Open source raid monitor software#
Open source raid monitor windows#

It often would be enough for consistency check and patrol read but not for battery backed up cache being temporary disabled.Īnother thing you can do is of course switch to another server and take this down for maintenance if this learning process can’t be scheduled when it is non intrusive. This means you already should leave some slack of the system. Learn what cron jobs does your RAID card have and see how they can be controlled – may be schedule them during least busy intervals or something similar.Īlso you should be ready for degraded and rebuild RAID mode – when one of the disk fails and you replace it with another one which needs to be rebuilt. When it wakes up it will some IO resources (30% by default) which will affect your performance some way.Ĭonsistency Checks This is another thing which I’ve seen initiated by controller (though I’m not sure on this one) – which pretty much checks the disks are in sync – this also can slow down performance dramatically.įirst you should not have any of this to come as surprise for you when you discovered your server just stopped performance during the time you planned investor show case or other important event. Patrol Read This is feature which should discover bad sectors before it is too late and it is doing so by doing disk read checks periodically. During this time battery backed up cache will be disabled and system will operate with write through cache possibly slowing down write performance several times. If you have RAID controller this well may not be the case – to protect your data RAID controller may implement bunch of algorithms which can affect performance dramatically.įor example speaking about PERC5 (LSI MegaRaid) – Pretty typical controller from Dell installed on PowerEdge 1950, 2950 etc you should be aware of couple of thingsīattery Learning and Charging Build in Battery has to pass through learning cycle every 3 months or so and this cycle takes about 7 hours according to the docs. There is also database and file system fragmentation however these also tend to accumulate in predictable fashion. This is also almost the case with Hard Drives – there are possible performance differences based on where data is stored on the disk, amount of remapped sectors etc.

Open source raid monitor software#

Typically this is indeed the case, for example CPU will perform with same performance day and night (unless system management software decides to lower CPU frequency due to overheating). Need help monitoring hardware? Contact us.Implementing MySQL database in 24/7 environments we typically hope for uniform component performance, or at least would like to be able to control it. There are not something to alert on, but could be useful for graphing rather than having to eyeball mdadm -detail, and also to get some of the history of the array. When you are recovering/resyncing, node_md_blocks and node_md_blocks_synced can tell you how the array getting synced back up is progressing (and if /proc/sys/dev/raid/speed_limit_max may need a tweak). Node_md_state indicates if the array is recovering using a spare, resyncing after an event such as an unclean shutdown, active and healthy, or disabled and inactive. A RAID1 array with only one active disk is not exactly in prime health after all. Node_md_disks is the primary metric of interest as you will want to know if there are any failed disks, and depending on your the setup you may also know that there must be a minimum number of spares and/or active devices.

Most hardware RAID controllers are not yet supported. For one of my home RAID1 arrays the node exporter produces: # HELP node_md_blocks Total number of blocks on device. Free, downloadable software application developed by Acronis to monitor server, workstation and PC. Cacti require MySQL, Apache, or IIS that support PHP. It works with SNMP and presents the network statistics in the form of easy to understand charts. It is connected to RRDTool, which allows us to generate graphs related to relevant network data.

Open source raid monitor windows#

The Linux software RAID metrics are one of the more intricate metrics in terms of parsing due to /proc/mdstat being more suited to humans than machines, which you can get a sense of from the unittest fixture. Cacti is another open-source network monitoring tool that can be installed on Linux or Windows OS.