Hi,
You can refer to a thread "Odd WAL traffic for BlueStore" in devel list for
your questions.
This traffic is mostly observed on wal partition of bluestore, which is used by
rocksdb. Above thread should give more insight to your questions.
Varada
On Tuesday 23 August 2016 12:09 PM, Zhiyuan Wang wrote:
Hi
I have test bluestore on SSD, and I found that the BW from fio is about 40MB,
but
the write BW from iostat of SSD is about 400MB, nearly ten times.
Could someone help to explain this?
Thanks a lot.
Below are my configuration file:
[global]
fsid = 31e77e3c-447c-4745-a91a-58bda80a868c
enable experimental unrecoverable data corrupting features = bluestore
rocksdb
osd objectstore = bluestore
bluestore default buffered read = true
bluestore_min_alloc_size=4096
osd pool default size = 1
osd pg bits = 8
osd pgp bits = 8
auth supported = none
log to syslog = false
filestore xattr use omap = true
auth cluster required = none
auth service required = none
auth client required = none
public network = 192.168.200.233/24
cluster network = 192.168.100.233/24
mon initial members = node3
mon host = 192.168.200.233
mon data = /etc/ceph/mon.node3
filestore merge threshold = 40
filestore split multiple = 8
osd op threads = 8
debug_bluefs = "0/0"
debug_bluestore = "0/0"
debug_bdev = "0/0"
debug_lockdep = "0/0"
debug_context = "0/0"
debug_crush = "0/0"
debug_mds = "0/0"
debug_mds_balancer = "0/0"
debug_mds_locker = "0/0"
debug_mds_log = "0/0"
debug_mds_log_expire = "0/0"
debug_mds_migrator = "0/0"
debug_buffer = "0/0"
debug_timer = "0/0"
debug_filer = "0/0"
debug_objecter = "0/0"
debug_rados = "0/0"
debug_rbd = "0/0"
debug_journaler = "0/0"
debug_objectcacher = "0/0"
debug_client = "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_mon = "0/0"
debug_monc = "0/0"
debug_paxos = "0/0"
debug_tp = "0/0"
debug_auth = "0/0"
debug_finisher = "0/0"
debug_heartbeatmap = "0/0"
debug_perfcounter = "0/0"
debug_rgw = "0/0"
debug_hadoop = "0/0"
debug_asok = "0/0"
debug_throttle = "0/0"
[osd.0]
host = node3
osd data = /etc/ceph/osd-device-0-data
bluestore block path = /dev/disk/by-partlabel/osd-device-0-block
bluestore block db path = /dev/disk/by-partlabel/osd-device-0-db
bluestore block wal path = /dev/disk/by-partlabel/osd-device-0-wal
[osd.1]
host = node3
osd data = /etc/ceph/osd-device-1-data
bluestore block path = /dev/disk/by-partlabel/osd-device-1-block
bluestore block db path = /dev/disk/by-partlabel/osd-device-1-db
bluestore block wal path = /dev/disk/by-partlabel/osd-device-1-wal
[osd.2]
host = node3
osd data = /etc/ceph/osd-device-2-data
bluestore block path = /dev/disk/by-partlabel/osd-device-2-block
bluestore block db path = /dev/disk/by-partlabel/osd-device-2-db
bluestore block wal path = /dev/disk/by-partlabel/osd-device-2-wal
[osd.3]
host = node3
osd data = /etc/ceph/osd-device-3-data
bluestore block path = /dev/disk/by-partlabel/osd-device-3-block
bluestore block db path = /dev/disk/by-partlabel/osd-device-3-db
bluestore block wal path = /dev/disk/by-partlabel/osd-device-3-wal
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