L2 cache advise needed (SSD)
Posted: Mon Dec 10, 2018 12:13 pm
I'm planning to buy a SSD for L2 use only.
System disk - 1 TB Samsung 860 EVO (SATA 600)
Several HDD that are mainly used for storage.
64GB RAM of which I can dedicate up to 32GB to PrimoCache if needed
I might cache some HDDs but my main focus is on the System disk.
The System disk has to endure lots of small writes from Usenet and some torrenting.
Besides that I obviously have software installed on my System disk. Some of it has database like read activities.
I looking for advise on the following:
- Block size of the L2 SSD
- Specificics about ideal L1/L2 setup.
- Specs of the L2 SSD
The specs of the SSD are most important right now as that's the component I still have buy.
It likely will be a PCIe3x4 SSD.
But what should I focus on? Sequentional speed or random (IOPS) speed.
I know IOPS are important, but I must admit I don't know what the ideal balance between IOPS and sequential speed is.
Does the importance of IOPS get less when using L1 cache?
Or is it better to ditch the whole L2 cache idea and just use the money saved to buy a faster system SSD?
Perhaps another 1 TB Samsung 860 EVO (SATA 600) and stripe them?
(Yeah, I do many backups...)
But I have my reservation on RAID 0. Will it really perform good without a dedicated quality RAID card? Or will it just waste a lot of CPU cycles without decent speed benefit.
That's it. I asked my question. Obviously I would like them to be answered but I'm also open to any other relevant advise.
System disk - 1 TB Samsung 860 EVO (SATA 600)
Several HDD that are mainly used for storage.
64GB RAM of which I can dedicate up to 32GB to PrimoCache if needed
I might cache some HDDs but my main focus is on the System disk.
The System disk has to endure lots of small writes from Usenet and some torrenting.
Besides that I obviously have software installed on my System disk. Some of it has database like read activities.
I looking for advise on the following:
- Block size of the L2 SSD
- Specificics about ideal L1/L2 setup.
- Specs of the L2 SSD
The specs of the SSD are most important right now as that's the component I still have buy.
It likely will be a PCIe3x4 SSD.
But what should I focus on? Sequentional speed or random (IOPS) speed.
I know IOPS are important, but I must admit I don't know what the ideal balance between IOPS and sequential speed is.
Does the importance of IOPS get less when using L1 cache?
Or is it better to ditch the whole L2 cache idea and just use the money saved to buy a faster system SSD?
Perhaps another 1 TB Samsung 860 EVO (SATA 600) and stripe them?
(Yeah, I do many backups...)
But I have my reservation on RAID 0. Will it really perform good without a dedicated quality RAID card? Or will it just waste a lot of CPU cycles without decent speed benefit.
That's it. I asked my question. Obviously I would like them to be answered but I'm also open to any other relevant advise.