Hi All,
I am trying to configure rocksdb as objectstore backend on a cluster
with ceph version 0.91-375-g2a4cbfc. I built ceph using' make-debs.sh'
which builds the source with --with-rocksdb option. I was able to get
the cluster up and running with rockdbs as a backend, however as soon
as I started dumping data on cluster using radosbench , cluster become
miserable just after 10 sec of write I/Os. Some OSD daemons marked
down randomly for no apparent reason. Even if I make all daemons
start/up again , after some time some daemons marked down again
randomly.Recovery i/o does the job this time , that external i/o done
before. What could be the possible problem and solution for this
behaviour?
Some more details:
1. Setup is 3 OSD nodes with 10 SanDisk Optimus Eco (400GB)
each.Drives were working fine with filestore backend.
2. 3 Monitors and 1 client from which I am running RadosBench.
3. Ubuntu14.04 on each node. (3.13.0-24-generic)
4. I create OSDs on each nodes using below script(of course with
different osd numbers):-
##################################
#!/bin/bash
sudo stop ceph-osd-all
ps -eaf|grep osd |awk '{print $2}'|xargs sudo kill -9
osd_num=(0 1 2 3 4 5 6 7 8 9)
drives=(sdb1 sdc1 sdd1 sde1 sdf1 sdg1 sdh1 sdi1 sdj1 sdk1)
node="rack6-storage-1"
for ((i=0;i<10;i++))
do
sudo ceph osd rm ${osd_num[i]}
sudo ceph osd crush rm osd.${osd_num[i]}
sudo ceph auth del osd.${osd_num[i]}
sudo umount -f /var/lib/ceph/osd/ceph-${osd_num[i]}
ceph osd create
sudo rm -rf /var/lib/ceph/osd/ceph-${osd_num[i]}
sudo mkdir -p /var/lib/ceph/osd/ceph-${osd_num[i]}
sudo mkfs.xfs -f -i size=2048 /dev/${drives[i]}
sudo mount -o rw,noatime,inode64,logbsize=256k,delaylog
/dev/${drives[i]} /var/lib/ceph/osd/ceph-${osd_num[i]}
sudo ceph osd crush add osd.${osd_num[i]} 1 root=default host=$node
sudo sudo ceph-osd --id ${osd_num[i]} -d --mkkey --mkfs
--osd-data /var/lib/ceph/osd/ceph-${osd_num[i]}
ceph auth add osd.${osd_num[i]} osd 'allow *' mon 'allow
profile osd' -i /var/lib/ceph/osd/ceph-${osd_num[i]}/keyring
sudo sudo ceph-osd -i ${osd_num[i]}
done
###################################
5. Some configs that might be relevant are as follows:-
#########
enable_experimental_unrecoverable_data_corrupting_features = keyvaluestore
osd_objectstore = keyvaluestore
keyvaluestore_backend = rocksdb
keyvaluestore queue max ops = 500
keyvaluestore queue max bytes = 100
keyvaluestore header cache size = 2048
keyvaluestore op threads = 10
keyvaluestore_max_expected_write_size = 4096000
leveldb_write_buffer_size = 33554432
leveldb_cache_size = 536870912
leveldb_bloom_size = 0
leveldb_max_open_files = 10240
leveldb_compression = false
leveldb_paranoid = false
leveldb_log = /dev/null
leveldb_compact_on_mount = false
rocksdb_write_buffer_size = 33554432
rocksdb_cache_size = 536870912
rocksdb_bloom_size = 0
rocksdb_max_open_files = 10240
rocksdb_compression = false
rocksdb_paranoid = false
rocksdb_log = /dev/null
rocksdb_compact_on_mount = false
#########
6. Objects get stored in *.sst files, seems rocksbd is configured correctly:-
ls -l /var/lib/ceph/osd/ceph-20/current/ |more
total 3169352
-rw-r--r-- 1 root root 2128430 Jan 20 00:04 000031.sst
-rw-r--r-- 1 root root 2128430 Jan 20 00:04 000033.sst
-rw-r--r-- 1 root root 2128431 Jan 20 00:04 000035.sst
............
7. This is current state of cluster:-
################
monmap e1: 3 mons at
{rack6-ramp-1=10.x.x.x:6789/0,rack6-ramp-2=10.x.x.x:6789/0,rack6-ramp-3=10.x.x.x:6789/0}
election epoch 16, quorum 0,1,2 rack6-ramp-1,rack6-ramp-2,rack6-ramp-3
osdmap e547: 30 osds: 8 up, 8 in
pgmap v1059: 512 pgs, 1 pools, 18252 MB data, 4563 objects
22856 MB used, 2912 GB / 2934 GB avail
1587/13689 objects degraded (11.593%)
419/13689 objects misplaced (3.061%)
26/4563 unfound (0.570%)
#################
I would be happy to provide any other information that is needed.
--
-Pushpesh
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