| 1 |
From 73f108fb3ae02f6dff552d16a37a41ba8c5ea707 Mon Sep 17 00:00:00 2001 |
| 2 |
From: Shad L. Lords <slords@mail.com> |
| 3 |
Date: Mon, 26 Oct 2009 17:21:07 -0600 |
| 4 |
Subject: [PATCH] Allow creating/mounting degraded raid arrays |
| 5 |
|
| 6 |
--- |
| 7 |
fsset.py | 32 ++++++++++++++++++++++++++++++-- |
| 8 |
raid.py | 18 ++++++++++++++---- |
| 9 |
2 files changed, 44 insertions(+), 6 deletions(-) |
| 10 |
|
| 11 |
diff --git a/fsset.py b/fsset.py |
| 12 |
index cee9ef7..b249172 100644 |
| 13 |
--- a/fsset.py |
| 14 |
+++ b/fsset.py |
| 15 |
@@ -2007,11 +2007,20 @@ class RAIDDevice(Device): |
| 16 |
self.minor) |
| 17 |
|
| 18 |
def raidTab (self, devPrefix='/dev'): |
| 19 |
+ if self.level == 1: |
| 20 |
+ nDisks = max(2, self.numDisks) |
| 21 |
+ elif self.level == 5: |
| 22 |
+ nDisks = max(3, self.numDisks) |
| 23 |
+ elif self.level == 6: |
| 24 |
+ nDisks = max(4, self.numDisks) |
| 25 |
+ else: |
| 26 |
+ nDisks = self.numDisks |
| 27 |
+ |
| 28 |
entry = "" |
| 29 |
entry = entry + "raiddev %s/%s\n" % (devPrefix, |
| 30 |
self.device,) |
| 31 |
entry = entry + "raid-level %d\n" % (self.level,) |
| 32 |
- entry = entry + "nr-raid-disks %d\n" % (self.numDisks,) |
| 33 |
+ entry = entry + "nr-raid-disks %d\n" % (nDisks,) |
| 34 |
entry = entry + "chunk-size %s\n" %(self.chunksize,) |
| 35 |
entry = entry + "persistent-superblock 1\n" |
| 36 |
entry = entry + "nr-spare-disks %d\n" % (self.spares,) |
| 37 |
@@ -2021,6 +2030,10 @@ class RAIDDevice(Device): |
| 38 |
device) |
| 39 |
entry = entry + " raid-disk %d\n" % (i,) |
| 40 |
i = i + 1 |
| 41 |
+ while i < nDisks: |
| 42 |
+ entry = entry + " device dev/null\n" |
| 43 |
+ entry = entry + " failed-disk %d\n" % (i,) |
| 44 |
+ i = i + 1 |
| 45 |
i = 0 |
| 46 |
for device in self.members[self.numDisks:]: |
| 47 |
entry = entry + " device %s/%s\n" % (devPrefix, |
| 48 |
@@ -2032,6 +2045,15 @@ class RAIDDevice(Device): |
| 49 |
def setupDevice (self, chroot="/", devPrefix='/dev'): |
| 50 |
def devify(x): |
| 51 |
return "/dev/%s" %(x,) |
| 52 |
+ |
| 53 |
+ if self.level == 1: |
| 54 |
+ nDisks = max(2, self.numDisks) |
| 55 |
+ elif self.level == 5: |
| 56 |
+ nDisks = max(3, self.numDisks) |
| 57 |
+ elif self.level == 6: |
| 58 |
+ nDisks = max(4, self.numDisks) |
| 59 |
+ else: |
| 60 |
+ nDisks = self.numDisks |
| 61 |
|
| 62 |
node = "%s/%s" % (devPrefix, self.device) |
| 63 |
isys.makeDevInode(self.device, node) |
| 64 |
@@ -2044,12 +2066,18 @@ class RAIDDevice(Device): |
| 65 |
args = ["/usr/sbin/mdadm", "--create", "/dev/%s" %(self.device,), |
| 66 |
"--run", "--chunk=%s" %(self.chunksize,), |
| 67 |
"--level=%s" %(self.level,), |
| 68 |
- "--raid-devices=%s" %(self.numDisks,)] |
| 69 |
+ "--raid-devices=%s" %(nDisks,)] |
| 70 |
|
| 71 |
if self.spares > 0: |
| 72 |
args.append("--spare-devices=%s" %(self.spares,),) |
| 73 |
|
| 74 |
args.extend(map(devify, self.members)) |
| 75 |
+ |
| 76 |
+ i = 0 |
| 77 |
+ while self.numDisks + i < nDisks: |
| 78 |
+ args.append("missing") |
| 79 |
+ i = i + 1 |
| 80 |
+ |
| 81 |
log("going to run: %s" %(args,)) |
| 82 |
iutil.execWithRedirect (args[0], args, |
| 83 |
stderr="/dev/tty5", stdout="/dev/tty5") |
| 84 |
diff --git a/raid.py b/raid.py |
| 85 |
index 3e99911..e210bf5 100644 |
| 86 |
--- a/raid.py |
| 87 |
+++ b/raid.py |
| 88 |
@@ -90,7 +90,17 @@ def scanForRaid(drives): |
| 89 |
raidList = [] |
| 90 |
for key in raidSets.keys(): |
| 91 |
(level, totalDisks, mdMinor, devices) = raidSets[key] |
| 92 |
- if len(devices) < totalDisks: |
| 93 |
+ if len(devices) == totalDisks - 1 and level in (1, 5, 6): |
| 94 |
+ log("missing components of raid device md%d. The " |
| 95 |
+ "raid device needs %d drive(s) and only %d (was/were) found. " |
| 96 |
+ "This raid device will be started in degraded mode.", mdMinor, |
| 97 |
+ totalDisks, len(devices)) |
| 98 |
+ elif len(devices) == totalDisks - 2 and level == 6: |
| 99 |
+ log("missing components of raid device md%d. The " |
| 100 |
+ "raid device needs %d drive(s) and only %d (was/were) found. " |
| 101 |
+ "This raid device will be started in degraded mode.", mdMinor, |
| 102 |
+ totalDisks, len(devices)) |
| 103 |
+ elif len(devices) < totalDisks: |
| 104 |
log("missing components of raid device md%d. The " |
| 105 |
"raid device needs %d drive(s) and only %d (was/were) found. " |
| 106 |
"This raid device will not be started.", mdMinor, |
| 107 |
@@ -160,11 +170,11 @@ def get_raid_min_members(raidlevel): |
| 108 |
if isRaid0(raidlevel): |
| 109 |
return 2 |
| 110 |
elif isRaid1(raidlevel): |
| 111 |
- return 2 |
| 112 |
+ return 1 |
| 113 |
elif isRaid5(raidlevel): |
| 114 |
- return 3 |
| 115 |
+ return 2 |
| 116 |
elif isRaid6(raidlevel): |
| 117 |
- return 4 |
| 118 |
+ return 2 |
| 119 |
else: |
| 120 |
raise ValueError, "invalid raidlevel in get_raid_min_members" |
| 121 |
|
| 122 |
-- |
| 123 |
1.5.5.6 |
| 124 |
|
Parent Directory
| 
Revision Log
| 
Revision Graph
