20s+ delay when updating library

Hi,
I run an automatic library update on bootup and approx once per day the update sits on "preparing....0%" for approx 20-25s before anything happens.

After this 20-25s delay it it proceeds as normal (finishes in ~5s). Thereafter I usually can't replicate the delay until a day later.

In this example there is a 22s gap from 20:34:52 until 20:35:14 with no indication of what it's doing for this timeframe. This corresponds to the frozen "Preparing - 0%" dialogue.

Is there any indication here what is causing the delay/hang ? Is it related to CheckIdle - Closing session to addons.libreelec.tv ?

20:34:52.172 T:139828616222464   DEBUG: Getting Directory (special://profile/playlists/video)
20:34:52.177 T:139828616222464   DEBUG: Getting Directory (special://profile/playlists/mixed)
20:34:52.179 T:139828616222464   DEBUG: CMultiPathDirectory::MergeItems, items = 0
20:34:52.181 T:139828616222464   DEBUG: CFavourites::Load - no system favourites found, skipping
20:34:52.181 T:139828616222464   DEBUG: CFavourites::Load - no userdata favourites found, skipping
20:34:52.284 T:139829702293632   DEBUG: ------ Window Init (DialogExtendedProgressBar.xml) ------
20:34:52.300 T:139828616222464  NOTICE: VideoInfoScanner: Starting scan ..
20:34:52.300 T:139829702289152   DEBUG: CAnnouncementManager - Announcement: OnScanStarted from xbmc
20:34:52.300 T:139829702289152   DEBUG: GOT ANNOUNCEMENT, type: 16, from xbmc, message OnScanStarted
20:35:14.585 T:139829702293632    INFO: CheckIdle - Closing session to http://addons.libreelec.tv (easy=0x7f2c64085430, multi=0x7f2c64006ab0)
20:35:15.102 T:139829702293632    INFO: CheckIdle - Closing session to https://raw.githubusercontent.com (easy=0x7f2c900098c0, multi=0x7f2c90008690)
20:35:15.105 T:139829702293632    INFO: CheckIdle - Closing session to http://mirrors.kodi.tv (easy=0x7f2c64075a20, multi=0x7f2c64007d00)
20:35:17.875 T:139828616222464   DEBUG: VideoInfoScanner: Scanning dir 'smb://MY-DESKTOP/Movies 4/' as not in the database
20:35:19.007 T:139828616222464   DEBUG: VideoInfoScanner: No (new) information was found in dir smb://MY-DESKTOP/Movies 4/
20:35:19.019 T:139828616222464   DEBUG: VideoInfoScanner: Skipping dir 'smb://MY-DESKTOP/Movies 4/Movie Name/' due to no change (fasthash)


......etc


20:35:26.434 T:139828616222464  NOTICE: VideoInfoScanner: Finished scan. Scanning for video info took 00:34

I use "wait for network before starting Kodi" so I don't think it's related to that (it never waits for more than 1-2s).
There's no funny add-ons and it's a recently clean install.

Thanks

Quote from Klojum

Do you have one or more sources that are currently unreachable, going into a timeout?
Or do the HDD's of your server need to spin up and fully awake..?

The HDDs which are inside the scope of the library update don't spin down. Also the server doesn't sleep.

I have other HDDs with library content which do spin down but in the Kodi settings these disks are excluded from the library update since they are full and no new content will be added.

So I don't think the delay is related to HDD spin up. Unless there is a bug in Kodi which causes it to query excluded folders during the library update.

But I will test it by disabling spin down entirely on every disk and report back.

Thanks.

Quote from Klojum

Do you have one or more sources that are currently unreachable, going into a timeout?
Or do the HDD's of your server need to spin up and fully awake..?

It looks like you might be correct and the delay is due to Kodi trying to access HDDs which are spun down.

Im not sure why that is though since these spun-down disks are excluded from the update process. And they are already scraped so any posters which pop up on Estuary home screen (random movies etc) should be coming from the local Kodi db.

I have a few ideas of things to check so I will investigate further..