Re: active MDS and disk write cache

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Hi Matt,

Can you post your ceph config?  Once you startup your ceph cluster, you
see that linuscs92 is the standby and linuscs95 is the active?  How are
you starting your cluster?

service ceph -a start

and yes linuscs95 comes out as active.


[global]
	; enable secure authentication
;	auth supported = cephx
;	log_to_syslog = true
;	keyring = /etc/ceph/keyring.bin
	; monitors
	;  You need at least one.  You need at least three if you want to
	;  tolerate any node failures.  Always create an odd number.
	journal dio = true
	osd op threads = 24
	osd disk threads = 24
	filestore op threads = 6
	filestore queue max ops = 24

	osd client message size cap = 14000000
	ms dispatch throttle bytes =  17500000

[mon]
	mon data = /vol/disk2/data/mon$id
	; some minimal logging (just message traffic) to aid debugging
;	debug ms = 1

[mon.0]
	host = linuscs92
	mon addr = 10.0.30.10:6789

#[mon.1]
#	host = linuscs93
#	mon addr = 10.0.30.11:6789

[mon.1]
	host = linuscs95
	mon addr = 10.0.30.13:6789

	; mds
	;  You need at least one.  Define two to get a standby.

[mds]
	; where the mds keeps its secret encryption keys
;	keyring = /etc/ceph/keyring.$name

[mds.linuscs92]
	host = linuscs92

[mds.linuscs95]
	host = linuscs95
	mds standby replay = true
	mds standby for name = linuscs92

#[mds.linuscs94]
#    host = linuscs94

	; osd
	;  You need at least one.  Two if you want data to be replicated.
	;  Define as many as you like.

[osd]
	osd journal size = 1024
;	keyring = /etc/ceph/keyring.$name

[osd.0]
	host = linuscs92
	osd data = /vol/disk2/data/osd$id
	osd journal = /vol/disk1/data/osd$id/journal

[osd.1]
	host = linuscs93
	osd data = /vol/disk2/data/osd$id
	osd journal = /vol/disk1/data/osd$id/journal
	
[osd.2]
	host = linuscs94
	osd data = /vol/disk2/data/osd$id
	osd journal = /vol/disk1/data/osd$id/journal
	
[osd.3]
	host = linuscs95
	osd data = /vol/disk2/data/osd$id
	osd journal = /vol/disk1/data/osd$id/journal
	
[osd.4]
	host = linuscs96
	osd data = /vol/disk2/data/osd$id
	osd journal = /vol/disk1/data/osd$id/journal

[osd.5]
	host = linuscs97
	osd data = /vol/disk2/data/osd$id
	osd journal = /vol/disk1/data/osd$id/journal


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