[PVE-User] BTRFS...

Adam Thompson athompso at athompso.net
Wed Feb 3 18:14:28 CET 2016


Oh, and if vda9 was a substantial amount of disk space, pvcreate/vgextend/lvextend/resize2fs to add it back into the filesystem.
Otherwise just leave it alone.
-Adam

On February 3, 2016 11:12:58 AM CST, Adam Thompson <athompso at athompso.net> wrote:
>Ah.  Now I begin to understand what you're after.
>
>(All commands from memory - check man pages for syntax)
>
>Create a new disk in PVE.  (Suggest creating at as virt-scsi, not
>virtio, so that you get TRIM support.)
>
>pvcreate /dev/vdb
>vgcreate DATAVG /dev/vdb
>lvcreate -l90%VG -n DATALV DATAVG #leave a little emergency expansion
>room for next time
>mkfs.ext4 /dev/DATAVG/DATALV
>mount /dev/DATAVG/DATALV /mnt
>rsync -vaxHAXES /opt /mnt
># shut down daemons now
>rsync -vaxHAXES /opt /mnt #yes, again
>umount /opt
>mount /dev/DATAVG/DATALV /opt
># start daemons again
>vi /etc/fstab # make sure correct partition mounts at boot!
>
># optional so you don't remount the old files by accident..
>dd if=/dev/zero of=/dev/vda9 bs=512 count=32768
>
>Later, when you begin to run out again, either add a new disk,
>pvcreate, vgextend, lvextend, resize2fs, OR just grow it.
>When you use an entire raw device as a PV, there's no partition table
>to worry about editing when you resize.  Others will argue that a
>partition table is an important safety measure - choose which benefit
>you prefer.
>
>-Adam
>
>On February 3, 2016 4:04:08 AM CST, Gilberto Nunes
><gilberto.nunes32 at gmail.com> wrote:
>>So, that's the idea...
>>The FS I want grown, is /dev/vda9 that is mounted as /opt.
>>I resize the this via PVE web portal.
>>The /dev/vda had 2 TB and I added more 500 GB...
>>Cfdisk, and parted as well, show that just after /dev/vda9, I have
>more
>>500
>>GB free space....
>>I just want to know, with some certain degree, that I will not loose
>my
>>data under /opt.... All I need...
>>But, as you said: MAKE BACKUP!
>>The problem is: backup from a 2 TB image, that is use as mail server
>is
>>very slow and problematic....
>>But I will give a way!
>>Thanks btw!
>>
>>
>>2016-02-03 5:07 GMT-02:00 Wolfgang Bumiller <w.bumiller at proxmox.com>:
>>
>>> > On February 2, 2016 at 8:07 PM Adam Thompson
>><athompso at athompso.net>
>>> wrote:
>>> >
>>> > On 16-02-02 11:24 AM, Gilberto Nunes wrote:
>>> > > Hi
>>> > >
>>> > > And what if I work with BTRFS inside the VM???
>>> > > The FS where VM image lay could be any other FS... Currently, I
>>am use
>>> > > GlusterFS + XFS.
>>> > > I need LVM or BRTFS inside the VM, in order to resize disk
>>partition...
>>> > > And I am between LVM or BRTFS....
>>> >
>>> > Only if you need to do *online* resizes (without unmounting the
>>> > filesystem).  If you can live with unmounting the filesystem,
>plain
>>old
>>> > ext3 (and ext4) can do what you need.  Of course, if it's the root
>>> > filesystem you need to resize, the only way to unmount it is to
>>shut
>>> > down the VM and reboot it in single-user mode.  I think you might
>>need
>>> > to boot off a CD to resize the root fs, can't remember if there's
>a
>>way
>>> > around it.
>>>
>>> Actually resize2fs works on mounted file systems as long as you're
>>only
>>> growing it and not shrinking it, including the root filesystem.
>>>
>>> >><<
>>>
>>> > On February 2, 2016 at 4:38 PM Gilberto Nunes <
>>> gilberto.nunes32 at gmail.com> wrote:
>>> > That's other doubt... I will lose data if I do it with parted
>>> resizepart???
>>>
>>> No, but naturally you should make a backup just in case, especially
>>when
>>> you do this the first time.
>>> Of course there are some limitations when you need online resizing
>>without
>>> downtime. Then you can only grow a partition without moving it. In
>>other
>>> words you can only resize a partition if there's physical free space
>>> directly
>>> after it. (Most of the time this is the case since you usually have
>>the
>>> boot partition first and then the root and maybe a home or data
>>partition,
>>> and most of the time that last one is the one you want to resize ;-)
>>)
>>> Eg. with [boot, root, home] after resizing the physical disk you end
>>up
>>> with
>>> [boot, root, home, <frees space>], so you can only resize the home
>>> partition.
>>> If you can afford down time you can also use parted to move
>>partitions so
>>> that
>>> you can resize any of them.  This however takes a lot longer and is
>a
>>bit
>>> more risky, so in this case you should _always_ make a backup even
>if
>>you
>>> know
>>> what you're doing.
>>>
>>>
>>
>>
>>-- 
>>
>>Gilberto Ferreira
>>+55 (47) 9676-7530
>>Skype: gilberto.nunes36
>
>-- 
>Sent from my Android device with K-9 Mail. Please excuse my brevity.
>
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>
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-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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