Jan-Otto Kröpke
d819362150
Every optional collector of the mixin now has alerts, generated only with that collector enabled in _config.collectors: clock source, disk drive status, page file usage, license status, scheduled task results, pending updates, Hyper-V WMI and replication health, failover cluster nodes, resources, groups and shared volumes, Storage Spaces pool and virtual disk health, DHCP scope exhaustion and DNS zone transfer failures. The alerts of the pagefile, diskdrive and license collectors join the memory, disk and system groups; the other collectors get a group of their own. New knobs: taskSelector, sharedVolumeSelector, pagefileUsageThreshold, dhcpScopeFreeWarningThreshold, dhcpScopeFreeCriticalThreshold and updatePendingDuration. The test configuration enables every optional collector and tests/optional.test.yaml covers the new alerts. Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>
1.7 KiB
title
| title |
|---|
| WindowsPagefileAlmostFull |
Meaning
The page file file has been more than the configured share in use for 15
minutes. The default pagefileUsageThreshold is 80 percent of
windows_pagefile_limit_bytes, the current size of the file. The alert needs
the pagefile collector. A system-managed page file grows up to its maximum
when it fills, so a high usage of the current size on such a system shows that
the file has already grown.
Impact
When the page file is full, Windows cannot commit more memory. Allocations fail, processes crash with out-of-memory errors, and the system can become unresponsive. The commit limit alert WindowsMemoryCommitHighUsage usually fires at the same time.
Diagnosis
-
Compare
windows_pagefile_free_bytesandwindows_pagefile_limit_byteswithwindows:memory_committed:ratioandwindows_memory_available_bytesto see whether physical memory is exhausted too. -
Find the processes that hold the commit charge:
Get-Process | Sort-Object PagedMemorySize64 -Descending | Select-Object -First 10 Name, Id, @{n='CommitMB';e={[int]($_.PagedMemorySize64/1MB)}} Get-CimInstance Win32_PageFileUsage | Select-Object Name, AllocatedBaseSize, CurrentUsage, PeakUsage -
Check for a recent change: a new workload, a memory leak that grows over days, or a page file that was made smaller or fixed in size.
Mitigation
Stop or restart the process that leaks memory, or move workload off the host. Add physical memory or enlarge the page file through the normal change process; a fixed page file needs enough room for the peak commit charge of the host. Confirm usage falls below the threshold and stays there.