Hi Dan,
When i say multipath i want to say multipath with round robin ;)
On 18/07/13 17:39, Toni F. [ackstorm] wrote:
Hi Dan, thanks for your reply
Yes, as you has said:
"RBD Device /dev/rbd/rbd/iscsi-image-part1 exported with tgt" is
kernel block device and "the TGT-RBD connector" is stgt/tgtd.
My tests was been done exporting it with tgt without multipath. It
seems that are no very big difference in this tests. The real problem
is not that.
I want to use tgt to connect the storage to an ESX but it presents a
few problems.
With kernel block device, i can't use multipath (it turns inestable
and turns a corrupted data)
With stgt/tgtd rbd implementation i can use multipath but the
performance is very poor.
To imaginate the difference, Deploy a VM with 1st (3min) but with 2nd
option (83min).
I hope your understand me. I'm newbie with this concepts.
A lot of thanks
On 16/07/13 04:23, Dan Mick wrote:
Apologies; I don't really understand the results. They're labeled
"RBD Device /dev/rbd/rbd/iscsi-image-part1 exported with tgt" and
"TGT-RBD connector". Is the former nothing to do with tgt (i.e.,
just the kernel block device), and the latter is stgt/tgtd?
Do you interpret them to say the first run gave avg 258MB/s, and the
second run 198MB/s?
On 07/15/2013 02:41 AM, Toni F. [ackstorm] wrote:
Here's my results.
The performance test was seq write
On 15/07/13 10:12, Toni F. [ackstorm] wrote:
I'm going to do a performance test with fio to see the difference.
Regards
On 12/07/13 18:15, Dan Mick wrote:
Ceph performance is a very very complicated subject. How does that
compare to other access methods? Say, rbd import/export for an easy
test?
On Jul 12, 2013 8:22 AM, "Toni F. [ackstorm]"
<toni.fuentes@xxxxxxxxxxx <mailto:toni.fuentes@xxxxxxxxxxx>> wrote:
It works, but the performance is very poor. 100MB/s or less
Which are your performance experience?
Regards
On 12/07/13 13:56, Toni F. [ackstorm] wrote:
It works!
Thanks for all
On 12/07/13 11:23, Toni F. [ackstorm] wrote:
Yes! it seems that i wasn't compiled the rbd support.
System:
State: ready
debug: off
LLDs:
iscsi: ready
Backing stores:
bsg
sg
null
ssc
aio
rdwr (bsoflags sync:direct)
Device types:
disk
cd/dvd
osd
controller
changer
tape
passthrough
iSNS:
iSNS=Off
iSNSServerIP=
iSNSServerPort=3205
iSNSAccessControl=Off
I'm going to recompile it
Thanks a lot!
On 11/07/13 07:45, Dan Mick wrote:
On 07/10/2013 04:12 AM, Toni F. [ackstorm] wrote:
Hi all,
I have installed the v0.37 of tgt.
To test this feature i follow the
http://ceph.com/dev-notes/adding-support-for-rbd-to-stgt/
guide
When i launch the command:
tgtadm --lld iscsi --mode logicalunit --op new
--tid 1 --lun 0
--backing-store iscsi-image --bstype rbd
fails
First i think that lun cannot be 0 because lun 0
is used by the
controller (previous command)
This worked when I first wrote the backend, but tgt
may have changed; I'll investigate and change the
blog entry if so. Thanks.
If i launch the correct command with lun 1 i have
this error:
tgtadm: invalid request
In syslog:
Jul 10 12:54:03 datastore-lnx001 tgtd:
device_mgmt(245) sz:28
params:path=iscsi-image,bstype=rbd
Jul 10 12:54:03 datastore-lnx001 tgtd:
tgt_device_create(532) failed to
find bstype, rbd
What's wrong? not supported?
Where did you get your tgtd? Was it built with rbd
support (CEPH_RBD defined
in the environment for make)?
sudo ./tgtadm --lld iscsi --op show --mode system
should tell you.
How did you set up access to ceph.conf?
--
Toni Fuentes Rico
toni.fuentes@xxxxxxxxxxx <mailto:toni.fuentes@xxxxxxxxxxx>
Administración de Sistemas
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toni.fuentes@xxxxxxxxxxx
Administración de Sistemas
Oficina central: 902 888 345
ACK STORM, S.L.
ISO 9001:2008 (Cert.nº. 536932)
http://ackstorm.es
Este mensaje electrónico contiene información de ACK STORM, S.L.
que es privada y confidencial, siendo para el uso exclusivo de la
persona(s) o entidades arriba mencionadas. Si usted no es el
destinatario señalado, le informamos que cualquier divulgación,
copia, distribución o uso de los contenidos está prohibida. Si
usted ha recibido este mensaje por error, por favor borre su
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--
Toni Fuentes Rico
toni.fuentes@xxxxxxxxxxx
Administración de Sistemas
Oficina central: 902 888 345
ACK STORM, S.L.
ISO 9001:2008 (Cert.nº. 536932)
http://ackstorm.es
Este mensaje electrónico contiene información de ACK STORM, S.L. que
es privada y confidencial, siendo para el uso exclusivo de la
persona(s) o entidades arriba mencionadas. Si usted no es el
destinatario señalado, le informamos que cualquier divulgación,
copia, distribución o uso de los contenidos está prohibida. Si usted
ha recibido este mensaje por error, por favor borre su contenido y
comuníquenoslo en la direcciónackstorm@xxxxxxxxxxx
--
Toni Fuentes Rico
toni.fuentes@xxxxxxxxxxx
Administración de Sistemas
Oficina central: 902 888 345
ACK STORM, S.L.
ISO 9001:2008 (Cert.nº. 536932)
http://ackstorm.es
Este mensaje electrónico contiene información de ACK STORM, S.L. que es privada y confidencial, siendo para el uso exclusivo de la persona(s) o entidades arriba mencionadas. Si usted no es el destinatario señalado, le informamos que cualquier divulgación, copia, distribución o uso de los contenidos está prohibida. Si usted ha recibido este mensaje por error, por favor borre su contenido y comuníquenoslo en la dirección ackstorm@xxxxxxxxxxx
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