Is there a reason why NFS cannot be region-wide? -Syed
On Tue, Jul 19, 2016 at 2:08 PM, Nux! <n...@li.nux.ro> wrote: > Thanks for your input guys. > > I think I'll stay with NFS for now after your replies, but it'd be pretty > sweet the day when we'll be having region wide secondary storage. > > I'll need to think of another way to provide DR, perhaps some automatic > snapshot+download of sorts. > > Lucian > > -- > Sent from the Delta quadrant using Borg technology! > > Nux! > www.nux.ro > > ----- Original Message ----- > > From: "Syed Ahmed" <sah...@cloudops.com> > > To: dev@cloudstack.apache.org > > Cc: "Nux!" <n...@li.nux.ro>, "Cloudstack Users List" < > us...@cloudstack.apache.org> > > Sent: Tuesday, 19 July, 2016 17:06:52 > > Subject: Re: State of the S3 secondary storage > > > As Will put it, the implementation for using Object store as secondary > > storage relies on using Staging NFS. You would also loose the > functionality > > to do differential snapshots. All your snapshots will basically be full > > volume snapshots. So, if you have a lot of snapshots being taken at > > scheduled intervals, you might end up with wasting a lot of space on your > > S3. Not to mention all of this has to go through the NFS which can (an in > > our experience has) fill up preventing you from creating new VMs (because > > templates cannot be downloaded). However you do benefit from a region > wide > > Image store. We've worked around the NFS problem by basically having > > multiple staging NFS stores. > > > > I have plans to make Object stores better integrated in Cloudstack. The > > holy grail would be to avoid staging NFS completely (or atleast in the > > upload path). But for now we have to live with the limitations. > > > > -Syed > > > > > > On Tue, Jul 19, 2016 at 11:41 AM, Will Stevens <wstev...@cloudops.com> > > wrote: > > > >> We are using Swift as secondary storage. It also offers inter-zone > >> secondary storage. We have had to do fixes to make it work correctly, > but > >> we have pushed those fixes upstream so they are available in 4.9 (and > some > >> fixes earlier than that). > >> > >> Like Wido said, the staging NFS is still needed which is a real problem > >> with these implementations. You end up copying the data many times and > you > >> will run into problems if you have lots of customers doing scheduled > >> snapshots at the same time because you can fill your NFS staging area > >> unless you give it a lot of space to work with. > >> > >> The object storage integrations are working, but they are not designed > very > >> well at present. You have code for both S3 and Swift basically just > >> separated with conditionals and much of the logic is shared. This is > very > >> brittle because making changes in one integration can (and historically > >> has) broken the other implementation. This is a relatively big problem > >> because most people working with either Swift or S3 will only have the > >> ability to test one of them, so they don't really have the ability to > test > >> if they have broken the other. It does not help that there is Zero CI > >> coverage run for either the Swift or S3 integrations due to the > difficulty > >> building and tearing down object storage environments on the fly. > >> > >> All in all, yes they should be working, but expect a bit of a bumpy > road. > >> > >> Hope that helps, > >> > >> *Will STEVENS* > >> Lead Developer > >> > >> *CloudOps* *| *Cloud Solutions Experts > >> 420 rue Guy *|* Montreal *|* Quebec *|* H3J 1S6 > >> w cloudops.com *|* tw @CloudOps_ > >> > >> On Tue, Jul 19, 2016 at 11:26 AM, Wido den Hollander <w...@widodh.nl> > >> wrote: > >> > >> > > >> > > Op 19 juli 2016 om 14:38 schreef Nux! <n...@li.nux.ro>: > >> > > > >> > > > >> > > Hello, > >> > > > >> > > Could anyone summarise the state of S3 (and clones) for secondary > >> > storage? > >> > > I read at some point that it's the only secondary storage type > >> supported > >> > inter-zone, so it would appeal from a DR pov, but not sure how mature > it > >> is > >> > or if there are any serious gotchas involved. > >> > > > >> > > >> > We have it running for our largest region (Amsterdam) with Ceph's > RADOS > >> > Gateway as backend. We had some issues, but they seem to be fixed > after > >> our > >> > latest patches. > >> > > >> > You still need the staging NFS though, so that doesn't solve anything. > >> > > >> > Wido > >> > > >> > > Thanks > >> > > Lucian > >> > > > >> > > -- > >> > > Sent from the Delta quadrant using Borg technology! > >> > > > >> > > Nux! > >> > > www.nux.ro > >> > >
