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Re: Maximum file system size of XFS?

To: xfs@xxxxxxxxxxx
Subject: Re: Maximum file system size of XFS?
From: Martin Steigerwald <Martin@xxxxxxxxxxxx>
Date: Mon, 11 Mar 2013 23:04:14 +0100
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <201303112301.51715.Martin@xxxxxxxxxxxx>
References: <20130309215121.0e614ef8@thinky> <201303112257.00798.Martin@xxxxxxxxxxxx> <201303112301.51715.Martin@xxxxxxxxxxxx> (sfid-20130311_230306_047422_F9446F7E)
User-agent: KMail/1.13.7 (Linux/3.9.0-rc2-tp520; KDE/4.9.5; x86_64; ; )
Am Montag, 11. MÃrz 2013 schrieb Martin Steigerwald:
> Am Montag, 11. MÃrz 2013 schrieb Martin Steigerwald:
> > Am Montag, 11. MÃrz 2013 schrieb Martin Steigerwald:
> > > 2) Create a insanely big sparse file
> > > 
> > > merkaba:~> truncate -s1E /mnt/zeit/evenmorecrazy.img
> > > merkaba:~> ls -lh /mnt/zeit/evenmorecrazy.img
> > > -rw-r--r-- 1 root root 1,0E MÃr 11 22:37 /mnt/zeit/evenmorecrazy.img
> > > 
> > > (No, this wonÂt work with Ext4.)
> > 
> > Okay, you canÂt go beyond 8 EiB for a single file which is about what I
> 
> > have read somewhere:
> [â]
> 
> > merkaba:/mnt/zeit> truncate -s7E /mnt/zeit/evenmorecrazy.img
> > merkaba:/mnt/zeit> LANG=C truncate -s8E /mnt/zeit/evenmorecrazy.img
> > truncate: invalid number '8E': Value too large for defined data type
> > merkaba:/mnt/zeit#1> ls -lh
> > insgesamt 0
> > -rw-r--r-- 1 root root 7,0E MÃr 11 22:49 evenmorecrazy.img
> > 
> > So so tests stops there, until you concatenate two of those files with
> > LVM or SoftRAID 0 (if that works). Like this (I just had to try it):
> > 
> > 
> > merkaba:/mnt/zeit> ls -lh
> > insgesamt 0
> > -rw-r--r-- 1 root root 7,0E MÃr 11 22:49 evenmorecrazy.img
> > -rw-r--r-- 1 root root 7,0E MÃr 11 22:52 evenmorecrazy.img2
> > merkaba:/mnt/zeit> losetup /dev/loop0 evenmorecrazy.img
> > merkaba:/mnt/zeit> losetup /dev/loop1 evenmorecrazy.img2
> > 
> > merkaba:/mnt/zeit#5> pvcreate /dev/loop0
> > 
> >   Physical volume "/dev/loop0" successfully created
> > 
> > merkaba:/mnt/zeit> pvcreate /dev/loop1
> > 
> >   Physical volume "/dev/loop1" successfully created
> > 
> > merkaba:/mnt/zeit> vgcreate justinsane /dev/loop0 /dev/loop1
> > 
> >   PV /dev/loop0 too large for extent size 4,00 MiB.
> >   Format-specific setup of physical volume '/dev/loop0' failed.
> >   Unable to add physical volume '/dev/loop0' to volume group
> > 
> > 'justinsane'.
> 
> [â]
> 
> > merkaba:/mnt/zeit#5> vgcreate --physicalextentsize 4G  justinsane
> > /dev/loop0 /dev/loop1
> > 
> >   Volume group "justinsane" successfully created
> > 
> > merkaba:/mnt/zeit> vgs
> > 
> >   VG         #PV #LV #SN Attr   VSize   VFree
> >   justinsane   2   0   0 wz--n-  14,00e 14,00e
> >   merkaba      1   4   0 wz--n- 278,99g  4,85g
> > 
> > merkaba:/mnt/zeit>
> > 
> > merkaba:/mnt/zeit> vgdisplay justinsane
> 
> [â]
> 
> > Enough insanity for today :)
> 
> Not quite:
> > I wonÂt mkfs.xfs on it, the 20 GiB of the just filesystem wouldnÂt be
> > enough.
> 
> Ok, there seems to be another limit involved:
> 
> merkaba:/mnt/zeit> lvcreate -n yourbiggiexfs -L14E justinsane
>   Volume group "justinsane" has insufficient free space (3758096382
> extents): 3758096384 required.
[â]
> merkaba:/mnt/zeit#5> LANG=C lvcreate -n yourbiggiexfs -L13E justinsane
>   /dev/justinsane/yourbiggiexfs: lseek 0 failed: Invalid argument
>   /dev/justinsane/yourbiggiexfs: lseek 0 failed: Invalid argument
>   Logical volume "yourbiggiexfs" created
> merkaba:/mnt/zeit> LANG=C lvs
>   /dev/justinsane/yourbiggiexfs: lseek 14987979559888945152 failed:
> Invalid argument
>   /dev/justinsane/yourbiggiexfs: lseek 14987979559889002496 failed:
> Invalid argument

Well,

merkaba:/mnt/zeit> LANG=C ls -l
total 24
-rw-r--r-- 1 root root 8070450532247928832 Mar 11 23:02 evenmorecrazy.img
-rw-r--r-- 1 root root 8070450532247928832 Mar 11 23:02 evenmorecrazy.img2

looks crazy enough for me already.

(Ok, I really stop this now :)

Thanks,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

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