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md updates for 3.9
mostly little bugfixes. Only "feature" is a new RAID10 layout which slightly improves the number of sets of devices that can concurrently fail, without data loss. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) iQIVAwUAUTPm+znsnt1WYoG5AQLLsw/+PMqr8roC4twgxTWV1NRbU8NtOcRi9Rj9 uvBS63uYAaLdi/D3UBKFYczmNCu9knuXbcp9SgFDxH7LlthQsWN/GYnif06pPo3w 9Agu5M8c062TJEG1vrnX6FhPO6pNgrWFr3h+CKkTiD3179i9DoQpP8LXQToeyMtI YRMQf/zCkxYtDvWAP0iwsEWtw8cf+q9I/uGPhQ1L+DnZapXYdbtnqWBRz9q6mrDt orcGrP41aZHvnOHUaTbwmaorCKkf/Ys4SMaGenrSFpnpQMypt7VgNuwHC59LxvJT 5eiFG/26zIsv7Wk0jv/TvFP5qzUPo0/PFkd5ug0ArvbVRiXS2cMJDwQvMdO1toxD i5Bb+P9DptadvoWhOTgIpxnG77yRH45wJvyJOk+ZfS1/IO87nCRa3d0yiNOU5e2/ o0VdXPZRr72sdKKTK6kQuYfwCPb+Z2Pz6Q8BJdk6GxlmTXyP6sKhIgwUX86534fE LrOxfK8qV+GetVu3X02RoX2CyJJRQHXyXmbHuSzXuo/JiOYtDigAydwNZChvf+tf OoMY9K8vgNbhnGsUG6la7XPvZ+6dZMjdnxp2HB99Ml5A3PWZd75i5T6IHHxIQFbD C3z9PWTWP+hK4k15DEyjlELtsE9WduGTXG4kUcf328xJ/7lj4VIImVugdCz+1B6z +HlI6BiLwzY= =YdVD -----END PGP SIGNATURE----- Merge tag 'md-3.9' of git://neil.brown.name/md Pull md updates from NeilBrown: "Mostly little bugfixes. Only "feature" is a new RAID10 layout which slightly improves the number of sets of devices that can concurrently fail, without data loss." * tag 'md-3.9' of git://neil.brown.name/md: md: expedite metadata update when switching read-auto -> active md: remove CONFIG_MULTICORE_RAID456 md/raid1,raid10: fix deadlock with freeze_array() md/raid0: improve error message when converting RAID4-with-spares to RAID0 md: raid0: fix error return from create_stripe_zones. md: fix two bugs when attempting to resize RAID0 array. DM RAID: Add support for MD's RAID10 "far" and "offset" algorithms MD RAID10: Improve redundancy for 'far' and 'offset' algorithms (part 2) MD RAID10: Improve redundancy for 'far' and 'offset' algorithms (part 1) MD RAID10: Minor non-functional code changes md: raid1,10: Handle REQ_WRITE_SAME flag in write bios md: protect against crash upon fsync on ro array
This commit is contained in:
Linus Torvalds
commit
a5e0d73163
9 changed files with 256 additions and 102 deletions
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@ -30,6 +30,7 @@ The target is named "raid" and it accepts the following parameters:
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raid10 Various RAID10 inspired algorithms chosen by additional params
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- RAID10: Striped Mirrors (aka 'Striping on top of mirrors')
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- RAID1E: Integrated Adjacent Stripe Mirroring
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- RAID1E: Integrated Offset Stripe Mirroring
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- and other similar RAID10 variants
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Reference: Chapter 4 of
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@ -64,15 +65,15 @@ The target is named "raid" and it accepts the following parameters:
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synchronisation state for each region.
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[raid10_copies <# copies>]
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[raid10_format near]
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[raid10_format <near|far|offset>]
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These two options are used to alter the default layout of
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a RAID10 configuration. The number of copies is can be
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specified, but the default is 2. There are other variations
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to how the copies are laid down - the default and only current
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option is "near". Near copies are what most people think of
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with respect to mirroring. If these options are left
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unspecified, or 'raid10_copies 2' and/or 'raid10_format near'
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are given, then the layouts for 2, 3 and 4 devices are:
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specified, but the default is 2. There are also three
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variations to how the copies are laid down - the default
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is "near". Near copies are what most people think of with
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respect to mirroring. If these options are left unspecified,
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or 'raid10_copies 2' and/or 'raid10_format near' are given,
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then the layouts for 2, 3 and 4 devices are:
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2 drives 3 drives 4 drives
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-------- ---------- --------------
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A1 A1 A1 A1 A2 A1 A1 A2 A2
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@ -85,6 +86,33 @@ The target is named "raid" and it accepts the following parameters:
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3-device layout is what might be called a 'RAID1E - Integrated
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Adjacent Stripe Mirroring'.
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If 'raid10_copies 2' and 'raid10_format far', then the layouts
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for 2, 3 and 4 devices are:
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2 drives 3 drives 4 drives
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-------- -------------- --------------------
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A1 A2 A1 A2 A3 A1 A2 A3 A4
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A3 A4 A4 A5 A6 A5 A6 A7 A8
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A5 A6 A7 A8 A9 A9 A10 A11 A12
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.. .. .. .. .. .. .. .. ..
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A2 A1 A3 A1 A2 A2 A1 A4 A3
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A4 A3 A6 A4 A5 A6 A5 A8 A7
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A6 A5 A9 A7 A8 A10 A9 A12 A11
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.. .. .. .. .. .. .. .. ..
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If 'raid10_copies 2' and 'raid10_format offset', then the
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layouts for 2, 3 and 4 devices are:
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2 drives 3 drives 4 drives
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-------- ------------ -----------------
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A1 A2 A1 A2 A3 A1 A2 A3 A4
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A2 A1 A3 A1 A2 A2 A1 A4 A3
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A3 A4 A4 A5 A6 A5 A6 A7 A8
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A4 A3 A6 A4 A5 A6 A5 A8 A7
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A5 A6 A7 A8 A9 A9 A10 A11 A12
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A6 A5 A9 A7 A8 A10 A9 A12 A11
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.. .. .. .. .. .. .. .. ..
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Here we see layouts closely akin to 'RAID1E - Integrated
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Offset Stripe Mirroring'.
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<#raid_devs>: The number of devices composing the array.
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Each device consists of two entries. The first is the device
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containing the metadata (if any); the second is the one containing the
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@ -142,3 +170,5 @@ Version History
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1.3.0 Added support for RAID 10
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1.3.1 Allow device replacement/rebuild for RAID 10
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1.3.2 Fix/improve redundancy checking for RAID10
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1.4.0 Non-functional change. Removes arg from mapping function.
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1.4.1 Add RAID10 "far" and "offset" algorithm support.
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