On 03/27/2013 07:17 PM, [email protected] wrote: > Hi guys, im new to the list, and i apologise in advance to write this, > but i've been reading a lot and i dont seem to find an answer to an > specific question i have. > > We are using Netapp to deploy nova volume to our openstack KVM > instances, this means : > > #1 We have lots of phisical servers running kvm virtual instances > #2 this physical servers connect against our netapp appliances through iSCSI > #3 we attach this iscsi sessions to the instances for them to see it as > a new block device ( the instances dont see it as an scsi session, just > the phisical server ) > > The thing is, we want to be able to handle a 1 minute disconnection > caused either by a storage reboot or a network outage ( both, no more > than a minute o minute and a half )
What do you mean by handle? Retried in the iscsi/scsi layer? Failed to upper levels like multipath or some clustering software? Are you using dm-multipath with iscsi? Section 8. Advanced Configuration of the iscsi README might be helpful. > What i want to understand and i dont seem to ( again, sorry ) is ... > Tell me if you are using dm-multipath and what you want to do. I can then answer the questions below. > #1 what parameter/s to touch from the open-iscsi config on the physical > host to handle that amount of time the dissconection > #2 in the mean time, supposing i've touched thos parameters, all the > data that needs to be writen and wont, were is it cached on the physical > server side? in ram ? in our local disk ? > #3 and those retries, i imagine i will see exactly the same in the > physical and virtual side, are reflected till the connection is > reestablished, as I/O wait just increasing, and CPU waiting for the > write to finish ? > > Hope i made myself clear, and sorri if all my questions were answered > and i wasnt able to find it. > I'll wait for all your help to understand a little more. > > Thank you very much. > > -- > You received this message because you are subscribed to the Google > Groups "open-iscsi" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/open-iscsi?hl=en. > For more options, visit https://groups.google.com/groups/opt_out. > > -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/open-iscsi?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
