From suporte at logicworks.pt Thu May 2 07:49:46 2013 Content-Type: multipart/mixed; boundary="===============5269703570612037277==" MIME-Version: 1.0 From: suporte at logicworks.pt To: users at ovirt.org Subject: Re: [Users] Fault tolerant storage Date: Thu, 02 May 2013 12:49:38 +0100 Message-ID: <9716499.1214.1367495377478.JavaMail.ferra@pc-ferra> In-Reply-To: 518244BD.50303@nbu.cz --===============5269703570612037277== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable ------=3D_Part_1213_14946045.1367495377477 Content-Type: text/plain; charset=3Dutf-8 Content-Transfer-Encoding: 7bit If you use DRDB for that you must be sure that all virtual disks are only i= n one storage domain, and let DRDB mirror them to the other storage domain,= right?. Can we mix 2 iSCSI storage domain with DRDB? for network based rai= d-1. = Jose = ----- Original Message ----- From: "Jakub Bittner" = To: "Gianluca Cecchi" = Cc: users(a)ovirt.org = Sent: Quinta-feira, 2 de Maio de 2013 11:49:33 = Subject: Re: [Users] Fault tolerant storage = Dne 2.5.2013 11:45, Gianluca Cecchi napsal(a): = > On Thu, May 2, 2013 at 11:18 AM, Jakub Bittner wrote: = > = >> To be clear, I know, I can manage fault tolerance by hardware, but it is = >> more expensive = >> = >> _______________________________________________ = >> Users mailing list = >> Users(a)ovirt.org = >> http://lists.ovirt.org/mailman/listinfo/users = > If I understood correctly the initial thread message, Jakub's main = > concern is that if he creates a datacenter, then all storage domains = > have to be of the type initially chosen = > = > Taking from rhev 3.1 docs: = > " = > The type of data domain dictates the type of the = > data center and cannot be changed after creation = > without significant disruption. All storage in a data = > center must be of one type only. For example, if = > iSCSI is selected as the type, only iSCSI data = > domains can be attached to the data center. = > " = > = > So if he would like to put iSCSI and SAN LUNS on the same DC, he can't = > at the moment. = > = > If I remember correctly in another past thread it was said (Itamar = > perhaps?) that there wasn't a particular restriction or design = > constraint about this limitation, but probably only historical = > reason.... is this true? = > = > So it could be cool to put on the roadmap the chance to mix several SD = > types in the same DC. = > = > BTW: Jakub which is the kind of replication / network raid 1 you are = > using or planning, perhaps drbd or similar? = > = > Gianluca = To be honest, I did not know, that datacenter has to have only one type = of storage domain. If so, you are right that it would be cool to mix = several types. (NFS with ISCSI and so) = But my first idea was to connect datacenter with two iSCSI storage = domains and have something like raid 1 over them for fail tolerance = storage ;-) = _______________________________________________ = Users mailing list = Users(a)ovirt.org = http://lists.ovirt.org/mailman/listinfo/users = ------=3D_Part_1213_14946045.1367495377477 Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: quoted-printable <=3D div style=3D3D'font-family: arial,helvetica,sans-serif; font-size: 10pt; co= lo=3D r: #000000'>If you use DRDB for that you must be sure that all virtual disk= =3D s are only in one storage domain, and let DRDB mirror them to the other sto= =3D rage domain, right?. Can we mix 2 iSCSI storage domain with DRDB? for netwo= =3D rk based raid-1.

Jose

From: "= =3D Jakub Bittner" <j.bittner(a)nbu.cz>
To: "Gianluca Cecchi" &= lt=3D ;gianluca.cecchi(a)gmail.com>
Cc: users(a)ovirt.org
Sent= : Quinta-feira, 2 de Maio de 2013 11:49:33
Subject: Re: [Users] F= =3D ault tolerant storage

Dne 2.5.2013 11:45, Gianluca Cecchi napsal(a):= =3D
> On Thu, May 2, 2013 at 11:18 AM, Jakub Bittner wrote:
>
&= =3D gt;> To be clear, I know, I can manage fault tolerance by hardware, but = =3D it is
>> more expensive
>>
>> __________________= =3D _____________________________
>> Users mailing list
>> Us= =3D ers(a)ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users=3D > If I understood correctly the initial thread message, Jakub's main
= =3D > concern is that if he creates a datacenter, then all storage domains> have to be of the type initially chosen
>
> Taking from = =3D rhev 3.1 docs:
> "
> The type of data domain dictates the type = =3D of the
> data center and cannot be changed after creation
> wit= =3D hout significant disruption. All storage in a data
> center must be o= =3D f one type only. For example, if
> iSCSI is selected as the type, onl= =3D y iSCSI data
> domains can be attached to the data center.
> "<= =3D br>>
> So if he would like to put iSCSI and SAN LUNS on the same D= =3D C, he can't
> at the moment.
>
> If I remember correctly = =3D in another past thread it was said (Itamar
> perhaps?) that there was= =3D n't a particular restriction or design
> constraint about this limita= =3D tion, but probably only historical
> reason.... is this true?
>= =3D
> So it could be cool to put on the roadmap the chance to mix severa= =3D l SD
> types in the same DC.
>
> BTW: Jakub which is the = =3D kind of replication / network raid 1 you are
> using or planning, per= =3D haps drbd or similar?
>
> Gianluca

To be honest, I did n= =3D ot know, that datacenter has to have only one type
of storage domain. I= =3D f so, you are right that it would be cool to mix
several types. (NFS wi= =3D th ISCSI and so)

But my first idea was to connect datacenter with tw= =3D o iSCSI storage
domains and have something like raid 1 over them for fa= =3D il tolerance
storage ;-)
___________________________________________= =3D ____
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/m= ai=3D lman/listinfo/users

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