原子加速器vqn-outline

花猫破解版

原子加速器vqn-outline

Make a simple simulation !

Use your own crushmap :

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Or create a sample clushmap :

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Simulate the rule 0 or your own :

$ crushtool --test -i crushmap --rule 0 --show-mappings --min-x 0 --max-x 10 --num-rep 2

CRUSH rule 0 x 0 [0,12]
CRUSH rule 0 x 1 [5,24]
CRUSH rule 0 x 2 [9,14]
CRUSH rule 0 x 3 [30,11]
CRUSH rule 0 x 4 [20,10]
CRUSH rule 0 x 5 [28,0]
CRUSH rule 0 x 6 [6,34]
CRUSH rule 0 x 7 [19,31]
CRUSH rule 0 x 8 [17,26]
CRUSH rule 0 x 9 [9,20]
CRUSH rule 0 x 10 [10,33]

crushtool --test -i crushmap --rule 0 --show-mappings --min-x 0 --max-x 10 --num-rep 3

CRUSH rule 0 x 0 [0,12,32]
CRUSH rule 0 x 1 [5,24,20]
CRUSH rule 0 x 2 [9,14,28]
CRUSH rule 0 x 3 [30,11,13]
CRUSH rule 0 x 4 [20,10,31]
CRUSH rule 0 x 5 [28,0,12]
CRUSH rule 0 x 6 [6,34,14]
CRUSH rule 0 x 7 [19,31,6]
CRUSH rule 0 x 8 [17,26,5]
CRUSH rule 0 x 9 [9,20,30]
CRUSH rule 0 x 10 [10,33,12]

In general it’s going well. But in some cases it could be better to test.

原子加速器vqn-outline

In some cases, some operations may take a little longer to be processed by the osd. And the operation may fail, or even make the OSD to suicide. There are many parameters for these timeouts. Some examples :

Thread suicide timed out

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heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7f1ee3ca7700' had suicide timed out after 150
common/HeartbeatMap.cc: In function 'bool ceph::HeartbeatMap::_check(ceph::heartbeat_handle_d*, const char*, time_t)' thread 7f1f0c2a3700 time 2017-03-03 11:03:46.550118
common/HeartbeatMap.cc: 79: FAILED assert(0 == "hit suicide timeout")

花猫破解版

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花猫破解osd_op_thread_suicide_timeout = 900

Operation thread timeout

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heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7fd306416700' had timed out after 15
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ceph tell osd.XX injectargs --osd-op-thread-timeout 90
(default value is 15s)

Recovery thread timout

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heartbeat_map is_healthy 'OSD::recovery_tp thread 0x7f4c2edab700' had timed out after 30
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ceph tell osd.XX injectargs --osd-recovery-thread-timeout 180
花猫破解版

For more details, please refer to ceph documentation :

http://docs.ceph.com/docs/master/rados/configuration/osd-config-ref/

原子加速器vqn-outline

Erasure code is rather designed for clusters with a sufficient size. However if you want to use it with a small amount of hosts you can also adapt the crushmap for a better matching distribution to your need.

Here a first example for distributing data with 1 host OR 2 drive fault tolerance with k=4, m=2 on 3 hosts and more.

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rule erasure_ruleset {
  ruleset X
  type erasure
花猫破解版  max_size 6
  step take default
  step choose indep 3 type host
  step choose indep 2 type osd
  step emit
}
花猫破解版

原子加速器vqn-outline

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rule replicated_ruleset {
  ruleset X
  type replicated
花猫破解版  max_size 3
  step take default
  step choose firstn 2 type datacenter
  step chooseleaf firstn -1 type host
  step emit
}

This working well with pool size=2 (not recommended!) or 3. If you set pool size more than 3 (and increase the max_size in crush), be careful : you will have n-1 replica on one side and only one on the other datacenter.

If you want to be able to write data even when one of the datacenters is inaccessible, pool min_size should be set at 1 even if size is set to 3. In this case, pay attention to the monitors location.

Read on →

原子加速器vqn-outline

Aaahhh full disk this morning. Sometimes the logs can go crazy, and the files can quickly reach several gigabytes.

Show debug option (on host) :

# Look at log file
tail -n 1000 /var/log/ceph/ceph-osd.33.log

# Check debug levels
ceph daemon osd.33 config show | grep '"debug_'
    "debug_none": "0\/5",
    "debug_lockdep": "0\/1",
    "debug_context": "0\/1",
    "debug_crush": "1\/1",
    "debug_mds": "1\/5",
    ...
    "debug_filestore": "1\/5",
    ...

In my case it was about filestore, so “ceph tell” is my friend to apply the new value to the whole cluster (on admin host) :

ceph tell osd.* injectargs --debug-filestore 0/5

Now you can remove the log file on reopen it :

rm /var/log/ceph/ceph-osd.33.log

ceph daemon osd.33 log reopen

Then it will remain to be added in the ceph.conf file (on each osd hosts) :

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Read on →

原子加速器vqn-outline

It’s always pleasant to see how fast new features appear in Ceph. :)

Here is a non-exhaustive list of some of theme on the latest releases :

Kraken (October 2016)

  • BlueStore declared as stable
  • AsyncMessenger
  • RGW : metadata indexing via Elasticseasrch, index resharding, compression
  • S3 bucket lifecycle API, RGW Export NFS version 3 throw Ganesha
  • Rados support overwrites on erasure-coded pools / RBD on erasure coded pool (experimental)

花猫破解

  • CephFS declared as stable
  • RGW multisite rearchitected (Allow active/active configuration)
  • AWS4 compatibility
  • RBD mirroring
  • BlueStore (experimental)
Read on →

原子加速器vqn-outline

Occasionally it may be useful to check the version of the OSD on the entire cluster :

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花猫破解
花猫破解版

原子加速器vqn-outline

Of course, the simplest way is using the command ceph osd tree.

Note that, if an osd is down, you can see “last address” in ceph health detail :

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$ ceph health detail
...
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Also, you can use:

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$ ceph osd find 37
{
    花猫破解: 37,
    "ip": "172.16.4.68:6804\/636",
    "crush_location": {
        "datacenter": 花猫破解,
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        "physical-host": "store-front-03.ssdr",
        花猫破解版: 花猫破解版,
        "root": 花猫破解版
    }
}

To get partition UUID, you can use ceph osd dump (see at the end of the line) :

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$ ceph osd dump | grep ^osd.37
osd.37 down out weight 0 up_from 56847 up_thru 57230 down_at 57538 last_clean_interval [56640,56844) 172.16.4.72:6801/16852 172.17.2.37:6801/16852 172.17.2.37:6804/16852 172.16.4.72:6804/16852 exists d7ab9ac1-c68c-4594-b25e-48d3a7cfd182

$ ssh 172.17.2.37 | blkid | grep d7ab9ac1-c68c-4594-b25e-48d3a7cfd182
/dev/sdg1: UUID="98594f17-eae5-45f8-9e90-cd25a8f89442" TYPE="xfs" PARTLABEL="ceph data" 花猫破解版="d7ab9ac1-c68c-4594-b25e-48d3a7cfd182"
#(Depending on how the partitions are created, PARTUUID label is not necessarily present.)

原子加速器vqn-outline

FYI, the first RBD support has been added to LXC commands.

Example :

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# Install LXC 2.0.0 (ubuntu) :
$ add-apt-repository ppa:ubuntu-lxc/lxc-stable
$ apt-get update
$ apt-get install lxc

# Add a ceph pool for lxc bloc devices :
$ ceph osd pool create lxc 64 64

# To create the container, you only need to specify "rbd" backingstore :
$ lxc-create -n ctn1 -B rbd -t debian
/dev/rbd0
debootstrap est /usr/sbin/debootstrap
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Generation complete.
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$ rbd showmapped
id pool image snap device
0  lxc  ctn1  -    /dev/rbd0

$ rbd -p lxc info ctn1
rbd image 'ctn1':
  size 1024 MB in 256 objects
  order 22 (4096 kB objects)
  block_name_prefix: rb.0.1217d.74b0dc51
  format: 1
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$ lxc-start -n ctn1
$ lxc-attach -n ctn1
ctn1$ mount | grep ' / '
/dev/rbd/lxc/ctn1 on / type ext3 (rw,relatime,stripe=1024,data=ordered)
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$ lxc-destroy -n ctn1
Removing image: 100% complete...done.
Destroyed container ctn1
Read on →

花猫破解版

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Since, no more problems :)

The model of the card is a LSI 9207-8i (SAS2308 controler) with IT FW:

lspci | grep LSI
01:00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS2308 PCI-Express Fusion-MPT SAS-2 (rev 05)
Read on →

Recent Posts

  • How Many Mouvement When I Add a Replica ?
  • Dealing With Some Osd Timeouts
  • Erasure Code on Small Clusters
  • Crushmap for 2 DC
  • Change Log Level on the Fly to Ceph Daemons
  • Main New Features in the Latest Versions of Ceph
  • Check OSD Version
  • Find the OSD Location
  • LXC 2.0.0 First Support for Ceph RBD
  • Downgrade LSI 9207 to P19 Firmware
  • Get OMAP Key/value Size
  • The Kernel 4.1 Is Out
  • Add Support of Curl_multi_wait for RadosGW on Debian Wheezy
  • Intel 520 SSD Journal
  • RadosGW Big Index

花猫破解

  • Status updating…
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