Fibre Channel Protocol (FCP)
Hello All, I connected existing data center with NFS storage domain to a new Fiber-Channel storage domain according to the following guide, and I have three questions. https://www.ovirt.org/documentation/install-guide/chap-Configuring_Storage/ 1. why does the storage domain asks me to "Use Host"? - does it mean that if this host is down there is no access to the FC storage or the next available host elected to manage the FC storage? - does it mean that all the traffic to my storage is routed via the selected host? - what is the best practice, do I need to split the workload to other hosts as well by letting each host manage one small LUN instead of letting one host manage all LUNs or one big LUN? 2. is it possible to set the newly created fiber-channel storage(data domain) as master? 3. can I easily migrate all VM disks to the FC storage instead of the NFS? Thank you!
Hello Maoz, i'm serving more than 300 vms in fc setup (and growing). On Thu, Mar 8, 2018 at 12:16 PM, maoz zadok <maozza@gmail.com> wrote:
Hello All, I connected existing data center with NFS storage domain to a new Fiber-Channel storage domain according to the following guide, and I have three questions. https://www.ovirt.org/documentation/install-guide/chap-Configuring_Storage/
1. why does the storage domain asks me to "Use Host"?
Because there are some operations (lvm initialization & so on) to be done while setting up the volumes on FC storage. These operations will be performed by the given host
does it mean that if this host is down there is no access to the FC storage or the next available host elected to manage the FC storage?
No, storage is mapped by all the hosts and accessed directly
does it mean that all the traffic to my storage is routed via the selected host?
Absolutely no!
what is the best practice, do I need to split the workload to other hosts as well by letting each host manage one small LUN instead of letting one host manage all LUNs or one big LUN?
I supposte that your question is related to the way that FC is managed. Since every host sees all the drives, there question is no more appropriate.
2. is it possible to set the newly created fiber-channel storage(data domain) as master?
IIRC if you set to maintenance the existing master, another one will be selected.
3. can I easily migrate all VM disks to the FC storage instead of the NFS?
Sure, nfs storage domain or fc storage domain doesn't make difference in terms of interaction. You can move disks from one to the other without issues. Luca -- "E' assurdo impiegare gli uomini di intelligenza eccellente per fare calcoli che potrebbero essere affidati a chiunque se si usassero delle macchine" Gottfried Wilhelm von Leibnitz, Filosofo e Matematico (1646-1716) "Internet è la più grande biblioteca del mondo. Ma il problema è che i libri sono tutti sparsi sul pavimento" John Allen Paulos, Matematico (1945-vivente) Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , <lorenzetto.luca@gmail.com>
Luca many thanks! that was fast and good! one last thing, how do I migrate to the new data domain? I use oVirt version 4.2.0 Thanks again! On Thu, Mar 8, 2018 at 1:23 PM, Luca 'remix_tj' Lorenzetto < lorenzetto.luca@gmail.com> wrote:
Hello Maoz,
i'm serving more than 300 vms in fc setup (and growing).
On Thu, Mar 8, 2018 at 12:16 PM, maoz zadok <maozza@gmail.com> wrote:
Hello All, I connected existing data center with NFS storage domain to a new Fiber-Channel storage domain according to the following guide, and I have three questions. https://www.ovirt.org/documentation/install-guide/ chap-Configuring_Storage/
1. why does the storage domain asks me to "Use Host"?
Because there are some operations (lvm initialization & so on) to be done while setting up the volumes on FC storage. These operations will be performed by the given host
does it mean that if this host is down there is no access to the FC
storage
or the next available host elected to manage the FC storage?
No, storage is mapped by all the hosts and accessed directly
does it mean that all the traffic to my storage is routed via the selected host?
Absolutely no!
what is the best practice, do I need to split the workload to other hosts as well by letting each host manage one small LUN instead of letting one host manage all LUNs or one big LUN?
I supposte that your question is related to the way that FC is managed. Since every host sees all the drives, there question is no more appropriate.
2. is it possible to set the newly created fiber-channel storage(data domain) as master?
IIRC if you set to maintenance the existing master, another one will be selected.
3. can I easily migrate all VM disks to the FC storage instead of the
NFS?
Sure, nfs storage domain or fc storage domain doesn't make difference in terms of interaction. You can move disks from one to the other without issues.
Luca
-- "E' assurdo impiegare gli uomini di intelligenza eccellente per fare calcoli che potrebbero essere affidati a chiunque se si usassero delle macchine" Gottfried Wilhelm von Leibnitz, Filosofo e Matematico (1646-1716)
"Internet è la più grande biblioteca del mondo. Ma il problema è che i libri sono tutti sparsi sul pavimento" John Allen Paulos, Matematico (1945-vivente)
Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , < lorenzetto.luca@gmail.com>
On Thu, Mar 8, 2018 at 12:34 PM, maoz zadok <maozza@gmail.com> wrote:
Luca many thanks! that was fast and good! one last thing, how do I migrate to the new data domain? I use oVirt version 4.2.0 Thanks again!
Hello, you select the vm disks you want to move and with the right click you select the menù entry "Move". You'll get a windows asking for the destination storage domain. Once set the values, you confirm and disk will be moved. https://www.ovirt.org/documentation/admin-guide/chap-Virtual_Machine_Disks/#... Luca -- "E' assurdo impiegare gli uomini di intelligenza eccellente per fare calcoli che potrebbero essere affidati a chiunque se si usassero delle macchine" Gottfried Wilhelm von Leibnitz, Filosofo e Matematico (1646-1716) "Internet è la più grande biblioteca del mondo. Ma il problema è che i libri sono tutti sparsi sul pavimento" John Allen Paulos, Matematico (1945-vivente) Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , <lorenzetto.luca@gmail.com>
it works! thank you!😀 On Thu, Mar 8, 2018 at 1:38 PM, Luca 'remix_tj' Lorenzetto < lorenzetto.luca@gmail.com> wrote:
On Thu, Mar 8, 2018 at 12:34 PM, maoz zadok <maozza@gmail.com> wrote:
Luca many thanks! that was fast and good! one last thing, how do I migrate to the new data domain? I use oVirt version 4.2.0 Thanks again!
Hello,
you select the vm disks you want to move and with the right click you select the menù entry "Move". You'll get a windows asking for the destination storage domain.
Once set the values, you confirm and disk will be moved.
https://www.ovirt.org/documentation/admin-guide/ chap-Virtual_Machine_Disks/#moving-a-virtual-disk
Luca
-- "E' assurdo impiegare gli uomini di intelligenza eccellente per fare calcoli che potrebbero essere affidati a chiunque se si usassero delle macchine" Gottfried Wilhelm von Leibnitz, Filosofo e Matematico (1646-1716)
"Internet è la più grande biblioteca del mondo. Ma il problema è che i libri sono tutti sparsi sul pavimento" John Allen Paulos, Matematico (1945-vivente)
Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , < lorenzetto.luca@gmail.com>
participants (2)
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Luca 'remix_tj' Lorenzetto -
maoz zadok