow • Set on a per volume basis • Determines if a volume should grow when it nearly full • Possible settings • ON • Maximum growth • Increment size • OFF •  Try_first option determines whether auto_grow or auto_delete is attempted first

  15. Agenda • What is Flexible or Thin Provisioning • Types of Thin Provisioning • ONTAP Variables • Configurations • Default Configuration • Snapshot - Snapshot Auto delete • Snapshot - Volume Auto grow • Snapshot - Volume guarantee none • LUN - Volume guarantee none • LUN - LUN reservation disabled

  16. Space Management – Default Configuration • Default Configuration: • Guarantee = volume • LUN reservation = on • Fractional_reserve = 100% • Snap_reserve = 0% • Auto_delete = off • Auto_grow = off • Try_first = NA Available space 40GB Reserve 30GB 30GB TestLUN

  17. Space Management – Default Configuration • Positives • Easy to manage/monitor space • Running “out” of space only results in no additional snapshots being created • SnapShots and active LUNs will always be available • Volumes are independent of each other • Negatives • Requires 2X + Δ space requirement

  18. Space Management – Default Configuration • Default Configuration: • Guarantee = volume • LUN reservation = on • Fractional_reserve = 100% • Snap_reserve = 0% • Auto_delete = off • Auto_grow = off • Try_first = NA Available space 40GB Reserve 30GB 30GB TestLUN

  19. Space Management – Default Configuration • Positives • Easy to manage/monitor space • Running “out” of space only results in no additional snapshots being created • SnapShots and active LUNs will always be available • Volumes are independent of each other • Negatives • Requires 2X + Δ space requirement

  20. Agenda • What is Flexible or Thin Provisioning • Types of Thin Provisioning • ONTAP Variables • Configurations • Default Configuration • Snapshot - Snapshot Auto delete • Snapshot - Volume Auto grow • Snapshot - Volume guarantee none • LUN - Volume guarantee none • LUN - LUN reservation disabled

  21. Thin Provisioning – Snapshot Space – Autodelete • Auto Delete Configuration: • Guarantee = volume • LUN reservation = on • Fractional_reserve = 0% • Snap_reserve = 20% • Auto_delete =snap_reserve • Auto_grow = off • Try_first = snap_delete SnapshotAvailable 20GB Available space 50GB 30GB TestLUN

  22. Thin Provisioning – Snapshot Space – Autodelete • Positives • Easy to monitor/understand space just volume and .snapshot • Sacrifices snapshots before active LUNs • Volumes are independent of each other • Looks like the competition • Negatives • Doesn’t use shared space from the aggregate • Until ONTAP 7.3 have to be cautious with using FlexClones

  23. Agenda • What is Flexible or Thin Provisioning • Types of Thin Provisioning • ONTAP Variables • Configurations • Default Configuration • Snapshot - Snapshot Auto delete • Snapshot - Volume Auto grow • Snapshot - Volume guarantee none • LUN - Volume guarantee none • LUN - LUN reservation disabled

  24. Thin Provisioning – Snapshot Space – Autogrow • Auto Grow Configuration: • Guarantee = volume • LUN reservation = on • Fractional_reserve = 0% • Snap_reserve = 0% • Auto_delete = volume • Auto_grow = on • Try_first = auto_grow

  25. Thin Provisioning – Snapshot Space – Autogrow • Positives • Uses shared free space from the aggregate for possible growth • Sacrifices snapshots before active LUNs • Can tune amount of thin provisioning per volume • Works even with a smaller number of volumes • Negatives • Volumes are not completely independent of one another • Always the case when using shared free space • Growth in one volume can limit growth of another

  26. Thin Provisioning – Autogrow Example Volume Grow – Starting Point volume used / size / consumedvol1 = 0 / 100 / 100vol2 = 0 / 100 / 100vol3 = 0 / 100 / 100------------------------------------total = 0 / 300 / 300free = 30

  27. Thin Provisioning – Autogrow Example Volume Grow – After volume growth volume used / size / consumedvol1 = 90 / 100 / 100vol2 = 120 / 120 / 120vol3 = 50 / 100 / 100------------------------------------total = 260 / 320 / 320free = 10 • Single volume grows to 120GB

  28. Thin Provisioning – Autogrow Example Volume Grow – After another volume grows volume used / size / consumedvol1 = 110 / 100 / 110vol2 = 120 / 100 / 120vol3 = 60 / 100 / 100------------------------------------total = 290 / 330 / 330free = 0 • Single volume grows to 120GB • Another volume grow to 110GB • Aggregate is now full

  29. Thin Provisioning – Autogrow Example Volume Grow – After freeing space volume used / size / consumedvol1 = 110 / 110 / 110vol2 = 110 / 110 / 110vol3 = 60 / 100 / 100------------------------------------total = 0 / 320 / 320free = 10 • Space is freed within the volume - manual snapshot deletion • Volume is manually resized

  30. Agenda • What is Flexible or Thin Provisioning • Types of Thin Provisioning • ONTAP Variables • Configurations • Default Configuration • Snapshot - Snapshot Auto delete • Snapshot - Volume Auto grow • Snapshot - Volume guarantee none • LUN - Volume guarantee none • LUN - LUN reservation disabled

  31. Thin Provisioning – Snapshot SpaceGuarantee = none • None Guarantee Configuration: • Guarantee = none • LUN reservation = on • Fractional_reserve = 0% • Snap_reserve = 0% • Auto_delete = volume • Auto_grow = off • Try_first = auto_delete

  32. Thin Provisioning – Snapshot SpaceGuarantee = none • Positives • Uses shared space from the aggregate • Negatives • Volumes are not independent of one another • Activity in some volumes can cause all volumes with a none guarantee to go offline • Generally only makes sense with a large number of volumes

  33. Thin Provisioning – Snapshot SpaceGuarantee = none - Example volume used / size / consumedvol1 = 0 / 150 / 0vol2 = 0 / 150 / 0vol3 = 0 / 150 / 0------------------------------------total = 0 / 450 / 0free = 330 • At volume creation no space is allocated from the aggregate

  34. Thin Provisioning – Snapshot SpaceGuarantee = none - Example volume used / size / consumedvol1 = 40 / 150 / 40vol2 = 100 / 150 / 100vol3 = 100 / 150 / 100------------------------------------total = 240 / 450 / 240free = 90

  35. Thin Provisioning – Snapshot SpaceGuarantee = none - Example volume used / size / consumedvol1 = 90 / 150 / 90vol2 = 120 / 150 / 120vol3 = 120 / 150 / 120------------------------------------total = 330 / 450 / 330 free = 0 • Highlights both the advantage and disadvantage of a none guarantee • Allows vol2 and vol3 to use space which vol1 is not using • If any volume consumes more space all volume with a guarantee of none are going to go offline on the next write

  36. Thin Provisioning – LUNs – Guarantee = NONE • Guarantee = none configuration: • Guarantee = none • LUN reservation = on • Fractional_reserve = NA (no snapshots) • Snap_reserve = 0% (no snapshots) • Auto_delete = snap_reserve (safety measure) • Auto_grow = off • Try_first = snap_delete

  37. Thin Provisioning – LUNs – Guarantee = NONE • Positives • Uses shared free space from the aggregate • Works with SDW without issues • Negative • Limited by BURT 210149Not possible to configure more a LUN larger than actual free space in the aggregate • For example, aggregate has 200GB free and you create a 400GB volume • It is possible to create 2 x 200GB or 4 x 100GB or 1000 x 100GB LUNs • It is not possible to create 1 x 201GB LUN

  38. Agenda • What is Flexible or Thin Provisioning • Types of Thin Provisioning • ONTAP Variables • Configurations • Default Configuration • Snapshot - Snapshot Auto delete • Snapshot - Volume Auto grow • Snapshot - Volume guarantee none • LUN - Volume guarantee none • LUN - LUN reservation disabled

  39. Thin Provisioning – LUNs – reservation disabled • LUN reservation disabled configuration: • Guarantee = volume • LUN reservation = off • Fractional_reserve = NA (no snapshots) • Snap_reserve = 0% (no snapshots) • Auto_delete = snap_reserve (safety measure) • Auto_grow = off • Try_first = NA

  40. Thin Provisioning – LUNs – reservation disabled • Positives • Volumes are independent of one another • Amount of thin provisioning can be tuned per volume • Negative • Doesn’t currently work with SDW • With Data ONTAP DSM 3.0, SDW is not needed for multipathing

  41. Agenda - Summary • Configurations • Default Configuration • Snapshot - Snapshot Auto delete • Snapshot - Volume Auto grow • Snapshot - Volume guarantee none • LUN - Volume guarantee none • LUN - LUN reservation disabled

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