Hello,

"[email protected]" <[email protected]> writes:

> What you're saying is making sense, but the issue comes from the
> changelog reader's usage.

Perfect. Thanks for the detailed explanation. It all makes sense now.

Since my previous mail, I've been experimenting a bit, and changed the
server where I install Robinhood, so now the database is stored in a SSD
and I use MariaDB (as opposed to HDD + MySQL in the previous
attempt). I'm performing now the initial scan and I can see that it is
going faster, but I assume the real test will be later, trying to
measure the speed of queries.

In any case, I'm about to start playing with policies. Basically I want
to be able to keep our system below 90%, by deleting old files when we
reach that threshold, and later on I'll probably have some questions
about that, but now I've some strange result from trying to check some
details of some files. I tried the "rbh-report --oldest-files", but to
my surprise it reported files accessed in 2007 (we didn't have that
system yet). I tried then with the "--reverse" option and I got results
which access times in 2050! If I check the stats for one of those files
you see that Robinhood reports access and modification times in 2050,
while "stat" reports pretty crazy stuff for the modify time.

Since the policy that I want to implement would take into account last
access time this is not ideal. Does this mean that my Lustre file system
is corrupt in some way? (I was performing queries while the initial scan
was being performed. Is that safe or did I go into dangerous territory?)
Any pointers on how to debug/avoid these wrong data?


Robinhood stats
===============

$ sudo /scratch/angelv-adm/robinhood/robin/sbin/rbh-report -f 
/etc/robinhood.d/basto.conf -e 
/storage/WIPEOUT_JAN31/BACKED_UP/martinlc/backup_portatil/home/martinlc/.cache/mesa_shader_cache/70/cd1e3cd724a4085d417bcda03b5be4e8417f41
id             :        [0x20000cf4d:0x6a64:0x0]
parent_id      :        [0x20000cf33:0x714c:0x0]
name           :        cd1e3cd724a4085d417bcda03b5be4e8417f41
path updt      :        2026/01/26 16:24:40
path           :        
/storage/WIPEOUT_JAN31/BACKED_UP/martinlc/backup_portatil/home/martinlc/.cache/mesa_shader_cache/70/cd1e3cd724a4085d417bcda03b5be4e8417f41
depth          :        9
user           :        martinlc
group          :        tmgs-old
projid         :        ?
size           :        1.17 KB
spc_used       :        4.00 KB
creation       :        2024/11/22 14:17:54
last_access    :        2050/06/12 21:10:19
last_mod       :        2050/06/12 21:10:19
last_mdchange  :        2024/11/22 14:17:54
type           :        file
mode           :        rw-r-----
nlink          :        1
md updt        :        2026/01/26 16:24:40
invalid        :        no
fileclass      :        small_files
class updt     :        2026/01/26 16:24:40
stripe_cnt, stripe_size,      pool:              1,     1.00 MB,          
stripes        :        ost#21: 4375333
lhsm.status    :        new
lhsm.archive_id:        0
lhsm.no_release:        no
lhsm.no_archive:        no
lhsm.last_archive:      0
lhsm.last_restore:      0

"Stat" stats
============

$ sudo stat 
/storage/WIPEOUT_JAN31/BACKED_UP/martinlc/backup_portatil/home/martinlc/.cache/mesa_shader_cache/70/cd1e3cd724a4085d417bcda03b5be4e8417f41
  File: 
/storage/WIPEOUT_JAN31/BACKED_UP/martinlc/backup_portatil/home/martinlc/.cache/mesa_shader_cache/70/cd1e3cd724a4085d417bcda03b5be4e8417f41
  Size: 1203            Blocks: 8          IO Block: 4194304 regular file
Device: f96638d6h/4184226006d   Inode: 144116078425959012  Links: 1
Access: (0640/-rw-r-----)  Uid: ( 1518/martinlc)   Gid: (   60/tmgs-old)
Access: 2025-12-16 16:06:14.000000000 +0000
Modify: 2186-07-20 03:38:35.000000000 +0100
Change: 2024-11-22 14:17:54.000000000 +0000
 Birth: -


Many thanks,
-- 
Ángel de Vicente
 Research Software Engineer (Supercomputing and BigData)
 Tel.: +34 922-605-747
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