Re: [RFC PATCH v3 2/5] ndctl: monitor: add ndctl create-monitor command

Hi, > On Fri, Feb 9, 2018 at 12:02 AM, QI Fuli <qi.fuli(a)jp.fujitsu.com&gt; wrote: > > This patch is used to add $ndctl create-monitor command, by which users can > > create a new monitor. Users can select the DIMMS to be monitored by using > > [--dimm] [--bus] [--region] [--namespace] options. The notifications can > > be outputed to a special file or syslog by using [--output] option, the > > special file will be placed under /var/log/ndctl. A name is also required for > > a monitor,so users can destroy the monitor by the name. When a monitor is > > created successfully, a file with same name will be created under > > /var/ndctl/monitor. > > Example: > > #ndctl create-monitor --monitor m_nmem1 --dimm nmem1 --output m_nmem.log > > Hi Qi, > > This is getting closer to where I want to see this go, but still some > architecture details to incorporate. I mentioned on the cover letter > that systemd can handle starting, stopping, and show the status of the > monitor. The other detail to incorporate is that monitor events can > come DIMMs, but also namespaces, regions, and the bus. > > The event list I have collected to date is: > > dimm-spares-remaining > dimm-media-temperature > dimm-controller-temperature > dimm-health-state > dimm-unclean-shutdown > dimm-detected > namespace-media-error > namespace-detected > region-media-error > region-detected > bus-media-error > bus-address-range-scrub-complete > bus-detected > > ...and I think all of those should be separate options, probably > something like the following, but I'd Vishal to comment if this scheme > can be handled with the bash tab-completion implementation: > > ndctl monitor --dimm-events=spares-remaining,media-temperature > --namespace-events=all --regions-events --bus=ACPI.NFIT > > ...where an empty --<object>-events option is equivalent to > --<object>-events=all. Also, similar to "ndctl list" specifying > specific buses, namespaces, etc causes the monitor to filter the > objects based on those properties. Hmmmm.... Currently, I'm confusing what features/options are required for nvdimm daemon. For example, what is use-case of "--bus=ACPI.NFIT"?

For normal administorator of a server, what he/she's interest is "need to replace nvdimm module or not", and "need to backup/restore on the nvdimm module or not".

For normal programs, they just use device name or directory/filename of the filesystem on the nvdimm. To backup thier data, he/she need to solve relationship between nvdimm modules and device name (/dev/pmem* or /dev/dax*). So, IMHO, I suppose "namespace(device name) specifying (or all namespace)" is enough the following events which requires replace the nvdimm module. - spare-remaining - helth-state - media-error And I'm not sure what is use-case of specifying region, bus, and dimm on these events.

In addition, could you tell me what administrator/program can do on the following events? What nvdimm daemon should do on each event? - media-temperature - controller-temperature - address-range-scrub-complete - unclean-shutdown