eMMC Write endurance

mcury

What drive did you end up putting in?

I got a WD SN520 (2242), I had to install a little heatsink because it was hitting 75+ Celsius..

So, keep attention to the drive temps, and in case you need a heatsink, get a thin one because you won't have much space..

nkull

@mcury That's toasty... I've got a 2280 coming of the same drive. Have a link to the heatsink you used? Looks like it's helping from your post above.

mcury

@nkull

When I was closing the box, I noticed that the heatsink was touching the box.. So I don't recommend the one I'm using..

If you get one, check the thickness and in case it touches the box, don't force it..

Cabledude

@SteveITS said in eMMC Write endurance:

@nkull Hmm, normally 512 and 1024 as I recall. Check /var and /tmp usage in the disk widget, it has to fit.

Hi @SteveITS I went from 1100 to 2100 Max with 128GB SSD, precisely because of eMMC longevity concerns. So with the SSD I should be safe. However...
As I have 4GB of RAM, which is mostly < 25% usage, would my 2100 benefit from also adding a RAM drive?

The SSD has under 5G allocated and 110G free
I use the following packages:

avahi, dpinger, kea-dhcp4, kea-dhcp6, ntpd, openvpn, pfBlockerNG (with logs), radvd, syslogd, unbound DNS Resolver

Thank you.

stephenw10

With pfBlocker-ng running you will likely need some pretty large RAM drives. That depends on the how many lists you have active though.

SteveITS

@Cabledude Concur memory use is list/situation specific. We rarely get to 1GB usage for pfSense.

Pros: bit faster temp files, logging

Cons: Lose up to an hour (per settings) of data at power loss

Cabledude

Hi @stephenw10 and @SteveITS,

Thanks for your recommendations. The basis question was rather: would the 128GB SSD benefit (have extended life) if RAM disk is used?

stephenw10

Yes. But the write cycle life on any recent SSD is likely to outlive the usefulness of the device anyway. So I'd question the value in doing so.

patient0

After reading through this thread I checked the eMMC health of the used SG-1100 I bought two weeks ago ... and it is not looking great (but Pre EOL is still ok):

mmc extcsd read /dev/mmcsd0rpmb | egrep -i ^emmc
eMMC Firmware Version: 73103517
eMMC Life Time Estimation A [EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A]: 0x08
eMMC Life Time Estimation B [EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B]: 0x0b
eMMC Pre EOL information [EXT_CSD_PRE_EOL_INFO]: 0x01

I'm running the SG-1100 in my lab with 24.03 on ZFS with RAM disk enabled, standard log of firewall disabled and nothing disk heavy running. Is it recommended to re-install but with UFS to extend the life of the device?

Cabledude

@patient0 I’m not qualified to advise but based on the discussions above UFS appears to be milder on the eMMC. You will obviously lose ZFS functionality which may not be an issue for your setup.

May I ask which RAM disk sizes you chose and did you monitor RAM disk usage stats?

Thanks,

patient0

@Cabledude I have just enabled the RAM disk so I can't say much for now.
And for the RAM disk size I choose /tmp 120MB and /var 160MB (I pulled this numbers out of the thin air). And will adjust them if I run into issue, it's only the lab.

stephenw10

Enabling RAM disks in ZFS does reduce drive writes significantly. But it's still higher than UFS with RAM disks.

The new Net Installer can install to a second USB drive in the 1100 allowing pfSense to run from that should the eMMC fail.

patient0

@stephenw10 I reinstalled the SG-1100 now on UFS with RAM disk and if eMMC fails I'll use an USB stick or disk, that'll do, thanks.

kenw

I have:

SG-1100, about 4 years old using ZFS
24.03-RELEASE (arm64)
built on Mon May 13 8:17:00 EDT 2024
FreeBSD 15.0-CURRENT
Only eMMC write intensive package is nmap which is run on demand infrequently.

Just checked my pfsense and found:

eMMC Firmware Version: 73103517
eMMC Life Time Estimation A [EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A]: 0x06
eMMC Life Time Estimation B [EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B]: 0x0b
eMMC Pre EOL information [EXT_CSD_PRE_EOL_INFO]: 0x01

Not sure how long Estimation B has been at 0x0b, but guess I'm living on borrowed time. I've bought a mini pc and will be running pfsense on that as soon as it comes in.

Any other suggestions are welcome

stephenw10

Enable RAM disks to minimise drive writes.

You can now install to a USB drive and run from that if it fails.

Cabledude

@stephenw10 said in eMMC Write endurance:

The new Net Installer can install to a second USB drive in the 1100 allowing pfSense to run from that should the eMMC fail.

Would it also be possible to attach a USB-powered SSD?

stephenw10

Theoretically yes. Though it's not something I've tried.

Cabledude

@stephenw10 said in eMMC Write endurance:

Theoretically yes. Though it's not something I've tried.

I will try it for you as soon as I have some time

beckp

Running pkg install mmc-utils on a SG-1100 gives me an error.
ld-elf.so.1: Shared object "libssl.so.30" not found, required by "pkg"
What did I do wrong?
Also tried pkg install -y mmc-utils; rehash per the Troubleshooting Disk Lifetime webpage. Same error.

stephenw10

Library errors like that usually imply it's using a pkg built for a different version.

So check your pfSense update branch matches the current version.