Hi all,
I have very slow IO operations on my cluster when i stop a node for
maintenance.
I know my cluster can support the charge with only 2 on my 4 nodes.
I set the noout flag with "ceph osd set noout"
From my understanding, stop only one CEPH node should not have big issue.
BUT when i down the node :
* I see some pg move to active+degraded, this is normal i presume.
* The load of my VM massively increases, the IO wait too.
* Some VM become unusable
What's the best solution to do a maintenance on my node without
interuption on service?
My cluster :
* 4 nodes & 3 monitors
* 9 OSD by node = 36 OSD
* 3 SSD on each node to store journal (1SSD to 3 OSD)
* 2 pools : images (202 PG) & volumes (822 PG) for 1024pg (we have to
increase pg to 2048)
* Average 2000 IOPS
My ceph.conf :
[global]
fsid = a4f460da-ec6e-459a-afb7-cddd565d131d
mon_initial_members = gontran,donald,lugia
mon_host = 172.28.0.8,172.28.0.9,172.28.0.7
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
filestore_xattr_use_omap = true
osd_pool_default_size = 3 # Write an object 3 times.
osd_pool_default_min_size = 1 # Allow writing one copy in a degraded state.
osd_pool_default_pg_num = 200
osd_pool_default_pgp_num = 200
osd_recovery_op_priority = 2
osd_max_backfills = 1
osd_recovery_max_active = 1
# Disable debug to increase IOPS
debug lockdep = 0/0
debug context = 0/0
debug crush = 0/0
debug buffer = 0/0
debug timer = 0/0
debug journaler = 0/0
debug osd = 0/0
debug optracker = 0/0
debug objclass = 0/0
debug filestore = 0/0
debug journal = 0/0
debug ms = 0/0
debug monc = 0/0
debug tp = 0/0
debug auth = 0/0
debug finisher = 0/0
debug heartbeatmap = 0/0
debug perfcounter = 0/0
debug asok = 0/0
debug throttle = 0/0
[mon]
mon host = gontran,donald,lugia
mon addr = 172.28.0.8:6789,172.28.0.9:6789,172.28.0.7:6789
mon warn on legacy crush tunables = false
debug lockdep = 0/0
debug context = 0/0
debug crush = 0/0
debug buffer = 0/0
debug timer = 0/0
debug journaler = 0/0
debug osd = 0/0
debug optracker = 0/0
debug objclass = 0/0
debug filestore = 0/0
debug journal = 0/0
debug ms = 0/0
debug monc = 0/0
debug tp = 0/0
debug auth = 0/0
debug finisher = 0/0
debug heartbeatmap = 0/0
debug perfcounter = 0/0
debug asok = 0/0
debug throttle = 0/0
[osd]
osd_mkfs_type = xfs
osd_filestore_xattr_use_omap = true
osd_journal_size = 10000
debug lockdep = 0/0
debug context = 0/0
debug crush = 0/0
debug buffer = 0/0
debug timer = 0/0
debug journaler = 0/0
debug osd = 0/0
debug optracker = 0/0
debug objclass = 0/0
debug filestore = 0/0
debug journal = 0/0
debug ms = 0/0
debug monc = 0/0
debug tp = 0/0
debug auth = 0/0
debug finisher = 0/0
debug heartbeatmap = 0/0
debug perfcounter = 0/0
debug asok = 0/0
debug throttle = 0/0
[osd.0]
host = gontran
devs = /dev/sda3
journal = /dev/sdj
[osd.1]
host = gontran
devs = /dev/sdb3
journal = /dev/sdj
[osd.2]
host = gontran
devs = /dev/sdc3
journal = /dev/sdj
[osd.3]
host = gontran
devs = /dev/sdd3
journal = /dev/sdk
[osd.4]
host = gontran
devs = /dev/sde3
journal = /dev/sdk
[osd.5]
host = gontran
devs = /dev/sdf3
journal = /dev/sdk
[osd.6]
host = gontran
devs = /dev/sdg3
journal = /dev/sdl
[osd.7]
host = gontran
devs = /dev/sdh3
journal = /dev/sdl
[osd.8]
host = gontran
devs = /dev/sdi3
journal = /dev/sdl
[osd.9]
host = donald
devs = /dev/sda4
journal = /dev/sdj
[osd.10]
host = donald
devs = /dev/sdb4
journal = /dev/sdj
[osd.11]
host = donald
devs = /dev/sdc4
journal = /dev/sdj
[osd.12]
host = donald
devs = /dev/sdd4
journal = /dev/sdk
[osd.13]
host = donald
devs = /dev/sde4
journal = /dev/sdk
[osd.14]
host = donald
devs = /dev/sdf4
journal = /dev/sdk
[osd.15]
host = donald
devs = /dev/sdg4
journal = /dev/sdl
[osd.16]
host = donald
devs = /dev/sdh4
journal = /dev/sdl
[osd.17]
host = donald
devs = /dev/sdi4
journal = /dev/sdl
[osd.18]
host = popop
devs = /dev/sda4
journal = /dev/sdj
[osd.19]
host = popop
devs = /dev/sdb4
journal = /dev/sdj
[osd.20]
host = popop
devs = /dev/sdc4
journal = /dev/sdj
[osd.21]
host = popop
devs = /dev/sdd4
journal = /dev/sdk
[osd.22]
host = popop
devs = /dev/sde4
journal = /dev/sdk
[osd.23]
host = popop
devs = /dev/sdf4
journal = /dev/sdk
[osd.24]
host = popop
devs = /dev/sdg4
journal = /dev/sdl
[osd.25]
host = popop
devs = /dev/sdh4
journal = /dev/sdl
[osd.26]
host = popop
devs = /dev/sdi4
journal = /dev/sdl
[osd.27]
host = daisy
devs = /dev/sda4
journal = /dev/sdj
[osd.28]
host = daisy
devs = /dev/sdb4
journal = /dev/sdj
[osd.29]
host = daisy
devs = /dev/sdc4
journal = /dev/sdj
[osd.30]
host = daisy
devs = /dev/sdd4
journal = /dev/sdk
[osd.31]
host = daisy
devs = /dev/sde4
journal = /dev/sdk
[osd.32]
host = daisy
devs = /dev/sdf4
journal = /dev/sdk
[osd.33]
host = daisy
devs = /dev/sdg4
journal = /dev/sdl
[osd.34]
host = daisy
devs = /dev/sdh4
journal = /dev/sdl
[osd.35]
host = daisy
devs = /dev/sdi4
journal = /dev/sdl
ceph -s
[root at gontran.ovh:~] # ceph -s
cluster a4f460da-ec6e-459a-afb7-cddd565d131d
health HEALTH_WARN noscrub,nodeep-scrub flag(s) set
monmap e13: 3 mons at
{donald=172.28.0.9:6789/0,gontran=172.28.0.8:6789/0,lugia=172.28.0.7:6789/0},
election epoch 56040, quorum 0,1,2 lugia,gontran,donald
osdmap e11058: 36 osds: 36 up, 36 in
flags noscrub,nodeep-scrub
pgmap v11009904: 1024 pgs, 2 pools, 5467 GB data, 1331 kobjects
16387 GB used, 114 TB / 130 TB avail
1024 active+clean
client io 1712 kB/s wr, 231 op/s
Thanks you!
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