Re: [Motion-user] Recording Skip

[Roger H. <rog...@gm...>]

I use an SSD to initially save my images and then daily I move those
images to spinning disks.

Without doing that any slight issue with the disk will cause dropouts.
  An error on the disk will cause a 3-30second blip depending on the
what the disks default timeout is.

this is a sample of smartctl output:
smartctl --xall /dev/sda | grep -iE 'sector|UNC'
Sector Sizes:     512 bytes logical, 4096 bytes physical
  5 Reallocated_Sector_Ct   PO--CK   200   200   140    -    0
197 Current_Pending_Sector  -O--CK   200   200   000    -    0
198 Offline_Uncorrectable   ----CK   200   200   000    -    0
SMART           Log Directory Version 1 [multi-sector log support]
SMART Extended Comprehensive Error Log Version: 1 (6 sectors)
    COUNT  = Count (was: Sector Count) Register
    LL     = LBA Low (was: Sector Number) Register     ]
  40 -- 51 00 00 00 00 bc 9c 57 f8 40 00  Error: UNC at LBA =
0xbc9c57f8 = 3164362744
  40 -- 51 00 00 00 00 55 57 f0 88 40 00  Error: UNC at LBA =
0x5557f088 = 1431826568
  40 -- 51 00 00 00 01 36 58 20 70 40 00  Error: UNC at LBA =
0x136582070 = 5206712432
  40 -- 51 00 00 00 00 47 86 ce 78 40 00  Error: UNC at LBA =
0x4786ce78 = 1200017016
  40 -- 51 00 00 00 01 2b e1 e0 00 40 00  Error: UNC at LBA =
0x12be1e000 = 5031190528
  40 -- 51 00 00 00 00 87 62 10 48 40 00  Error: UNC at LBA =
0x87621048 = 2271350856
SMART Extended Self-test Log Version: 1 (1 sectors)

The realllocated/pending counts rising will cause a several second
blip, and the UNC errors will cause blips.

I have a cron job that saves a log for each disk daily so I can rule
out a disk issue causing a blip.

On Sat, Apr 12, 2025 at 11:05 AM Barry Martin <bar...@gm...> wrote:
>
>
> Hi JMB!
> >
> > Try using 'top' to monitor the system load.  Maybe 'disk' writes (to
> > the NAS) are piling up.  Maybe some background process is consuming
> > excessive CPU?  Did it start after a recent 'sudo aptitude safe-update'?
>
> Will try your suggestions -- right now not sure how to correlate (right
> word?) the time of the skip with top's activity reporting but will
> experiment and learn!  Most Motion recordings are fine (no skip/glitch)
> -- I did forget to mention that originally. Skip/glitch problem has been
> occurred for some time, so can't blame a specific upgrade.
>
> Will report back!
>
> Barry
>
>
>
>
>
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