------=_Part_1213_14946045.1367495377477 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit If you use DRDB for that you must be sure that all virtual disks are only in 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 raid-1. Jose ----- Original Message ----- From: "Jakub Bittner" <j.bittner@nbu.cz> To: "Gianluca Cecchi" <gianluca.cecchi@gmail.com> Cc: users@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@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@ovirt.org http://lists.ovirt.org/mailman/listinfo/users ------=_Part_1213_14946045.1367495377477 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <html><head><style type=3D'text/css'>p { margin: 0; }</style></head><body><= div style=3D'font-family: arial,helvetica,sans-serif; font-size: 10pt; colo= r: #000000'>If you use DRDB for that you must be sure that all virtual disk= s are only in one storage domain, and let DRDB mirror them to the other sto= rage domain, right?. Can we mix 2 iSCSI storage domain with DRDB? for netwo= rk based raid-1.<br><br>Jose<br><br><hr id=3D"zwchr"><div style=3D"color: r= gb(0, 0, 0); font-weight: normal; font-style: normal; text-decoration: none= ; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"= Jakub Bittner" <j.bittner@nbu.cz><br><b>To: </b>"Gianluca Cecchi" <= ;gianluca.cecchi@gmail.com><br><b>Cc: </b>users@ovirt.org<br><b>Sent: </= b>Quinta-feira, 2 de Maio de 2013 11:49:33<br><b>Subject: </b>Re: [Users] F= ault tolerant storage<br><br>Dne 2.5.2013 11:45, Gianluca Cecchi napsal(a):= <br>> On Thu, May 2, 2013 at 11:18 AM, Jakub Bittner wrote:<br>><br>&= gt;> To be clear, I know, I can manage fault tolerance by hardware, but = it is<br>>> more expensive<br>>><br>>> __________________= _____________________________<br>>> Users mailing list<br>>> Us= ers@ovirt.org<br>>> http://lists.ovirt.org/mailman/listinfo/users<br>= > If I understood correctly the initial thread message, Jakub's main<br>= > concern is that if he creates a datacenter, then all storage domains<b= r>> have to be of the type initially chosen<br>><br>> Taking from = rhev 3.1 docs:<br>> "<br>> The type of data domain dictates the type = of the<br>> data center and cannot be changed after creation<br>> wit= hout significant disruption. All storage in a data<br>> center must be o= f one type only. For example, if<br>> iSCSI is selected as the type, onl= y iSCSI data<br>> domains can be attached to the data center.<br>> "<= br>><br>> So if he would like to put iSCSI and SAN LUNS on the same D= C, he can't<br>> at the moment.<br>><br>> If I remember correctly = in another past thread it was said (Itamar<br>> perhaps?) that there was= n't a particular restriction or design<br>> constraint about this limita= tion, but probably only historical<br>> reason.... is this true?<br>>= <br>> So it could be cool to put on the roadmap the chance to mix severa= l SD<br>> types in the same DC.<br>><br>> BTW: Jakub which is the = kind of replication / network raid 1 you are<br>> using or planning, per= haps drbd or similar?<br>><br>> Gianluca<br><br>To be honest, I did n= ot know, that datacenter has to have only one type <br>of storage domain. I= f so, you are right that it would be cool to mix <br>several types. (NFS wi= th ISCSI and so)<br><br>But my first idea was to connect datacenter with tw= o iSCSI storage <br>domains and have something like raid 1 over them for fa= il tolerance <br>storage ;-)<br>___________________________________________= ____<br>Users mailing list<br>Users@ovirt.org<br>http://lists.ovirt.org/mai= lman/listinfo/users<br></div><br></div></body></html> ------=_Part_1213_14946045.1367495377477--