[linux-lvm] strange usage stats for thin LV

[Andres Toomsalu]

Im trying with latest 2.6.32-279.11.1.el6 RHEL6.3 kernel but still no luck - FITRIM ioctl failed: Operation not supported.
Is there any way to discard/trim unused blocks with RHEL6.3?
What happens if no cleanup is done and blocks count reaches 100%? 

Regards,
-- 
----------------------------------------------
Andres Toomsalu
On 11.11.2012, at 10:22, Vitaly Yakovenko wrote:

> Hi,
> 
> I have the problem with fstrim too.
> 
> some details:
> 
> uname -a
> Linux test.local 2.6.32-279.14.1.el6.x86_64 #1 SMP Tue Nov 6 23:43:09 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
> 
> 
> mount
> /dev/mapper/VolGroup00-lv_root on / type ext4 (rw)
> proc on /proc type proc (rw)
> sysfs on /sys type sysfs (rw)
> devpts on /dev/pts type devpts (rw,gid=5,mode=620)
> tmpfs on /dev/shm type tmpfs (rw)
> /dev/md0 on /boot type ext4 (rw)
> none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
> /dev/mapper/VolGroup00-lv_test1 on /mnt/test1 type ext4 (rw)
> /dev/mapper/VolGroup00-lv_test2 on /mnt/test2 type ext4 (rw)
> /dev/mapper/VolGroup00-lv_test5 on /mnt/test5 type xfs (rw)
> 
> 
> df -h
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/mapper/VolGroup00-lv_root
>                        20G  2.3G   17G  13% /
> tmpfs                 1.6G     0  1.6G   0% /dev/shm
> /dev/md0               99M   27M   67M  29% /boot
> /dev/mapper/VolGroup00-lv_test1
>                        40G  2.6G   35G   7% /mnt/test1
> /dev/mapper/VolGroup00-lv_test2
>                       4.0G  1.2G  2.6G  32% /mnt/test2
> /dev/mapper/VolGroup00-lv_test5
>                       3.0G  725M  2.3G  24% /mnt/test5
> 
> 
> lvs -a -o+metadata_percent
>   LV                VG         Attr     LSize   Pool      Origin Data%  Move Log Copy%  Convert Meta% 
>   lv_native         VolGroup00 -wi-a---   5.00g                                                       
>   lv_root           VolGroup00 -wi-ao--  20.00g                                                       
>   lv_swap           VolGroup00 -wi-ao--   4.00g                                                       
>   lv_test1          VolGroup00 Vwi-aotz  40.00g thin_pool         27.73                               
>   lv_test2          VolGroup00 Vwi-aotz   4.00g thin_pool         98.61                               
>   lv_test5          VolGroup00 Vwi-aotz   3.00g thin_pool         45.40                               
>   thin_pool         VolGroup00 twi-a-tz 100.00g                   16.40                           8.47
>   [thin_pool_tdata] VolGroup00 Twi-aot- 100.00g                                                       
>   [thin_pool_tmeta] VolGroup00 ewi-aot- 100.00m
> 
> 
> This test server (CentOS 6.3 - not install from scratch). I was updated this server from 6.2 version:
> 
> last | tail -3
> reboot   system boot  2.6.32-220.el6.x Mon Jan 23 16:03 - 16:04  (00:01)    
> wtmp begins Mon Jan 23 16:03:26 2012
> 
> 
> I test only ext4 fs partitions.
> When I used fstrim I had next error:
> 
> fstrim /mnt/test1
> fstrim: /mnt/test1: FITRIM ioctl failed: Operation not supported
> 
> I want retrieve free space from the ext4 fs to the total free space of thin_pool after delete files on the ext4 fs  (lv_test1).I will have more free space for another thin LV.
> Is it possible to get it?
> 
> Thanks in advance.
> 
> -- 
> Best regards,
> Vitaly Yakovenko |
> 
> _______________________________________________
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

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