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Old 06-28-2012, 08:25 AM
Rafał Radecki
 
Default Strange du/df behaviour.

Hi all.

I have currently a server:
cat /etc/redhat-release
CentOS release 5.7 (Final)
uname -a
Linux host.domain.com 2.6.18-274.18.1.el5 #1 SMP Thu Feb 9 12:45:44
EST 2012 x86_64 x86_64 x86_64 GNU/Linux
I have there a filesystem mounted:

/dev/vg0/paczki /home/paczki-workdir ext4
defaults,noatime 0 0



on which df gives strange output:

LANG=C df -h /home/paczki-workdir;sleep 3;df -h /home/paczki-workdir
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg0-paczki
1008G 268G 690G 28% /home/paczki-workdir
System plików rozm. użyte dost. %uż. zamont. na
/dev/mapper/vg0-paczki
1008G 155G 803G 17% /home/paczki-workdir


du -sk /home/paczki-workdir;sleep 3;du -sk /home/paczki-workdir
48426364 /home/paczki-workdir
48428980 /home/paczki-workdir

du -sh /home/paczki-workdir;sleep 3;du -sh /home/paczki-workdir
47G /home/paczki-workdir
47G /home/paczki-workdir

Currently there is only one process writing to the filesystem:

root 27945 27918 3 09:16 ? 00:01:44 tar
--exclude=*/Maildir/.Spam/cur/* --exclude=*/Maildir/.Spam/new/*
--use-compress-program /usr/bin/pigz -cf
/home/paczki-workdir/abaksa-mail-20120628-0413.tgz

and it writes so much data:

du -sh /home/paczki-workdir/abaksa-mail-20120628-0413.tgz;sleep 3;du
-sh /home/paczki-workdir/abaksa-mail-20120628-0413.tgz
13G /home/paczki-workdir/abaksa-mail-20120628-0413.tgz
13G /home/paczki-workdir/abaksa-mail-20120628-0413.tgz

du -sk /home/paczki-workdir/abaksa-mail-20120628-0413.tgz;sleep 3;du
-sk /home/paczki-workdir/abaksa-mail-20120628-0413.tgz
13410988 /home/paczki-workdir/abaksa-mail-20120628-0413.tgz
13425040 /home/paczki-workdir/abaksa-mail-20120628-0413.tgz

I've also noticed that when nothing writes to this filesystem than df
output also varies over short time periods.
When I've updated the kernel and restarted the host for few hours df
was showing ok info. There is no info about problems in
/var/log/messages and dmesg.

Additional info:

vgdisplay -v vg0
Using volume group(s) on command line
Finding volume group "vg0"
--- Volume group ---
VG Name vg0
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 7
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 3,64 TB
PE Size 4,00 MB
Total PE 953863
Alloc PE / Size 786432 / 3,00 TB
Free PE / Size 167431 / 654,03 GB
VG UUID wRjDqu-TUlW-7YH2-j6xl-nuc1-EczW-D2CAOK

--- Logical volume ---
LV Name /dev/vg0/paczki
VG Name vg0
LV UUID 0EyRjA-p90A-bfX6-1zEA-eMba-5Hn5-jc9slo
LV Write Access read/write
LV Status available
# open 1
LV Size 1,00 TB
Current LE 262144
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 512
Block device 253:0

--- Logical volume ---
LV Name /dev/vg0/msklon5
VG Name vg0
LV UUID 8nlU4T-Qozl-bPnr-JOmh-g9Pi-cabs-J7yI7V
LV Write Access read/write
LV Status available
# open 1
LV Size 2,00 TB
Current LE 524288
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 512
Block device 253:1

--- Physical volumes ---
PV Name /dev/md0
PV UUID hly53e-wbbR-5xLo-3P4k-U4xt-8XeR-W0YCul
PV Status allocatable
Total PE / Free PE 953863 / 167431

mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Wed Apr 11 10:37:04 2012
Raid Level : raid10
Array Size : 3907023872 (3726.03 GiB 4000.79 GB)
Used Dev Size : 1953511936 (1863.01 GiB 2000.40 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Thu Jun 28 10:17:04 2012
State : active
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0

Layout : near=2
Chunk Size : 64K

UUID : 423fd5cf:beedc018:915808f0:8ec673de
Events : 0.845339

Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
3 8 65 3 active sync /dev/sde1

Any clues why du shows wrong and floating info?

Best regards,
Rafal Radecki.
_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
 
Old 06-28-2012, 08:26 AM
Rafał Radecki
 
Default Strange du/df behaviour.

Update:
Any clues why df shows wrong and floating info?

2012/6/28 Rafał Radecki <radecki.rafal@gmail.com>:
> Hi all.
>
> I have currently a server:
> cat /etc/redhat-release
> CentOS release 5.7 (Final)
> uname -a
> Linux host.domain.com 2.6.18-274.18.1.el5 #1 SMP Thu Feb 9 12:45:44
> EST 2012 x86_64 x86_64 x86_64 GNU/Linux
> I have there a filesystem mounted:
>
> /dev/vg0/paczki * * * * * * */home/paczki-workdir *ext4
> defaults,noatime * * * * * 0 0
>
>
>
> on which df *gives strange output:
>
> LANG=C df -h /home/paczki-workdir;sleep 3;df -h /home/paczki-workdir
> Filesystem * * * * * *Size *Used Avail Use% Mounted on
> /dev/mapper/vg0-paczki
> * * * * * * * * * * 1008G *268G *690G *28% /home/paczki-workdir
> System plików * * * * rozm. użyte dost. %uż. zamont. na
> /dev/mapper/vg0-paczki
> * * * * * * * * * * 1008G *155G *803G *17% /home/paczki-workdir
>
>
> du -sk /home/paczki-workdir;sleep 3;du -sk /home/paczki-workdir
> 48426364 * * * */home/paczki-workdir
> 48428980 * * * */home/paczki-workdir
>
> du -sh /home/paczki-workdir;sleep 3;du -sh /home/paczki-workdir
> 47G * * /home/paczki-workdir
> 47G * * /home/paczki-workdir
>
> Currently there is only one process writing to the filesystem:
>
> root * * 27945 27918 *3 09:16 ? * * * *00:01:44 tar
> --exclude=*/Maildir/.Spam/cur/* --exclude=*/Maildir/.Spam/new/*
> --use-compress-program /usr/bin/pigz -cf
> /home/paczki-workdir/abaksa-mail-20120628-0413.tgz
>
> and it writes so much data:
>
> du -sh /home/paczki-workdir/abaksa-mail-20120628-0413.tgz;sleep 3;du
> -sh /home/paczki-workdir/abaksa-mail-20120628-0413.tgz
> 13G * * /home/paczki-workdir/abaksa-mail-20120628-0413.tgz
> 13G * * /home/paczki-workdir/abaksa-mail-20120628-0413.tgz
>
> du -sk /home/paczki-workdir/abaksa-mail-20120628-0413.tgz;sleep 3;du
> -sk /home/paczki-workdir/abaksa-mail-20120628-0413.tgz
> 13410988 * * * */home/paczki-workdir/abaksa-mail-20120628-0413.tgz
> 13425040 * * * */home/paczki-workdir/abaksa-mail-20120628-0413.tgz
>
> I've also noticed that when nothing writes to this filesystem than df
> output also varies over short time periods.
> When I've updated the kernel and restarted the host for few hours df
> was showing ok info. There is no info about problems in
> /var/log/messages and dmesg.
>
> Additional info:
>
> vgdisplay -v vg0
> * *Using volume group(s) on command line
> * *Finding volume group "vg0"
> *--- Volume group ---
> *VG Name * * * * * * * vg0
> *System ID
> *Format * * * * * * * *lvm2
> *Metadata Areas * * * *1
> *Metadata Sequence No *7
> *VG Access * * * * * * read/write
> *VG Status * * * * * * resizable
> *MAX LV * * * * * * * *0
> *Cur LV * * * * * * * *2
> *Open LV * * * * * * * 2
> *Max PV * * * * * * * *0
> *Cur PV * * * * * * * *1
> *Act PV * * * * * * * *1
> *VG Size * * * * * * * 3,64 TB
> *PE Size * * * * * * * 4,00 MB
> *Total PE * * * * * * *953863
> *Alloc PE / Size * * * 786432 / 3,00 TB
> *Free *PE / Size * * * 167431 / 654,03 GB
> *VG UUID * * * * * * * wRjDqu-TUlW-7YH2-j6xl-nuc1-EczW-D2CAOK
>
> *--- Logical volume ---
> *LV Name * * * * * * * */dev/vg0/paczki
> *VG Name * * * * * * * *vg0
> *LV UUID * * * * * * * *0EyRjA-p90A-bfX6-1zEA-eMba-5Hn5-jc9slo
> *LV Write Access * * * *read/write
> *LV Status * * * * * * *available
> *# open * * * * * * * * 1
> *LV Size * * * * * * * *1,00 TB
> *Current LE * * * * * * 262144
> *Segments * * * * * * * 1
> *Allocation * * * * * * inherit
> *Read ahead sectors * * auto
> *- currently set to * * 512
> *Block device * * * * * 253:0
>
> *--- Logical volume ---
> *LV Name * * * * * * * */dev/vg0/msklon5
> *VG Name * * * * * * * *vg0
> *LV UUID * * * * * * * *8nlU4T-Qozl-bPnr-JOmh-g9Pi-cabs-J7yI7V
> *LV Write Access * * * *read/write
> *LV Status * * * * * * *available
> *# open * * * * * * * * 1
> *LV Size * * * * * * * *2,00 TB
> *Current LE * * * * * * 524288
> *Segments * * * * * * * 1
> *Allocation * * * * * * inherit
> *Read ahead sectors * * auto
> *- currently set to * * 512
> *Block device * * * * * 253:1
>
> *--- Physical volumes ---
> *PV Name * * * * * * * /dev/md0
> *PV UUID * * * * * * * hly53e-wbbR-5xLo-3P4k-U4xt-8XeR-W0YCul
> *PV Status * * * * * * allocatable
> *Total PE / Free PE * *953863 / 167431
>
> mdadm --detail /dev/md0
> /dev/md0:
> * * * *Version : 0.90
> *Creation Time : Wed Apr 11 10:37:04 2012
> * * Raid Level : raid10
> * * Array Size : 3907023872 (3726.03 GiB 4000.79 GB)
> *Used Dev Size : 1953511936 (1863.01 GiB 2000.40 GB)
> * Raid Devices : 4
> *Total Devices : 4
> Preferred Minor : 0
> * *Persistence : Superblock is persistent
>
> * *Update Time : Thu Jun 28 10:17:04 2012
> * * * * *State : active
> *Active Devices : 4
> Working Devices : 4
> *Failed Devices : 0
> *Spare Devices : 0
>
> * * * * Layout : near=2
> * * Chunk Size : 64K
>
> * * * * * UUID : 423fd5cf:beedc018:915808f0:8ec673de
> * * * * Events : 0.845339
>
> * *Number * Major * Minor * RaidDevice State
> * * * 0 * * * 8 * * * 17 * * * *0 * * *active sync * /dev/sdb1
> * * * 1 * * * 8 * * * 33 * * * *1 * * *active sync * /dev/sdc1
> * * * 2 * * * 8 * * * 49 * * * *2 * * *active sync * /dev/sdd1
> * * * 3 * * * 8 * * * 65 * * * *3 * * *active sync * /dev/sde1
>
> Any clues why du shows wrong and floating info?
>
> Best regards,
> Rafal Radecki.
_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
 

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