Hello Stefan Peter/Adam before of all regards for you reply.
My problem is that I have 3 disk of 1 TB each, 2 disk are in RAID 1 (mirror
with mdadm) and is near to full, the TopDir is mounting on this RAID via LVM
(PV and LV).
The server is an ordinary PC desktop, so can't put much more disk.
From the first disk only I use a litle partition (LV) to operating system and
backuppc binaries, the rest of the disk (1 TB) in not used.
My question is: it is posible to mount another space to do backups (like
another TopDir on backuppc) using the rest available of the first disk,
butindependent of the RAID 1 that I have ? because this disk are not in
RAID 1 mirrored, so can I put not critical backups there. Regards. Juan
Manuel.
PD: the other way is to drop all an make a RAID 5 with the 3 disk (1 TB)
and redo all installations.
On 13/09/16 22:00, Adam Goryachev wrote:
> On 14/09/16 08:24, Stefan Peter wrote:
>> Dear Juan Manuel,
>>
>> On 13.09.2016 16:57, Juan Manuel wrote:
>>> Hello we have a backuppc server and work perflectly, but it near to disk
>>> full.
>>>
>>> So it is posible to add another resource/filesystem that to use
>>> backuppc, another TopDir ?
>>>
>>> We dont have more disk space on the same disk, but we can add another disks.
>>>
>>> The resource (TopDir) /backuppc is actually in a logical volume LVM. We
>>> try to find a solution that not imply using expanding logical volume
>>> with other physical volume on LVM.
>> Why don't you want to expand the LVM volume? The ability to expand,
>> shrink, migrate and taking snap shoots are the only valid reason to use
>> LVM, IMHO. And all these operations are more or less painless (I just
>> migrated a 12TByte BackupPC volume from an old raid to a new one, which
>> is possible without even unmounting the volume!).
>>
>> You can find more information about LVM at
>> http://tldp.org/HOWTO/LVM-HOWTO/
>> by the way.
>>
>> With kind regards
>>
>> Stefan Peter
>>
> I would have to agree, why use LVM if you aren't planning on ... using it?
> Although, I would suggest that if the underlying physical device is
> full, there are two ways to expand that:
> 1) Assuming the underlying physical is RAID, then expand the RAID by
> adding additional devices, or replacing the drives with larger ones
> 2) Assuming you can't do the above because it's hardware RAID or some
> other constraint, then add a second RAID array, and extend your existing
> VG onto this second array, and then extend your LV to use both. This is
> basically equivalent to RAID 10 (assuming your underlying PV's are RAID
> 1) or RAID 50 (assuming the underlying PV's are RAID5).
>
> Personally, I tend to use linux software RAID to build up the PV as big
> as needed, and then use LVM to divide a single PV into the multiple LV's
> and snapshots, though it is possibly to just use all the physical drives
> as PV's, and let LVM handle the RAID across them.
>
> Regards,
> Adam
>
>
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