When some items is not fetched!

[nima0102]

Hi
Unfortunately sometime a few item are not fetched, and those items are not updated.
On UI where can I check these errors??I think zabbix must gives alert on error item fetching !!
Another problem is about "retry item", By default how many does zabbix retry when zabbix gets error on item fetch??
How can I set number of retry?

Thanks for any help or guidance

[nima0102]

Is there any reply on this problem ?

Thanks in advance

[jerrylenk]

details?

1 There can be any number of reasons, why some items get no data. Can you give some details?
What items? What monitored devices? and the like.

2 You can create a Trigger with function 'nodata' to alert you when an item is no longer fetched -- which will, of course, only be useful if it was fetched before.

3 If an item has turned 'unsupported', that is, zabbix agent has replied "I cannot give that data", the server keeps retrying that item to see if it becomes available again.
There is no limited number of retries, the retries are done less often than the normal poll period though.

Jerry

[nima0102]

Hi
Thanks for your attention
My items are related to cpu.and devices are linux server.
Items are fetched without any problem.but some times few item is not fetched.I think If I can set number retry to higher number than default parameter the issue will be solved.
Unfortunately I could not still find this option on Zabbix for items.

Thanks for more help or guidance

[jerrylenk]

Looking at my zabbix_server log, it looks like it retries eight times / 2 min
to contact a device that has gone offline from the network, after which zabbix assumes it is off (and still checks, but less frequent).

These times and periods can be configured in zabbix_server.conf with parameters: UnreachablePeriod, UnreachableDelay and UnavailableDelay.
But this was a host going completely offline, not just a single item that failed.

I would expect in this case, zabbix simply waits until the next regular interval to check this item, as configured in the item itself.
Maybe in your case it helps to increase the timeout parameter (in zabbix_server.conf), by default 3 s, after which the server closes the connection if the agent does not reply quickly enough.
Only I don't know what to expect if you check CPU load every 5 s and have zabbix wait for longer than that, so one request overlaps with the previous one. ;D

Jerry

[nima0102]

Thanks for your reply.
I think zabbix_server create new connection for getting items,for example, for fetching 20 items of one host, zabbix_server create 20 tcp connections.Is that true?if so, Is this mechanism optimized ?it's better that zabbix_server create one connection to given host and then in that connection request all of items, in this case all items surely will be fetched.

Thanks for any hep or guidance

[jerrylenk]

I really don't know. You would have to ask a zabbix developer for the details on commuication.

With zabbix_sender is is possible to send a number of item values in one go, from a text file.
But what exactly the agent does,

Jerry

[nima0102]

Thanks for your reply
I will be happy if zabbix's developers respond to these issues.

Thanks in advance

[jerrylenk]

Also, you may want to have a look at zabbix wiki.

[nima0102]

If item is not updated, one value supposed to this situation

Hi
Hello again
I do not know why when zabbix does not fetch one item, does not insert any data to related table of that item!for example, if zabbix could not update the item inserts "no_updated" to list of value for that item.
This is big problem when item is one of items in calculated items!if one of items is not updated,in calculating old value of that item is used.
I think zabbix must insert to list of value if one item is not updated!!Maybe I do not have enough knowledge.

Thanks for any help or guidance

[nima0102]

Hi
Hello again
I do not know why when zabbix does not fetch one item, does not insert any data to related table of that item!for example, if zabbix could not update the item inserts "no_updated" to list of value for that item.
This is big problem when item is one of items in calculated items!if one of items is not updated,in calculating old value of that item is used.
I think zabbix must insert to list of value if one item is not updated!!Maybe I do not have enough knowledge.

Thanks for any help or guidance

Is there any suggestion??

Thanks