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Motherboard suggestions for 2.5 intel ssd dc p4500 nvme
- Thread starter redcar
- Start date
ChrisReeve
Explorer
- Joined
- Feb 21, 2019
- Messages
- 91
First of all, I'm not sure if you need SLOG if you are going to run 4x P4500 in a pool. SLOG is only beneficial for synchronous writes. Most "typical" usecases, like SMB shares, jails, will do asynchronous writes, which means the SLOG will not do anything at all.
For example, my usecase for SLOG is running VMs off of an iSCSI running on a RAIDz2 HDD pool. Hard drives have poor sync write performance (Stux' testing shows write performance as low as 5 MB/s without SLOG), which is a usecase where you will see huge benefits from a SLOG device. But as you already mentions, you absolutely need power loss protection, which your P4500 drives have, but most consumer SSDs do not have.
Also, I am unsure if you actually need SLOG at all when running an SSD pool. SSDs are performant for sync writes as well (which is why they are used as SLOGs in the first place), as opposed to hard drives. This means that the only potential performance boost from a SLOG will be for sync writes, again, which most usecases are not, and in this case, the performance boost will be far less substantial than if your pool was hard drive based.
My main usecase is just storing/accessing a large media library, a usecase where I see no performance increase at all (as expected). For running VMs off the same pool (RAIDz2), I see huge performance gains, but I have chosen not to do this anyways, as this makes every VM dependant on freeNAS being online).
For example, my usecase for SLOG is running VMs off of an iSCSI running on a RAIDz2 HDD pool. Hard drives have poor sync write performance (Stux' testing shows write performance as low as 5 MB/s without SLOG), which is a usecase where you will see huge benefits from a SLOG device. But as you already mentions, you absolutely need power loss protection, which your P4500 drives have, but most consumer SSDs do not have.
Also, I am unsure if you actually need SLOG at all when running an SSD pool. SSDs are performant for sync writes as well (which is why they are used as SLOGs in the first place), as opposed to hard drives. This means that the only potential performance boost from a SLOG will be for sync writes, again, which most usecases are not, and in this case, the performance boost will be far less substantial than if your pool was hard drive based.
My main usecase is just storing/accessing a large media library, a usecase where I see no performance increase at all (as expected). For running VMs off the same pool (RAIDz2), I see huge performance gains, but I have chosen not to do this anyways, as this makes every VM dependant on freeNAS being online).
I'm going to use this for file sharing, backup, osx time machine backups. I have a router to deal with the other things jails most commonly used.
www.ixsystems.com
Had to google that.
I'm looking to move large files quickly on and off the freenas. Then at night have an off site amazon glacier backup run if possible.
It seems I could use RAIDz2 as the drives are so fast?
What I'm confused on is do I need a raid card or does freenas do this?
Thanks for the input!
A Quick Intro to Jails
Disclaimer: I'm going to oversimplify some complicated things, and I'm going to use small lies in order to make this more understandable. For the people that really understand this stuff, try very hard to resist your compulsion to correct the purposeful imprecision and white lies. This is...
www.ixsystems.com
Had to google that.
I'm looking to move large files quickly on and off the freenas. Then at night have an off site amazon glacier backup run if possible.
It seems I could use RAIDz2 as the drives are so fast?
What I'm confused on is do I need a raid card or does freenas do this?
Thanks for the input!
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