drbd 状态 角色 等信息
角色
drbdam role r0
主：Primary
备：Secondary
未知：Unknown
drbdam dstate r0
[D_DISKLESS] = "Diskless",
[D_ATTACHING] = "Attaching",
[D_FAILED] = "Failed",
[D_NEGOTIATING] = "Negotiating",
[D_INCONSISTENT] = "Inconsistent",
[D_OUTDATED] = "Outdated",
[D_UNKNOWN] = "DUnknown",
[D_CONSISTENT] = "Consistent",
[D_UP_TO_DATE] = "UpToDate",
连接状态
[C_STANDALONE] = "StandAlone",
[C_DISCONNECTING] = "Disconnecting",
[C_UNCONNECTED] = "Unconnected",
[C_TIMEOUT] = "Timeout",
[C_BROKEN_PIPE] = "BrokenPipe",
[C_NETWORK_FAILURE] = "NetworkFailure",
[C_PROTOCOL_ERROR] = "ProtocolError",
[C_WF_CONNECTION] = "WFConnection",
[C_WF_REPORT_PARAMS] = "WFReportParams",
[C_TEAR_DOWN] = "TearDown",
[C_CONNECTED] = "Connected",
[C_STARTING_SYNC_S] = "StartingSyncS",
[C_STARTING_SYNC_T] = "StartingSyncT",
[C_WF_BITMAP_S] = "WFBitMapS",
[C_WF_BITMAP_T] = "WFBitMapT",
[C_WF_SYNC_UUID] = "WFSyncUUID",
[C_SYNC_SOURCE] = "SyncSource",
[C_SYNC_TARGET] = "SyncTarget",
[C_PAUSED_SYNC_S] = "PausedSyncS",
[C_PAUSED_SYNC_T] = "PausedSyncT",
[C_VERIFY_S] = "VerifyS",
[C_VERIFY_T] = "VerifyT",
[C_AHEAD] = "Ahead",
[C_BEHIND] = "Behind",
static const char *drbd_state_sw_errors[] = {
[-SS_TWO_PRIMARIES] = "Multiple primaries not allowed by config",
[-SS_NO_UP_TO_DATE_DISK] = "Need access to UpToDate data",
[-SS_NO_LOCAL_DISK] = "Can not resync without local disk",
[-SS_NO_REMOTE_DISK] = "Can not resync without remote disk",
[-SS_CONNECTED_OUTDATES] = "Refusing to be Outdated while Connected",
[-SS_PRIMARY_NOP] = "Refusing to be Primary while peer is not outdated",
[-SS_RESYNC_RUNNING] = "Can not start OV/resync since it is already active",
[-SS_ALREADY_STANDALONE] = "Can not disconnect a StandAlone device",
[-SS_CW_FAILED_BY_PEER] = "State change was refused by peer node",
[-SS_IS_DISKLESS] = "Device is diskless, the requested operation requires a disk",
[-SS_DEVICE_IN_USE] = "Device is held open by someone",
[-SS_NO_NET_CONFIG] = "Have no net/connection configuration",
[-SS_NO_VERIFY_ALG] = "Need a verify algorithm to start online verify",
[-SS_NEED_CONNECTION] = "Need a connection to start verify or resync",
[-SS_NOT_SUPPORTED] = "Peer does not support protocol",
[-SS_LOWER_THAN_OUTDATED] = "Disk state is lower than outdated",
[-SS_IN_TRANSIENT_STATE] = "In transient state, retry after next state change",
[-SS_CONCURRENT_ST_CHG] = "Concurrent state changes detected and aborted",
[-SS_O_VOL_PEER_PRI] = "Other vol primary on peer not allowed by config",
};
===================
Drbd.conf is as follows:
> #
> # drbd.conf example
> #
> # parameters you _need_ to change are the hostname, device, disk, # meta-disk, address and port in the "on <hostname> {}" sections. # # you ought to know about the protocol, and the various timeouts. # # you probably want to set the rate in the syncer sections
>
> #
> # NOTE common pitfall:
> # rate is given in units of _byte_ not bit
> #
>
> #
> # increase timeout and maybe ping-int in net{}, if you see
> # problems with "connection lost/connection established"
> # (or change your setup to reduce network latency; make sure full # duplex behaves as such; check average roundtrip times while # network is saturated; and so on ...) #
>
> #
> # At most ONE global section is allowed.
> # It must precede any resource section.
> #
> global {
> # By default we load the module with a minor-count of 32. In case you
> # have more devices in your config, the module gets loaded with
> # a minor-count that ensures that you have 10 minors spare.
> # In case 10 spare minors are too little for you, you can set the
> # minor-count exeplicit here. ( Note, in contrast to DRBD-0.7 an
> # unused, spare minor has only a very little overhead of allocated
> # memory (a single pointer to be exact). )
> #
> # minor-count 64;
>
> # The user dialog counts and displays the seconds it waited so
> # far. You might want to disable this if you have the console
> # of your server connected to a serial terminal server with
> # limited logging capacity.
> # The Dialog will print the count each 'dialog-refresh' seconds,
> # set it to 0 to disable redrawing completely. [ default = 1 ]
> #
> # dialog-refresh 5; # 5 seconds
>
> # You might disable one of drbdadm's sanity check.
> # disable-ip-verification;
>
> # Participate in DRBD's online usage counter at http://usage.drbd.org
> # possilbe options: ask, yes, no. Default is ask. In case you do not
> # know, set it to ask, and follow the on screen instructions later.
> usage-count yes;
> }
>
>
> #
> # The common section can have all the sections a resource can have but # not the host section (started with the "on" keyword). # The common section must precede all resources. # All resources inherit the settings from the common section. # Whereas settings in the resources have precedence over the common # setting. #
>
> common {
> syncer { rate 10M; }
> }
>
> #
> # this need not be r#, you may use phony resource names,
> # like "resource web" or "resource mail", too
> #
>
> resource IsodeResource {
>
> # transfer protocol to use.
> # C: write IO is reported as completed, if we know it has
> # reached _both_ local and remote DISK.
> # * for critical transactional data.
> # B: write IO is reported as completed, if it has reached
> # local DISK and remote buffer cache.
> # * for most cases.
> # A: write IO is reported as completed, if it has reached
> # local DISK and local tcp send buffer. (see also sndbuf-size)
> # * for high latency networks
> #
> #**********
> # uhm, benchmarks have shown that C is actually better than B.
> # this note shall disappear, when we are convinced that B is
> # the right choice "for most cases".
> # Until then, always use C unless you have a reason not to.
> # --lge
> #**********
> #
> protocol C;
>
> handlers {
> # what should be done in case the node is primary, degraded
> # (=no connection) and has inconsistent data.
> pri-on-incon-degr "echo o > /proc/sysrq-trigger ; halt -f";
>
> # The node is currently primary, but lost the after split brain
> # auto recovery procedure. As as consequence it should go away.
> pri-lost-after-sb "echo o > /proc/sysrq-trigger ; halt -f";
>
> # In case you have set the on-io-error option to "call-local-io-error",
> # this script will get executed in case of a local IO error. It is
> # expected that this script will case a immediate failover in the
> # cluster.
> local-io-error "echo o > /proc/sysrq-trigger ; halt -f";
>
> # Commands to run in case we need to downgrade the peer's disk
> # state to "Outdated". Should be implemented by the superior
> # communication possibilities of our cluster manager.
> # The provided script uses ssh, and is for demonstration/development
> # purposis.
> # outdate-peer "/usr/lib/drbd/outdate-peer.sh on amd 192.168.22.11 192.168.23.11 on alf 192.168.22.12 192.168.23.12";
> #
> # Update: Now there is a solution that relies on heartbeat's
> # communication layers. You should really use this.
> outdate-peer "/usr/sbin/drbd-peer-outdater";
> }
>
> startup {
> # Wait for connection timeout.
> # The init script blocks the boot process until the resources
> # are connected. This is so when the cluster manager starts later,
> # it does not see a resource with internal split-brain.
> # In case you want to limit the wait time, do it here.
> # Default is 0, which means unlimited. Unit is seconds.
> #
> wfc-timeout 0;
>
> # Wait for connection timeout if this node was a degraded cluster.
> # In case a degraded cluster (= cluster with only one node left)
> # is rebooted, this timeout value is used.
> #
> degr-wfc-timeout 60; # 1 minute.
> }
>
> disk {
> # if the lower level device reports io-error you have the choice of
> # "pass_on" -> Report the io-error to the upper layers.
> # Primary -> report it to the mounted file system.
> # Secondary -> ignore it.
> # "call-local-io-error"
> # -> Call the script configured by the name "local-io-error".
> # "detach" -> The node drops its backing storage device, and
> # continues in disk less mode.
> #
> on-io-error detach;
>
> # Controls the fencing policy, default is "dont-care". Before you
> # set any policy you need to make sure that you have a working
> # outdate-peer handler. Possible values are:
> # "dont-care" -> Never call the outdate-peer handler. [ DEFAULT ]
> # "resource-only" -> Call the outdate-peer handler if we primary and
> # loose the connection to the secondary. As well
> # whenn a unconnected secondary wants to become
> # primary.
> # "resource-and-stonith"
> # -> Calls the outdate-peer handler and freezes local
> # IO immediately after loss of connection. This is
> # necessary if your heartbeat can STONITH the other
> # node.
> # fencing resource-only;
>
> # In case you only want to use a fraction of the available space
> # you might use the "size" option here.
> #
> # size 10G;
> }
>
> net {
> # this is the size of the tcp socket send buffer
> # increase it _carefully_ if you want to use protocol A over a
> # high latency network with reasonable write throughput.
> # defaults to 2*65535; you might try even 1M, but if your kernel or
> # network driver chokes on that, you have been warned.
> # sndbuf-size 512k;
>
> # timeout 60; # 6 seconds (unit = 0.1 seconds)
> # connect-int 10; # 10 seconds (unit = 1 second)
> # ping-int 10; # 10 seconds (unit = 1 second)
> # ping-timeout 5; # 500 ms (unit = 0.1 seconds)
>
> # Maximal number of requests (4K) to be allocated by DRBD.
> # The minimum is hardcoded to 32 (=128 kByte).
> # For high performance installations it might help if you
> # increase that number. These buffers are used to hold
> # datablocks while they are written to disk.
> #
> # max-buffers 2048;
>
> # When the number of outstanding requests on a standby (secondary)
> # node exceeds bdev-threshold, we start to kick the backing device
> # to start its request processing. This is an advanced tuning
> # parameter to get more performance out of capable storage controlers.
> # Some controlers like to be kicked often, other controlers
> # deliver better performance when they are kicked less frequently.
> # Set it to the value of max-buffers to get the least possible
> # number of run_task_queue_disk() / q->unplug_fn(q) calls.
> #
> # unplug-watermark 128;
>
>
> # The highest number of data blocks between two write barriers.
> # If you set this < 10 you might decrease your performance.
> # max-epoch-size 2048;
>
> # if some block send times out this many times, the peer is
> # considered dead, even if it still answers ping requests.
> # ko-count 4;
>
> # If you want to use OCFS2/openGFS on top of DRBD enable
> # this optione, and only enable it if you are going to use
> # one of these filesystems. Do not enable it for ext2,
> # ext3,reiserFS,XFS,JFS etc...
> # allow-two-primaries;
>
> # This enables peer authentication. Without this everybody
> # on the network could connect to one of your DRBD nodes with
> # a program that emulates DRBD's protocoll and could suck off
> # all your data.
> # Specify one of the kernel's digest algorithms, e.g.:
> # md5, sha1, sha256, sha512, wp256, wp384, wp512, michael_mic ...
> # an a shared secret.
> # Authentication is only done once after the TCP connection
> # is establised, there are no disadvantages from using authentication,
> # therefore I suggest to enable it in any case.
> # cram-hmac-alg "sha1";
> # shared-secret "FooFunFactory";
>
> # In case the nodes of your cluster nodes see each other again, after
> # an split brain situation in which both nodes where primary
> # at the same time, you have two diverged versions of your data.
> #
> # In case both nodes are secondary you can control DRBD's
> # auto recovery strategy by the "after-sb-0pri" options. The
> # default is to disconnect.
> # "disconnect" ... No automatic resynchronisation, simply disconnect.
> # "discard-younger-primary"
> # Auto sync from the node that was primary before
> # the split brain situation happened.
> # "discard-older-primary"
> # Auto sync from the node that became primary
> # as second during the split brain situation.
> # "discard-least-changes"
> # Auto sync from the node that touched more
> # blocks during the split brain situation.
> # "discard-node-NODENAME"
> # Auto sync _to_ the named node.
> after-sb-0pri disconnect;
>
> # In one of the nodes is already primary, then the auto-recovery
> # strategie is controled by the "after-sb-1pri" options.
> # "disconnect" ... always disconnect
> # "consensus" ... discard the version of the secondary if the outcome
> # of the "after-sb-0pri" algorithm would also destroy
> # the current secondary's data. Otherwise disconnect.
> # "violently-as0p" Always take the decission of the "after-sb-0pri"
> # algorithm. Even if that causes case an erratic change
> # of the primarie's view of the data.
> # This is only usefull if you use an 1node FS (i.e.
> # not OCFS2 or GFS) with the allow-two-primaries
> # flag, _AND_ you really know what you are doing.
> # This is DANGEROUS and MAY CRASH YOUR MACHINE if you
> # have a FS mounted on the primary node.
> # "discard-secondary"
> # discard the version of the secondary.
> # "call-pri-lost-after-sb" Always honour the outcome of the "after-sb-0pri"
> # algorithm. In case it decides the the current
> # secondary has the right data, it panics the
> # current primary.
> # "suspend-primary" ???
> after-sb-1pri disconnect;
>
> # In case both nodes are primary you control DRBD's strategy by
> # the "after-sb-2pri" option.
> # "disconnect" ... Go to StandAlone mode on both sides.
> # "violently-as0p" Always take the decission of the "after-sb-0pri".
> # "call-pri-lost-after-sb" ... Honor the outcome of the "after-sb-0pri"
> # algorithm and panic the other node.
>
> after-sb-2pri disconnect;
>
> # To solve the cases when the outcome of the resync descissions is
> # incompatible to the current role asignment in the cluster.
> # "disconnect" ... No automatic resynchronisation, simply disconnect.
> # "violently" .... Sync to the primary node is allowed, violating the
> # assumption that data on a block device is stable
> # for one of the nodes. DANGEROUS, DO NOT USE.
> # "call-pri-lost" Call the "pri-lost" helper program on one of the
> # machines. This program is expected to reboot the
> # machine. (I.e. make it secondary.)
> rr-conflict disconnect;
>
> # DRBD-0.7's behaviour is equivalent to
> # after-sb-0pri discard-younger-primary;
> # after-sb-1pri consensus;
> # after-sb-2pri disconnect;
> }
>
> syncer {
> # Limit the bandwith used by the resynchronisation process.
> # default unit is kByte/sec; optional suffixes K,M,G are allowed.
> #
> # Even though this is a network setting, the units are based
> # on _byte_ (octet for our french friends) not bit.
> # We are storage guys.
> #
> # Note that on 100Mbit ethernet, you cannot expect more than
> # 12.5 MByte total transfer rate.
> # Consider using GigaBit Ethernet.
> #
> rate 10M;
>
> # Normally all devices are resynchronized parallel.
> # To achieve better resynchronisation performance you should resync
> # DRBD resources which have their backing storage on one physical
> # disk sequentially. The express this use the "after" keyword.
> # after "r2";
>
> # Configures the size of the active set. Each extent is 4M,
> # 257 Extents ~> 1GB active set size. In case your syncer
> # runs @ 10MB/sec, all resync after a primary's crash will last
> # 1GB / ( 10MB/sec ) ~ 102 seconds ~ One Minute and 42 Seconds.
> # BTW, the hash algorithm works best if the number of al-extents
> # is prime. (To test the worst case performace use a power of 2)
> al-extents 257;
> }
>
> on amhs-1.tern.is {
> device /dev/drbd0;
> disk /dev/hda3;
> address 10.10.10.217:7788;
> flexible-meta-disk internal;
>
> # meta-disk is either 'internal' or '/dev/ice/name [idx]'
> #
> # You can use a single block device to store meta-data
> # of multiple DRBD's.
> # E.g. use meta-disk /dev/hde6[0]; and meta-disk /dev/hde6[1];
> # for two different resources. In this case the meta-disk
> # would need to be at least 256 MB in size.
> #
> # 'internal' means, that the last 128 MB of the lower device
> # are used to store the meta-data.
> # You must not give an index with 'internal'.
> }
>
> on amhs-2.tern.is {
> device /dev/drbd0;
> disk /dev/sda3;
> address 10.10.10.218:7788;
> meta-disk internal;
> }
> }
>