Both disk on mirror raid failing - Advice

TrueNAS General
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(Semi new to truenas - did research and would like advice still)

In a situation where bought new (from amazon) Sata SSD (2x 256gb) to use for Apps in mirror, not even 2 days in both started to report signs of failing as shown below:

197 Current_Pending_Sector = 11
196 Reallocated_Event_Count = 55
175 Program_Fail_Count_Chip = 84,082,689
176 Erase_Fail_Count_Chip   = 2711
178 Used_Rsvd_Blk_Cnt_Chip  = 134,217,728
etc..

Now bought 2 Intel D3-S4510 (240gb) as replacement and wondering how should i go with replacing them? Offline one, replace wait for the scrub to be done and replace other? Will the size difference not be a problem? Is there any risk of replacing?

Sorry if this is vague but unsure how to phrase it, thanks in advanced <3

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Going to smaller devices is a problem. Full hardware details may be helpful as I can’t tell if you can have everything installed at once. Depending on what apps you have, it may be easier to just document your app setup, remove all apps, change out drives and make a new pool and start over installing apps

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Details:
25.10.1 - Goldeye
Gigabyte A520M DS3H V2
AMD Ryzen 5 5600XT
32GB DDR4 3200
Patriot P300 M.2 - Boot
Vansuny X12 256GB SATA SSD x2 (Mirror) - Apps Failing drives
Seagate Enterprise 3.5 HDD v5 4tb x3 (RAIDZ1) - Storage

Apps Dataset:
Using the Vansuny X12 256GB SATA SSD x2 in Mirror in a single VDEV.
Truenas is not reporting any health problems but in Scrutiny and smartctl those failures are cropping up.

The drives i want to replace with are 2x Intel (SSDSC2KB240G8) - 240GB D3-S4510 Series

Uses/Question:
The apps is primarily Dev stuff ie databases, homepages, bots, arr setup etc.

May be incorrect, read on forums, if zfs mirror is setup it uses lowest capacity drive for total capacity - would that be possible to do or would that be too risky?

First time forum’er, happy to provide any detail what was missed as uncertain what information is needed. Really do appreciate the response :slight_smile:

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That’s five SATA drives but the board only supports four, so something is not right…

Not possible. ZFS aligns a vdev to smallest member upon creation; once created, you can NOT expand or replace with a smaller drive.

Export the HDD pool to free SATA ports if needed.
Then plug in the two new drives, and add them as a second mirror vdev to your app pool and remove (from GUI!) the first mirror vdev: This will cause ZFS to migrate the data.

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Forgot to mention i do have a HBA LSI 9207-8i . (8 SATA connectors)

Thanks for the clear instructions, takes the worries of my shoulder!
Will give that a try once new drives arrive :slight_smile: