SSD read/write - how long will it last

keyser

@michmoor If you look closelt in that report, it says %used = 3%
So there is lots and lots of life left in your SSD :-)

michmoor

@keyser you sure percentage used isn’t taking about disk space?

keyser

@michmoor said in SSD read/write - how long will it last:

@keyser you sure percentage used isn’t taking about disk space?

Well, pretty much 100%. The SSD itself cannot know how much diskspace the OS considers allocated and used - especially not if the OS does not support TRIM. Also, the S.M.A.R.T. Health tools always reports on the actual physical state of the SSD, not the filesystem state on the SSD.

SteveITS

@adriftatlas said in SSD read/write - how long will it last:

  PID USERNAME     VCSW  IVCSW   READ  WRITE  FAULT  TOTAL PERCENT COMMAND
    6 root      2207881  26057    313 1142462      0 1142775  82.97% zfskern

WRITE is a counter, I believe? So it should increment forever. I pulled up a router on 2.6 with ZFS and see 5315859 (incrementing slowly) but that's 284 days of uptime. zfskern should include the ZFS scrub.

What does iostat -x show? On that same router, which is also using a RAM disk, I see:

: iostat -x
                        extended device statistics
device       r/s     w/s     kr/s     kw/s  ms/r  ms/w  ms/o  ms/t qlen  %b
ada0           0       0      0.0      1.2     6     0    24     3    0   0
cd0            0       0      0.0      0.0     0     0     1     1    0   0
pass0          0       0      0.0      0.0     4     1    79    22    0   0
pass1          0       0      0.0      0.0     0     0     0     0    0   0

Dobby_

I would go with a small RaspBerry PI 3/4 with 2/4 GB and a
big mSATA or M.2 SSD with TRIM support as a logging server.

AdriftAtlas

                        extended device statistics  
device       r/s     w/s     kr/s     kw/s  ms/r  ms/w  ms/o  ms/t qlen  %b  
da0            0      11      2.1    149.9     0     0     5     1    0   0 
pass0          0       0      0.0      0.0     0     0     0     0    0   0

I'd like to understand what is writing though. I'd rather not resort to using a RAM disk as it can cause other issues. There is no reason anything should be writing that much on a mostly idle router.

keyser

@adriftatlas The usual HUGE suspects are pfSense add-on packages (in order of typical write activity:)

1: Suricata
2: Snort
3: pfBlockerNG (especially with reply logging turned on)
4: NtopNG

All of them has measures to manually configure how much (or little) logging they actually do.

SteveITS

@adriftatlas Hmm yeah that’s 149x more. Not that I have a comparison handy.

Re:suspects, also any package mentioning SSD here:
https://www.netgate.com/supported-pfsense-plus-packages

AdriftAtlas

The only thing I have installed that could be chatty is pfBlockerNG. Even then I only use the Geo IP blocking aliases.

mcury

I get 49 kw/s, and I'm using pfblockerNG (not logging DNS replies) and remote syslog (with logging to the firewall disabled).
Based on the other thread, the count would be: 49 x 60 x 60 x 24 x 365 = 1545264000
Which is 1.5 TB per year.
My SSD, ADATA M.2 SATA SU650 120GB can write 70TBW, so based on that, I would be able to use it for around 45 years.