cloudstack-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Mike Tutkowski <mike.tutkow...@solidfire.com>
Subject Re: S3/Swift Problem around Virtual Size
Date Tue, 09 Sep 2014 05:41:13 GMT
Great :) Then a question might be, "Is it too late in the game to
interrogate the template to discover its virtual size if we're just about
to copy the template to primary storage?"

If it's not, this might be the place to run the logic to figure out the
virtual size.

Really, there are three big possibilities:

1) Just ask the end user to provide the virtual size (not commenting here
on what happens for already-uploaded templates)

or

2) Figure out the virtual size when the template is copied from object
storage to secondary storage and update the DB with this info (not sure
what happens if the template has already been copied to (secondary-storage)
NFS because it was used before)

or

3) Figure out the virtual size when the template is about to be copied from
secondary storage to primary storage

On Mon, Sep 8, 2014 at 11:35 PM, Sanjeev Neelarapu <
sanjeev.neelarapu@citrix.com> wrote:

> Mike,
>
> You are right. Template gets copied to (secondary-storage) NFS before
> being copied to primary storage
>
> -Sanjeev
>
> -----Original Message-----
> From: Mike Tutkowski [mailto:mike.tutkowski@solidfire.com]
> Sent: Tuesday, September 09, 2014 10:55 AM
> To: dev@cloudstack.apache.org
> Cc: Punith S; Francois Gaudreault
> Subject: Re: S3/Swift Problem around Virtual Size
>
> Hi Will,
>
> Thanks for the input!
>
> I like the idea of storing the virtual size as metadata in S3 or Swift
> although this could require that the end user provide this value when
> uploading the template.
>
> However, if we have the ability to determine the virtual size of the
> template after it gets downloaded to (secondary-storage) NFS and we're able
> to update the database with this info, then it would seem we would never
> need to ask the user for this value.
>
> Either way, the tricky part might be if the template in object storage has
> already been downloaded to (secondary-storage) NFS (say it was used
> before). In this case, we won't need to download it to (secondary-storage)
> NFS again (at least not in the same zone), so we won't have an easy
> opportunity to figure out the virtual size upon download from object
> storage.
>
> I wonder if it's too late in this process if we figured out the virtual
> size before the copied template (now on (secondary-storage) NFS) gets
> copied to primary storage. If we could do it at this point, then we
> wouldn't have to worry about fixing the "legacy" situation because it would
> just work out naturally. We would look in the DB to see if the virtual size
> for this template is known and, if not, we could figure out the virtual
> size before downloading from (secondary-storage) NFS to primary storage
> each time. (Although I'm thinking this would come too late in the process
> because we may have already asked the primary-storage plug-in to create the
> necessary volume.)
>
> By the way, I'm assuming that a template gets copied to
> (secondary-storage) NFS before being copied to primary storage. I'm not
> super familiar with how this process works.
>
> Talk to you later,
> Mike
>
> On Mon, Sep 8, 2014 at 10:59 PM, Will Stevens <wstevens@cloudops.com>
> wrote:
>
> > My two cents on the topic.
> >
> > Ideally we would save the size in the object store metadata and
> > retrieve it from the metadata if it is set.  If it is not set in the
> > object store metadata, then when it is fetched, we have to put it on
> > NFS and determine the size (then ideally save the metadata back to the
> > object store) and remove the NFS copy.
> >
> > This way the NFS copy approach is only ever done once and then the
> > data is populated (for backwards compatibility).  For all templates
> > created after the patch, the metadata would be stored and retrieved
> > without the need for the NFS copy.
> >
> > Is this feasible?
> >
> > Will
> >
> >
> > *Will STEVENS*
> > Lead Developer
> >
> > *CloudOps* *| *Cloud Solutions Experts
> > 420 rue Guy *|* Montreal *|* Quebec *|* H3J 1S6 w cloudops.com *|* tw
> > @CloudOps_
> >
> > On Tue, Sep 9, 2014 at 12:48 AM, Mike Tutkowski <
> > mike.tutkowski@solidfire.com> wrote:
> >
> > > Hi Punith,
> > >
> > > Thanks for putting in time on this!
> > >
> > > So, option 1 occurs after we download the template to S3 or Swift.
> > > We
> > then
> > > have to copy it to NFS so that we can determine the virtual size?
> > > Relatively slow, but it would work.
> > >
> > > If we went this route, would we then delete that template from the
> > > NFS share since its immediate purpose was so we could figure out the
> > > virtual size or would we leave it on that share?
> > >
> > > Option 2 is to allow the user who uploads such a template to specify
> > > the size needed for the root disk (i.e. at least the virtual size of
> > > the template...perhaps larger)?
> > >
> > > Does that sound like I understood the options?
> > >
> > > Thanks!
> > > Mike
> > >
> > > On Mon, Sep 8, 2014 at 10:34 PM, Punith S <punith.s@cloudbyte.com>
> > wrote:
> > >
> > > > hi mike,
> > > >
> > > > i have figured out the issue, in NFS secondary storage the virtual
> > > > size
> > > is
> > > > been calculated by the VHD Processor by accessing the vhd template.
> > > >
> > > > but in case of S3, cloudstack is not able to access the template
> > > > but it only gets to know the physical size of the template!
> > > >
> > > > in order to solve this, we need to download the template from S3
> > > > to another secondary nfs storage and access the template to
> > > > calculate the virtual size.
> > > >
> > > > if the above solution seems to be complicated, we shall have a
> > > > quick
> > fix
> > > > where virtual size i.e the size of the SAN volume shall be
> > > > created(like small-20g, medium-40g) for people using the templates
> from S3.
> > > >
> > > > any feedback's ?
> > > >
> > > >
> > > >
> > > > On Tue, Sep 9, 2014 at 6:34 AM, Mike Tutkowski <
> > > > mike.tutkowski@solidfire.com> wrote:
> > > >
> > > >> Hi Punith,
> > > >>
> > > >> Have you been able to make any progress with regards to this
> > > >> Swift/S3 issue?
> > > >>
> > > >> Thanks!
> > > >> Mike
> > > >>
> > > >> On Wed, Aug 27, 2014 at 7:43 AM, Punith S
> > > >> <punith.s@cloudbyte.com>
> > > wrote:
> > > >>
> > > >> > hi
> > > >> >
> > > >> > think i had a timeout problem!
> > > >> > on the second try the template has been downloaded to the S3
> > > >> > bucket
> > > and
> > > >> > the management server shows the status as download complete
> > > >> > with
> > > >> template
> > > >> > size as 1.6G instead of its virtual size 20G.
> > > >> >
> > > >> > and i see the template's status as Download Complete but it
> > > >> > seems it
> > > is
> > > >> > not getting installed ! refer the attachment
> > > >> >
> > > >> > can anyone explain the "installing template" after the download
> > > >> completes ?
> > > >> >
> > > >> >
> > > >> > On Wed, Aug 27, 2014 at 9:18 AM, Marcus <shadowsor@gmail.com>
> > wrote:
> > > >> >
> > > >> >> Per Edisons comments about not knowing the image size, can't
> > > >> >> we
> > just
> > > >> set
> > > >> >> some headers and store metadata with the template in S3 to
> > > >> >> save the virtual size when the template is registered? I'm
> > > >> >> assuming here that the
> > SSVM
> > > >> does
> > > >> >> the work of pulling the template in and uploading to S3.
Or it
> > could
> > > be
> > > >> >> stored in the template table?
> > > >> >> On Aug 26, 2014 9:11 PM, "Francois Gaudreault" <
> > > >> fgaudreault@cloudops.com>
> > > >> >> wrote:
> > > >> >>
> > > >> >> > Looks like your SSVM cannot reach Internet properly?
> > > >> >> >
> > > >> >> > FG
> > > >> >> >
> > > >> >> > On 2014-08-26, 11:14 AM, Punith S wrote:
> > > >> >> >
> > > >> >> >> hi francois,
> > > >> >> >>
> > > >> >> >> since i'm not having a swift setup, i'm using the
s3 bucket.
> > > >> >> >>
> > > >> >> >> and as you recommended i got the SSVM up with seeded
nfs
> > storage,
> > > >> >> >>
> > > >> >> >> post that i removed the nfs secondary storage and
added the
> > > >> >> >> S3
> > > with
> > > >> >> >> staging nfs store as the new sec storage, since
you cannot
> > > >> >> >> have
> > > any
> > > >> nfs
> > > >> >> >> secondary storage while using the S3.
> > > >> >> >>
> > > >> >> >> on registering the a new template, i'm getting template
> > > >> >> >> status
> > > >> >> as*Unable
> > > >> >> >> to execute HTTP request: No route to host* in
> > > >> >> >> managementserver.log
> > > >> >> >>
> > > >> >> >> 2014-08-26 20:41:07,502 DEBUG [o.a.c.s.RemoteHostEndPoint]
> > > >> >> >> (Timer-24:ctx-b68380cd) Sending command
> > > >> org.apache.cloudstack.storage.
> > > >> >> >> command.DownloadProgressCommand to host: 10
> > > >> >> >> 2014-08-26 20:41:07,507 DEBUG [c.c.a.t.Request]
> > > >> (Timer-24:ctx-b68380cd)
> > > >> >> >> Seq 10-5684105679694996125: Sending  { Cmd , MgmtId:
> > 52242179434,
> > > >> via:
> > > >> >> >> 10(s-142-VM), Ver: v1, Flags: 100011,
> [{"org.apache.cloudstack.
> > > >> >> >>
> > > >> storage.command.DownloadProgressCommand":{"jobId":"d43a17c9-3b03-
> > > >> 4ff9-
> > > >> >> >> 8906-e1d155981e86","request":"GET_STATUS","hvm":true,"
> > > >> >> >>
> > > >>
> description":"centext","maxDownloadSizeInBytes":53687091200,"id":209,"
> > > >> >> >> resourceType":"TEMPLATE","installPath":"template/tmpl/2/
> > > >> >> >> 209/209-2-b624436c-5f37-30d4-8eaf-81582eb0d39d","_store":{"
> > > >> >> >> com.cloud.agent.api.to.S3TO":{"id":14,"uuid":"e4afd7bb-39ea
> > > >> >> >> - 4128-ab93-f8a09b1d5e03","bucketName":"test-cloudstack",
> > > >> >> >> "httpsFlag":false,"created":"Aug 26, 2014 8:16:24
> > > >> >> PM","enableRRS":false,"
> > > >> >> >> maxSingleUploadSizeInBytes":5368709120}},"url":"http://
> > > >> >> >> download.cloud.com/templates/builtin/centos56-x86_64.vhd.bz
> > > >> >> >> 2
> > > >> >> >>
> > > >> >>
> > > >>
> > >
> > ","format":"VHD","accountId":2,"name":"209-2-b624436c-5f37-30d4-8eaf-8
> > 1582eb0d39d","wait":0}}]
> > > >> >> >> }
> > > >> >> >> 2014-08-26 20:41:07,556 DEBUG [c.c.a.t.Request]
> > > >> >> >> (AgentManager-Handler-10:null) Seq 10-5684105679694996125:
> > > >> >> Processing:  {
> > > >> >> >> Ans: , MgmtId: 52242179434, via: 10, Ver: v1, Flags:
10,
> > > >> >> >> [{"com.cloud.agent.api.storage.DownloadAnswer":{"
> > > >> >> >> jobId":"d43a17c9-3b03-4ff9-8906-e1d155981e86","
> > > >> >> >> downloadPct":0,"errorString":"No route to
> > host","downloadStatus":"
> > > >> >> >> DOWNLOAD_ERROR","installPath":"template/tmpl/2/209/209-2-
> > > >> >> >> b624436c-5f37-30d4-8eaf-81582eb0d39d","templateSize":
> > > >> >> >> 0,"templatePhySicalSize":0,"result":true,"details":"No
> > > >> >> >> route to host","wait":0}}] }
> > > >> >> >>
> > > >> >> >> but i don't see any logging happening in secondary
storage
> > > >> >> >> vm's
> > > >> >> cloud.log
> > > >> >> >>
> > > >> >> >> not sure this error is happening due to S3!
> > > >> >> >>
> > > >> >> >>
> > > >> >> >> thanks!
> > > >> >> >>
> > > >> >> >
> > > >> >> >
> > > >> >> > --
> > > >> >> > Francois Gaudreault
> > > >> >> > Gestionnaire de Produit | Product Manager - Cloud Platform
&
> > > Services
> > > >> >> > t:514-629-6775
> > > >> >> >
> > > >> >> > CloudOps Votre partenaire infonuagique | Cloud Solutions
> > > >> >> > Experts
> > > >> >> > 420 rue Guy | Montreal | Quebec | H3J 1S6
> > > >> >> > w: cloudops.com | tw: @CloudOps_
> > > >> >> >
> > > >> >> >
> > > >> >>
> > > >> >
> > > >> >
> > > >> >
> > > >> > --
> > > >> > regards,
> > > >> >
> > > >> > punith s
> > > >> > cloudbyte.com
> > > >> >
> > > >>
> > > >>
> > > >>
> > > >> --
> > > >> *Mike Tutkowski*
> > > >> *Senior CloudStack Developer, SolidFire Inc.*
> > > >> e: mike.tutkowski@solidfire.com
> > > >> o: 303.746.7302
> > > >> Advancing the way the world uses the cloud
> > > >> <http://solidfire.com/solution/overview/?video=play>*™*
> > > >>
> > > >
> > > >
> > > >
> > > > --
> > > > regards,
> > > >
> > > > punith s
> > > > cloudbyte.com
> > > >
> > >
> > >
> > >
> > > --
> > > *Mike Tutkowski*
> > > *Senior CloudStack Developer, SolidFire Inc.*
> > > e: mike.tutkowski@solidfire.com
> > > o: 303.746.7302
> > > Advancing the way the world uses the cloud
> > > <http://solidfire.com/solution/overview/?video=play>*™*
> > >
> >
>
>
>
> --
> *Mike Tutkowski*
> *Senior CloudStack Developer, SolidFire Inc.*
> e: mike.tutkowski@solidfire.com
> o: 303.746.7302
> Advancing the way the world uses the cloud
> <http://solidfire.com/solution/overview/?video=play>*™*
>



-- 
*Mike Tutkowski*
*Senior CloudStack Developer, SolidFire Inc.*
e: mike.tutkowski@solidfire.com
o: 303.746.7302
Advancing the way the world uses the cloud
<http://solidfire.com/solution/overview/?video=play>*™*

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message