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open source ha san

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erkrishna at gmail

Nov 2, 2009, 8:57 PM

Post #1 of 6 (1178 views)
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open source ha san

Dear All,

I have written a article with complete how to which describes following
things :

Making of open source HA SAN :

An article which describes and making of HA SAN with AoE, heartbeat and
DRBD. I mean it contains a complete how to of integration of DRBD, heartbeat
and AoE targets and initiators.

I want to keep it on the DRBD website. Can anybody help me to review it and
putting it on DRBD site.

Thanks and Best regards,
Krishna

lars.ellenberg at linbit

Nov 3, 2009, 3:40 AM

Post #2 of 6 (1115 views)
Permalink

Re: open source ha san [In reply to]

On Tue, Nov 03, 2009 at 10:27:34AM +0530, er krishna wrote:
> Dear All,
>
> I have written a article with complete how to which describes following
> things :
>
> Making of open source HA SAN :
>
> An article which describes and making of HA SAN with AoE, heartbeat and
> DRBD. I mean it contains a complete how to of integration of DRBD, heartbeat
> and AoE targets and initiators.
>
> I want to keep it on the DRBD website. Can anybody help me to review it and
> putting it on DRBD site.

Sure.
Feel free to post a link (preferred),
or post to the list (if not serveral megabytes),
or send with private mail.

Thanks,

--
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

DRBDŽ and LINBITŽ are registered trademarks of LINBIT, Austria.
__
please don't Cc me, but send to list -- I'm subscribed
_______________________________________________
drbd-user mailing list
drbd-user [at] lists
http://lists.linbit.com/mailman/listinfo/drbd-user

erkrishna at gmail

Nov 3, 2009, 9:01 PM

Post #3 of 6 (1090 views)
Permalink

Re: open source ha san [In reply to]

Dear Lars,

Please find my how to of HA SAN. I am attaching the how to & patches and
the purpose is as follows:

1) The patch fixes a bug of AoE driver [. if on client side the target is
dead, even it shows the files in mounted directory ]. If you dont apply this
patch then you won't have this feature in AoE driver.

2) How to : My how to explains the integration of AoE + DRBD + Heartbeat.
There are three nodes, one node is client & two nodes are servers. The
client uses AoE service (exported block device) from the primary node and if
the primary node fails, AoE service will be started on secondary node. The
client won't feel any disturbance in case of failover.

Lars,

I have two seperate document regarding all available AoE targets ( their how
to) , description, integration (with DRBD & Heartbeat) and their complete
design. If you would like to keep those documents also on DRBD site after
your review, then please let me know.

Thanks & Best Regards,
Krishna

On Tue, Nov 3, 2009 at 5:10 PM, Lars Ellenberg <lars.ellenberg [at] linbit>wrote:

> On Tue, Nov 03, 2009 at 10:27:34AM +0530, er krishna wrote:
> > Dear All,
> >
> > I have written a article with complete how to which describes following
> > things :
> >
> > Making of open source HA SAN :
> >
> > An article which describes and making of HA SAN with AoE, heartbeat and
> > DRBD. I mean it contains a complete how to of integration of DRBD,
> heartbeat
> > and AoE targets and initiators.
> >
> > I want to keep it on the DRBD website. Can anybody help me to review it
> and
> > putting it on DRBD site.
>
> Sure.
> Feel free to post a link (preferred),
> or post to the list (if not serveral megabytes),
> or send with private mail.
>
> Thanks,
>
> --
> : Lars Ellenberg
> : LINBIT | Your Way to High Availability
> : DRBD/HA support and consulting http://www.linbit.com
>
> DRBDŽ and LINBITŽ are registered trademarks of LINBIT, Austria.
> __
> please don't Cc me, but send to list -- I'm subscribed
> _______________________________________________
> drbd-user mailing list
> drbd-user [at] lists
> http://lists.linbit.com/mailman/listinfo/drbd-user
>

Attachments:

kernelpatch (0.79 KB)

patch_aoe (2.28 KB)

aoe-init.sh (1.86 KB)

HAOVERSAN.pdf (66.1 KB)

ha_san_raid_lvm_aoe.pdf (66.2 KB)

erkrishna at gmail

Nov 16, 2009, 8:11 AM

Post #4 of 6 (987 views)
Permalink

Re: open source ha san [In reply to]

Dear Lars,

Please tell if you like the design and you are thinking to put it on your
site. I have some detail design other documents also which I want to put on
DRBD site.

Best Regards,
Krishna

On Wed, Nov 4, 2009 at 10:31 AM, er krishna <erkrishna [at] gmail> wrote:

> Dear Lars,
>
> Please find my how to of HA SAN. I am attaching the how to & patches and
> the purpose is as follows:
>
> 1) The patch fixes a bug of AoE driver [. if on client side the target is
> dead, even it shows the files in mounted directory ]. If you dont apply this
> patch then you won't have this feature in AoE driver.
>
> 2) How to : My how to explains the integration of AoE + DRBD + Heartbeat.
> There are three nodes, one node is client & two nodes are servers. The
> client uses AoE service (exported block device) from the primary node and if
> the primary node fails, AoE service will be started on secondary node. The
> client won't feel any disturbance in case of failover.
>
>
>
>
> Lars,
>
> I have two seperate document regarding all available AoE targets ( their
> how to) , description, integration (with DRBD & Heartbeat) and their
> complete design. If you would like to keep those documents also on DRBD site
> after your review, then please let me know.
>
>
>
> Thanks & Best Regards,
> Krishna
>
> On Tue, Nov 3, 2009 at 5:10 PM, Lars Ellenberg <lars.ellenberg [at] linbit>wrote:
>
>> On Tue, Nov 03, 2009 at 10:27:34AM +0530, er krishna wrote:
>> > Dear All,
>> >
>> > I have written a article with complete how to which describes following
>> > things :
>> >
>> > Making of open source HA SAN :
>> >
>> > An article which describes and making of HA SAN with AoE, heartbeat and
>> > DRBD. I mean it contains a complete how to of integration of DRBD,
>> heartbeat
>> > and AoE targets and initiators.
>> >
>> > I want to keep it on the DRBD website. Can anybody help me to review it
>> and
>> > putting it on DRBD site.
>>
>> Sure.
>> Feel free to post a link (preferred),
>> or post to the list (if not serveral megabytes),
>> or send with private mail.
>>
>> Thanks,
>>
>> --
>> : Lars Ellenberg
>> : LINBIT | Your Way to High Availability
>> : DRBD/HA support and consulting http://www.linbit.com
>>
>> DRBDŽ and LINBITŽ are registered trademarks of LINBIT, Austria.
>> __
>> please don't Cc me, but send to list -- I'm subscribed
>> _______________________________________________
>> drbd-user mailing list
>> drbd-user [at] lists
>> http://lists.linbit.com/mailman/listinfo/drbd-user
>>
>
>

philipp.reisner at linbit

Nov 16, 2009, 9:02 AM

Post #5 of 6 (998 views)
Permalink

Re: open source ha san [In reply to]

Am Montag, 16. November 2009 17:11:00 schrieb er krishna:
> Dear Lars,
>
> Please tell if you like the design and you are thinking to put it on your
> site. I have some detail design other documents also which I want to put on
> DRBD site.
>
> Best Regards,
> Krishna
>

Hi Krishna,

It is not only about the design, it is more about the content of your
papers. There are a number of errors in the "ha_san_raid_lvm_aoe.pdf"
document:

*) Never put meta data on a loop device. It might deadlock under
memory pressure.
*) No need to create the file system on top of DRBD twice. Once
on each node!!
*) I got the impression you advise to mount an ext3 fs on the
secondary (ro). This has a severe cache coherency issue, and
should not be advised to anyone.

The kernel patch simply drops all caches on the initiator side,
which is rude in a way.

Sorry, but I do not want to have this on .drbd.org as it is.

-Phil
--
: Dipl-Ing Philipp Reisner
: LINBIT | Your Way to High Availability
: Tel: +43-1-8178292-50, Fax: +43-1-8178292-82
: http://www.linbit.com

DRBD(R) and LINBIT(R) are registered trademarks of LINBIT, Austria.
_______________________________________________
drbd-user mailing list
drbd-user [at] lists
http://lists.linbit.com/mailman/listinfo/drbd-user

erkrishna at gmail

Nov 16, 2009, 7:45 PM

Post #6 of 6 (973 views)
Permalink

Re: open source ha san [In reply to]

Dear Philip,

Thanks a lot for reviewing and telling me about the errors. I will try to
modify according to your suggestion and let you know after this.

Best Regards,
Krishna

On Mon, Nov 16, 2009 at 10:32 PM, Philipp Reisner <
philipp.reisner [at] linbit> wrote:

> Am Montag, 16. November 2009 17:11:00 schrieb er krishna:
> > Dear Lars,
> >
> > Please tell if you like the design and you are thinking to put it on your
> > site. I have some detail design other documents also which I want to put
> on
> > DRBD site.
> >
> > Best Regards,
> > Krishna
> >
>
>
> Hi Krishna,
>
> It is not only about the design, it is more about the content of your
> papers. There are a number of errors in the "ha_san_raid_lvm_aoe.pdf"
> document:
>
> *) Never put meta data on a loop device. It might deadlock under
> memory pressure.
> *) No need to create the file system on top of DRBD twice. Once
> on each node!!
> *) I got the impression you advise to mount an ext3 fs on the
> secondary (ro). This has a severe cache coherency issue, and
> should not be advised to anyone.
>
> The kernel patch simply drops all caches on the initiator side,
> which is rude in a way.
>
> Sorry, but I do not want to have this on .drbd.org as it is.
>
> -Phil
> --
> : Dipl-Ing Philipp Reisner
> : LINBIT | Your Way to High Availability
> : Tel: +43-1-8178292-50, Fax: +43-1-8178292-82
> : http://www.linbit.com
>
> DRBD(R) and LINBIT(R) are registered trademarks of LINBIT, Austria.
>

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