SSD Cache 6 month lifespan?

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stevenb
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SSD Cache 6 month lifespan?

Unread post by stevenb » Fri Dec 29, 2017 4:08 pm

Good morning,

Our RS2416RP+ has managed to chew through 2 Samsung EVO 850's in less than 6 months. The reported lifespan is now around 5% and 12%.

The box is used as an iscsi target for a network share serving about 50 users. The usage is pretty mild compared to our Nimble that does most of the heavy usage stuff.

Anyone having similar issues? Is that really to be expected? I would guess that the SSD's are fine and the software used to predict the lifespan is incorrect. When the replacements come I'll verify how much life is left and report what I find.

Thanks,

Steven

sincarne
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Re: SSD Cache 6 month lifespan?

Unread post by sincarne » Sat Dec 30, 2017 1:40 am

you use consumer SSD for enterprise use. this expected to happen. use SSD with high workload instead

spikemixture
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Re: SSD Cache 6 month lifespan?

Unread post by spikemixture » Thu Apr 12, 2018 5:15 am

stevenb wrote:Good morning,

Our RS2416RP+ has managed to chew through 2 Samsung EVO 850's in less than 6 months. The reported lifespan is now around 5% and 12%.

The box is used as an iscsi target for a network share serving about 50 users. The usage is pretty mild compared to our Nimble that does most of the heavy usage stuff.

Anyone having similar issues? Is that really to be expected? I would guess that the SSD's are fine and the software used to predict the lifespan is incorrect. When the replacements come I'll verify how much life is left and report what I find.

Thanks,

Steven
Hey Steven,

What happened when they went down to 1% or 0%

I have 2 of the same in a 1817+ mine are down to 16 and 14% after 7 months!

I too think its a false reading - but that wont help if they just stop "cache"ing when they get to 1 or 0% !
1815+ - 8x4TB WD Red
1817+ - 2x6TB Ironwolf / 2x 6TB WD Red/ 2x8TB WD / 2x10TB Ironwolf

nasDave40
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Re: SSD Cache 6 month lifespan?

Unread post by nasDave40 » Thu Apr 12, 2018 11:29 pm

They could be programmed to go in to read only mode. I think some Intel SSDs did that. Likely they will continue until failure which is the approach most companies have taken.

SSDs are hoped to fail in a read only state but usually they die a catastrophic death. Hence why Intel opted to prematurely kill their drives and leave them in a read state for date recovery.

SSD cache is a bad solution for most companies. It only works well if you need it desperately and can afford the sacrificial cost every year or two. In these scenarios only enterprise SLC drivers will do.
DS3615xs 32MB, 10G SFP+ => 6xWD red 1TB 2.5 RAID 6 btrfs + 6xSamsung 2TB 2.5 RAID 6 btrfs.

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