Big disks

G

gondouin

New Member
Jul 16, 2009
19
0
1
Créteil, near Paris (France)
Hi,
I just bought a Dell R710 with 6 HD of 2Tb and I make this Raid configuration :

  • 2 Disks Raid 1 (systems) = 2 Tb
  • 4 Disks Raid 10 (Datas) = 4 Tb
The proxmox installation is ok on the /dev/sda volume

When I partition the second volume with fdisk, sfdisk or cfdisk, I obtain only a 1,8 Tb partition and I can't make another one (no free space)...
How can I build a 4 Tb LVM partition :confused: ?

Thanks,
 
Nice, I'll try monday (and do a report here).
I've installed parted friday, but it don't know LVM partitions
I will search with your informations....
I think to make an apt-get install gdisk whose is the same tool than fdisk but with the gpt support

Thanks
 
Last edited:
All right !
If I do a pvcreate /dev/sdb and and vgextend pve /dev/sdb it will be nice ?
I see in the howto, it's not recommended to use a whole disk as a PV (for use with others OS... But I don't want use another OS...

Finally, I think I can make a Raid 10 with the 6 entire disks (I don't know if it is possible), and it will be the same think exept an easiest installation of proxmox...
 
Last edited:
gondouin said:
All right !
If I do a pvcreate /dev/sdb and and vgextend pve /dev/sdb it will be nice ?
I see in the howto, it's not recommended to use a whole disk as a PV (for use with others OS... But I don't want use another OS...
Click to expand...

yes, should work.

gondouin said:
Finally, I think I can make a Raid 10 with the 6 entire disks (I don't know if it is possible), and it will be the same think exept an easiest installation of proxmox...
Click to expand...

Yes, that sounds good (maybe a spare disk is also a good idea).
 
Bad news : 5 hours later (initializing the raid 10 with 6 HD of 2 TB), I reboot the mini-pc with the proxmox cd (1.4-4390)...
Error : Unable to create datavolume at /usr/bin/proxinstall line 577
Same thing with 5 disks in Raid 5 and one for hot spare.
I will try January 4th (holidays) with my older Raid config.
I need disk speed but data security (waiting HA) and the procs can assume (2 Xeon 2,93 Ghz with 96 GB DDR3 at 1333Mhz).
I accept any suggestions ;-)
 
gondouin said:
Bad news : 5 hours later (initializing the raid 10 with 6 HD of 2 TB), I reboot the mini-pc with the proxmox cd (1.4-4390)...
Error : Unable to create datavolume at /usr/bin/proxinstall line 577
Click to expand...

So how large is it exactly? (needs to be smaller than 2TB).
 
Since when I add what's generally accepted as 1 Gb of RAM to a box & BIOS reads it as 1024 Mb, I usually calculate things in multiples of 1024 to squeeze as much space out of whatever I'm doing- usually partitioning.

eg. When I create a 2 Tb partition, most of the time 2048000 winds up being displayed as 1.9 Tb.

Not in Proxmox:

Error: unable to apply VM settings, command failed: /usr/sbin/qm set 105 --ide1 datastore0:2048000,format=raw

Even when I reduce it to below 2000000, I get:

Error: unable to apply VM settings, command failed: /usr/sbin/qm set 105 --ide1 datastore0:1999872,format=raw

What's this all about here? I thought the whole point of 64-bit was to not have these kind of limitations.
 
I'm an idiot.

Nevermind, sorry to bump needlessly.

I hadn't added the new space from the RAID controller yet & was inadvertently using the existing 1 Tb LVM.
 
My soluce :
I'd install proxmox on the primary raid volume (Raid 1)
Then I'd download gdisk for amd64 (sid)
then gdisk /dev/sdb
write gpt instead of mbr and one partition of 4 TB with LVM
pvcreate /dev/sdb1
vgcreate raid10 /dev/sdb1
and I see the volume in proxmox interface !!!
It was what I want ! ;)
I don't understand what you mean with Ram (I have 96 GB of Ram for this server) :-)
 
Last edited:
I was simply using an account of my experience with upgrading RAM in order to illustrate how numbers don't necessarily represent what they say they do.

In 10^2, 1 GB = 1,024.00 MB.
In 10^3, 1 GB = 1,000.00 MB.

For example in my PERC 6/i controller when I try to create a disk of 1000000 MB, it rounds down to 999996 MB, and is displayed in the RAID controller as 976.558 GB.
That unpartitioned space is displayed by cfdisk as 1048566.92 MB, and after format to ext3 & adding as a directory displays as 912.40 MB in the web interface.

So when I'm trying to use all the space I can in a system whose docs state there being a 2 TB limit, I find it difficult to use all 2.
 
You must log in or register to reply here.
Top Bottom