[GH-ISSUE #40] Split SSD for cache and volume use #6

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opened 2026-03-07 19:19:13 +03:00 by kerem · 2 comments
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Originally created by @Protoncek on GitHub (Apr 27, 2023).
Original GitHub issue: https://github.com/007revad/Synology_M2_volume/issues/40

Hello!
I have ds920+ and i won't be able to create volume officially. So, i wonder, is it possible to use my two SSD's partially for creating volume and rest of space for synology cache? I have 2x500GB SSD's and my syno cache advisor says that i need cache of 250GB. I'd like to have an SSD volume of not more than 100GB for Home Assistant use, rest of space i'd use for cache.

Possible?

Originally created by @Protoncek on GitHub (Apr 27, 2023). Original GitHub issue: https://github.com/007revad/Synology_M2_volume/issues/40 Hello! I have ds920+ and i won't be able to create volume officially. So, i wonder, is it possible to use my two SSD's partially for creating volume and rest of space for synology cache? I have 2x500GB SSD's and my syno cache advisor says that i need cache of 250GB. I'd like to have an SSD volume of not more than 100GB for Home Assistant use, rest of space i'd use for cache. Possible?
kerem closed this issue 2026-03-07 19:19:13 +03:00
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@007revad commented on GitHub (Apr 28, 2023):

I don't think it's possible. DSM won't let you split an NVMe drive into cache and volume. It won't even let you set the storage pool or volume size on a single NVMe drive (it will on a pair of NVMe drives as RAID 0 or 1). If a script created a storage pool with a volume and a cache partition I don't think DSM would mount it or use it.

<!-- gh-comment-id:1527142907 --> @007revad commented on GitHub (Apr 28, 2023): I don't think it's possible. DSM won't let you split an NVMe drive into cache and volume. It won't even let you set the storage pool or volume size on a single NVMe drive (it will on a pair of NVMe drives as RAID 0 or 1). If a script created a storage pool with a volume and a cache partition I don't think DSM would mount it or use it.
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@Protoncek commented on GitHub (Apr 28, 2023):

Yeah, that’s what i feared… thanks for info. And thanks for this script, too. Since ds920 isn’t supported officially it will come handy at a later stage perhaps.
Yesterday i disabled ssd cache only - just for testing, and home assistant pretty much goes to a crawl without it, so it seems that it runs from ssd anyway. I guess i wouldn’t gain much if i create ssd volume to replace current ssd cache anyway.

<!-- gh-comment-id:1527183645 --> @Protoncek commented on GitHub (Apr 28, 2023): Yeah, that’s what i feared… thanks for info. And thanks for this script, too. Since ds920 isn’t supported officially it will come handy at a later stage perhaps. Yesterday i disabled ssd cache only - just for testing, and home assistant pretty much goes to a crawl without it, so it seems that it runs from ssd anyway. I guess i wouldn’t gain much if i create ssd volume to replace current ssd cache anyway.
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