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March 3rd, 2021 07:00

SC8000/SCOS 7.3 - Thin/thick and used space mismatch

Hi!

My servers use an old version of Linux, before SCSI UNMAP or TRIM was possible. I cannot upgrade the Linux version.

I upgraded to 7.3 from a very old SCOS version and my problem began.

I noticed 99% usage on my volumes, with my filesystem reporting just below 50%. I strongly believe this is due to thin provisioning in the SCOS volumes.

How can I disable the thin provisioning in the volumes? I have more than enough storage for my application.

Thank you!

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9.3K Posts

March 3rd, 2021 11:00

Hi dromedary1st,

It doesn’t look like we have the manual for 7.3 up anymore, but here are the steps on 2019 https://dell.to/3bYTpRt

 

 

March 3rd, 2021 23:00

Thank you very much, Josh!

Unfortunately, those instructions only apply to FS systems on NAS mode.

My question is how to do this on my SC8000 

Thanks again!

Moderator

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7.6K Posts

March 4th, 2021 09:00

Hello dromedary1st,

Which version of SCOS were you running prior to you upgrading to 7.3?  All volumes on a compellent are thin provisioned. You can’t set them as thick as that is only for NAS systems that you can set them as thin or thick.  Have you enabled data reduction on your SC8000?  You can find data reduction on page 133 of this link. https://dell.to/3rgzV1e

March 8th, 2021 05:00

Thank you very much for your attention, Sam! It's appreciated

I cannot confirm the exact SCOS version right now, but I can confirm it was dated 2012 (because of a login screen copyright image). So, I guess either 5 or an early 6 maybe?

Either way, has this behavior changed along SCOS versions? Were volumes not thin-provisioned back in the SCOS 5 era?
If so, I may have an answer to why this problem appears now. That may explain why my kernel, which cannot do UNMAP/TRIM, worked just fine before.

Thank you!

 

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9.3K Posts

March 8th, 2021 09:00

I haven’t been able to find release notes that far back to confirm but it wouldn’t surprise me if that is the difference.

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