[DRBD-user] DRBD 2.5TB Max Size?

Robinson, Eric eric.robinson at psmnv.com
Tue Feb 16 22:19:51 CET 2010

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Sorry, just reposting this with the correct subject line. It somehow got
tagged as spam.

>Am I the only one to find it strange that a file system with a supposed

>limit of 2TiB size shows 2.5TiB free space?

I was actually just researching that question, and I was also wondering
why I need to repartition using GPT labels when, from what I'm reading,
an LVM partition is in fact using a GPT/EFI label, is it not?

LVM clearly "sees" the whole 3.5TB... so why does ext3 only provide
access to 2.5TB of it? 

  --- Physical volume ---
  PV Name               /dev/md3
  VG Name               vg01
  PV Size               3.53 TB / not usable 4.00 MB
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              924811
  Free PE               2064
  Allocated PE          922747
  PV UUID               mcin4K-D9r3-H8gI-rRpy-6UKe-0PrY-OZPwQ8

[root at nas01 ~]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg01/lv01
  VG Name                vg01
  LV UUID                FnabRs-K5pA-Y3IP-W1Jy-RZiP-kmTC-11wqSS
  LV Write Access        read/write
  LV Status              available
  # open                 2
  LV Size                3.52 TB
  Current LE             922747
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     2048
  Block device           253:0

[root at nas01 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/md1               48G  2.6G   43G   6% /
/dev/md0               99M   14M   80M  15% /boot
tmpfs                 1.5G     0  1.5G   0% /dev/shm
/dev/drbd0            2.5T  203M  2.4T   1% /ha_data

Eric Robinson

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