wrong disk size

[pr0d1gy]

Hi ,
I am new with Zabbix so I am sure I have a way to fix it but I couldn't find a solution yet .
I receiving data from a Centos6.6 server on Zabbix 3.0.1 "Template SNMP OS Linux " .
the problem is the data disk size is completely wrong .

	Allocation units for storage /stornext/Vault	4 KB
	
		Total disk space on /stornext/Vault 1.48 TB
		Total disk space on /stornext/Vault in units 398.24 Munits
		Used disk space on /stornext/Vault 4.21 TB
		Used disk space on /stornext/Vault in units 1.13 Gunits

while df -h /stornext/Vault/ on server shows

Filesystem           Size  Used Avail Use% Mounted on
/dev/cvfsctl4_Vault   66T   37T   30T  56% /stornext/Vault

what am I missing ? is there any parameter I need to change to get the right results ?

Kind regards ,
Pr0

[glebs.ivanovskis]

Seems like you are using 32 bit counters. Use 64 bit instead! With 4 KB block size 32 bit counter for blocks will be exhausted at 16 TB of storage space.

[pr0d1gy]

Seems like you are using 32 bit counters. Use 64 bit instead! With 4 KB block size 32 bit counter for blocks will be exhausted at 16 TB of storage space.

Hi,

thanks for your reply .
I understand what are you saying but how do I implement it in zabbix?
is it done by changing one of the parameters ?

Regards ,
Pr0

[pr0d1gy]

I really wonder ,
I am the only one who bumped this issue ? no one seen it before ?

Regard,
pr0d

[kloczek]

I really wonder ,
I am the only one who bumped this issue ? no one seen it before ?

Very possible because monitoring Linuxes over SNMP isn't best method of doing such things.
Zabbix standard agent offers much better platform (uses less memory, consume much less CPU power and offers much better flexibility of monitoring anything without changing agent set up) .

[pr0d1gy]

Very possible because monitoring Linuxes over SNMP isn't best method of doing such things.
Zabbix standard agent offers much better platform (uses less memory, consume much less CPU power and offers much better flexibility of monitoring anything without changing agent set up) .

Thanks for your reply .
I must say I have the same problem with zabbix agent over Mac .

df -H on machine :

admins-Mac:~ admin$ df -H
Filesystem                                  Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk0s2                                 68G    13G    55G    20% 3275099   13418137   20%   /

while zabbix monitor it :

	Filesystems (6 Items)
	Free disk space on /
vfs.fs.size[/,free]	60	7	365	Zabbix agent	2016-07-03 17:10:33	51.19 GB	-4 KB	Graph	
	Free disk space on / (percentage)
vfs.fs.size[/,pfree]	60	7	365	Zabbix agent	2016-07-03 17:10:34	80.69 %		Graph	
	Free inodes on / (percentage)
vfs.fs.inode[/,pfree]	60	7	365	Zabbix agent	2016-07-03 17:10:32	80.38 %		Graph	
	Total Disk Size of /
diskSize[/]	5	90		Zabbix agent	2016-07-03 17:10:54	0 2 68 13 55 20 3275105 13418131 20		History	
	Total disk space on /
vfs.fs.size[/,total]	3600	7	365	Zabbix agent	2016-07-03 17:10:00	63.68 GB		Graph	
	Used disk space on /
vfs.fs.size[/,used]	60	7	365	Zabbix agent	2016-07-03 17:10:36	12.25 GB	+4 KB	Graph

as you can see 68GB of disk monitored as 63.68GB
free space of 55GB monitored as 51.19GB
consider monitoring TB sized and the offset will be huge .

what can be wrong ?

[kloczek]

as you can see 68GB of disk monitored as 63.68GB
free space of 55GB monitored as 51.19GB
consider monitoring TB sized and the offset will be huge .

what can be wrong ?

I have no idea.
You should try to observe 'zabbix_agentd - "vfs.fs.size[/,free]"' running this command over truss to observe which one syscalls is using zabbix agent and what results are returning those syscalls on sampling disk space metrics.
If you will find anything odd here just open a ticket on support.zabbix.com

[glebs.ivanovskis]

what can be wrong ?

Nothing is wrong. df -H shows gigabytes, Zabbix shows gibibytes.

[pr0d1gy]

Thanks for the heads up !

now it's more strange .
zabbix_get shows the right size

zabbix_get -s 172.16.50.82 -k vfs.fs.size[/,free]
54960041984

i't just the Latest Data monitor shows it wrong .
as far as I've tested seems zabbix_get get it's size like running df -H

df -H
Filesystem                                  Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk0s2                                 68G    13G    55G    20% 3279014   13414222   20%   /

while the latest monitor get it's result like running df -h

admins-Mac:~ admin$ df -h
Filesystem                                  Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk0s2                                64Gi   12Gi   51Gi    20% 3279012   13414224   20%   /

do you think I should open a ticket on it or there is some macro change I need to do?

Regards.

[pr0d1gy]

Nothing is wrong. df -H shows gigabytes, Zabbix shows gibibytes.

Ok
how can I make zabbix show size in gigabytes ?

Regards ,

[glebs.ivanovskis]

do you think I should open a ticket on it or there is some macro change I need to do?

There is no indication of a bug. Agent returns size in bytes, value is stored in DB in bytes, frontend uses 1024 as a kilo multiplier for bytes. The only thing is that frontend confuses users with K, M, G instead of Ki, Mi, Gi in this case and there are several related issues you can vote for:

• https://support.zabbix.com/browse/ZBX-5764
• https://support.zabbix.com/browse/ZBX-1273
• https://support.zabbix.com/browse/ZBXNEXT-954

And you can use a custom multiplier if you prefer GB to GiB.

[pr0d1gy]

Thanks

can you point me how to custom multiplier it into GB ?
is there any manual for that?

Regards,

[glebs.ivanovskis]

Look here for "Use custom multiplier".

[pr0d1gy]

Hi Glebs ,

I am almost there tho I get the same result .
I put "B" in Units and 1024 in Use custom multiplier
and still getting 63.68GB.
do you have a clue what is the right custom multiplier I need to write ?

Regards ,

[DmitryL]

He Pr0d1gy,

Please try this item configuration:


Best regards,
Dmitry