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.

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/

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
}

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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.

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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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)

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

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花猫破解

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.)

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

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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)