Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Fri, 2006-09-01 at 13:50 +0700, Anthony Dawson wrote:
> The mapping of disk /dev/drbd? devices to /dev/hda? is determined by the
> entries in the node section as is the meta-data disk to be used. U do not
> use a drbd in the meta-disk specification but an hd?? device
>
Ofcourse. I assumed that /dev/drbd0 is associated with /dev/hda1 in
configurations. Now /dev/hda1 has some data and we want it to be alive
after we mount it as /dev/drbd0. Now if we are using external
metadata, /dev/hda1 will be unchanged when it will be mounted
as /dev/drbd0, isn't it? :-)
> Regarding size:
>
> Not sure what version of drbd you are talking about but here is an extract
> from the latest drbd.conf file
>
> # Upgrading from DRBD-0.6.x
> #
> # Using the size parameter in the disk section (was disk-size) is
> # no longer valid. The agreed disk size is now stored
> # in DRBD's non volatile meta data files.
>
> And as far as I know the size is now fixed to 128meg per drbd device.
Yes its fixed. I have tried changing it to greater (640MB). I was
successful.
entry in drbd-8.0pre3/scripts/drbd.conf: 196
# In case you only want to use a fraction of the available space
# you might use the "size" option here.
#
# size 10G;
>
> Regards,
>
> Anthony
>
>
> ----- Original Message -----
> From: "Milind Dumbare" <milind at linsyssoft.com>
> To: "Anthony Dawson" <anthony.dawson at bcs.org>
> Sent: Friday, September 01, 2006 1:29 PM
> Subject: Re: [DRBD-user] formatting of drbd partition
>
>
> >I was talking about th situation of using metadata on an external
> > volume, In that case eventually underlying volume (/dev/hda1) is same as
> > the drbd device (/dev/drbd0) you mount.
> > Ofcourse if you have not specified "size" variable in configuration
> > (drbd.conf) to use some less amount in volume from what is available.
> >
> > On Thu, 2006-08-31 at 22:04 +0700, Anthony Dawson wrote:
> >> That is not exactly correct /dev/drbd0 is not necessarily the same as
> >> /dev/hda1 the mapping is defined in the resources sections of the
> >> drbd.conf
> >> file. It is correct that you do not need to create a file system on the
> >> partition, the old one will do. However you will lose 128Mb at the end of
> >> that partition unless you use a separate partition or device for the
> >> metadata.
> >>
> >> on node1 {
> >> device /dev/drbd0;
> >> disk /dev/hda6;
> >> address 192.168.1.95:7788;
> >> meta-disk /dev/hda5 [0];
> >> }
> >>
> >> in the above /dev/drbd0 maps to /dev/hda6 and I am using a separate
> >> partition for the metadata meta-disk /dev/hda5
> >>
> >> When you come to starting the servers make very sure you sync your
> >> systems
> >> correctly to be more precise make sure you make the machine with your
> >> valuable data the master or you will destroy everything that is on there
> >> so
> >> run the command "drbdadm -- --do-what-I-say primary all" on your master
> >> that
> >> should then sync your master's with the good data over to your slave
> >> rather
> >> than the other way around. (I hope I got that right :-)
> >>
> >> repeated cat /proc/drbd will show you the progress of syncing the two
> >> disks
> >>
> >> Finally remember to mount dev/drbd0 and NOT the /dev/hda? device
> >>
> >> Regards,
> >>
> >> Anthony
> >> P.S. if you can make a back up of you valuable data before doign anything
> >> I
> >> would.... hard disks are cheap these days do a dd and bit copy your data
> >> to
> >> another device... takes no more than a few minutes to be safer
> >>
> >> ----- Original Message -----
> >> From: "Milind Dumbare" <milind at linsyssoft.com>
> >> To: "khaja mohideen" <skm_mail at yahoo.com>
> >> Cc: <drbd-user at lists.linbit.com>
> >> Sent: Thursday, August 31, 2006 7:10 PM
> >> Subject: Re: [DRBD-user] formatting of drbd partition
> >>
> >>
> >> > You never format the partition. You just use it virtually through DRBD.
> >> > so even if you mount /dev/drbd0, its /dev/hda1 what is mounted.
> >> >
> >> > When you give internal meta-data, 128MB of disk is taken which might
> >> > overwrite your file-system or any important data. I am not sure but try
> >> > using external metadata, It should help you.
> >> >
> >> >
> >> > On Thu, 2006-08-31 at 04:09 -0700, khaja mohideen wrote:
> >> >> Hi,
> >> >>
> >> >> What would happen if i mount the 100 GB
> >> >> partition(/dev/hda1) without formatting as /dev/drbd0.
> >> >>
> >> >> In slave I would allocate the exact 100 GB size for
> >> >> drbd.
> >> >>
> >> >>
> >> >> Then would it solve.
> >> >>
> >> >>
> >> >> Any help
> >> >>
> >> >>
> >> >> SKM
> >> >>
> >> >>
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> --- Milind Dumbare <milind at linsyssoft.com> wrote:
> >> >>
> >> >> > On Thu, 2006-08-31 at 03:34 -0700, khaja mohideen
> >> >> > wrote:
> >> >> > > Hi,
> >> >> > >
> >> >> > > I have partition 100 GB size. Do i need to
> >> >> > format
> >> >> > > this partition once i installed & mount as
> >> >> > /dev/drbd0
> >> >> > > device.
> >> >> > >
> >> >> > > Currently it contains 80 GB of data. So backing
> >> >> > &
> >> >> > > restoring would be a painful job. Can drbd be
> >> >> > used
> >> >> > > without formatting it.
> >> >> > >
> >> >> > >
> >> >> > I think using external volume for metadata in
> >> >> > configuration
> >> >> > can help you out.
> >> >> >
> >> >> > > Pls Help.
> >> >> > >
> >> >> > >
> >> >> > > SKM
> >> >> > >
> >> >> > > __________________________________________________
> >> >> > > Do You Yahoo!?
> >> >> > > Tired of spam? Yahoo! Mail has the best spam
> >> >> > protection around
> >> >> > > http://mail.yahoo.com
> >> >> > > _______________________________________________
> >> >> > > drbd-user mailing list
> >> >> > > drbd-user at lists.linbit.com
> >> >> > > http://lists.linbit.com/mailman/listinfo/drbd-user
> >> >> > >
> >> >> > >
> >> >> > --
> >> >> > -Milind
> >> >> > "There is no place like 127.0.0.1"
> >> >> >
> >> >> >
> >> >>
> >> >>
> >> >> __________________________________________________
> >> >> Do You Yahoo!?
> >> >> Tired of spam? Yahoo! Mail has the best spam protection around
> >> >> http://mail.yahoo.com
> >> >> _______________________________________________
> >> >> drbd-user mailing list
> >> >> drbd-user at lists.linbit.com
> >> >> http://lists.linbit.com/mailman/listinfo/drbd-user
> >> >>
> >> >>
> >> > --
> >> > -Milind
> >> > "There is no place like 127.0.0.1"
> >> >
> >> > _______________________________________________
> >> > drbd-user mailing list
> >> > drbd-user at lists.linbit.com
> >> > http://lists.linbit.com/mailman/listinfo/drbd-user
> >>
> >>
> >>
> > --
> > -Milind
> > "There is no place like 127.0.0.1"
> >
>
>
>
--
-Milind
"There is no place like 127.0.0.1"