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296mb
2020 Sep 17
2
storage for mailserver
Hello Phil,
Wednesday, September 16, 2020, 7:40:24 PM, you wrote:
PP> You can achieve this with a hybrid RAID1 by mixing SSDs and HDDs, and
PP> marking the HDD members as --write-mostly, meaning most of the reads
PP> will come from the faster SSDs retaining much of the speed advantage,
PP> but you have the redundancy of both SSDs and HDDs in the array.
PP> Read performance is
2020 Sep 19
1
storage for mailserver
...hout the SSD in the array as once any cache has been saturated, write speeds are presumably limited by the slowest device in the array.
>
> Sequential read QD32
> 187MB/s (2 x HDD RAID1)
> 1725MB/s (1 x NVMe, 2 x HDD RAID1)
>
> Sequential read QD1
> 162MB/s (2 x HDD RAID1)
> 1296MB/s (1 x NVMe, 2 x HDD RAID1)
>
> 4K random read
> 712kB/s (2 x HDD RAID1)
> 55.0MB/s (1 x NVMe, 2 x HDD RAID1)
>
> The read speeds are a completely different story, and the array essentially performs identically to the native speed of the SSD device once the slower HDDs are set to...
2020 Sep 17
0
storage for mailserver
...r identical performance with and without the SSD
in the array as once any cache has been saturated, write speeds are
presumably limited by the slowest device in the array.
Sequential read QD32
187MB/s (2 x HDD RAID1)
1725MB/s (1 x NVMe, 2 x HDD RAID1)
Sequential read QD1
162MB/s (2 x HDD RAID1)
1296MB/s (1 x NVMe, 2 x HDD RAID1)
4K random read
712kB/s (2 x HDD RAID1)
55.0MB/s (1 x NVMe, 2 x HDD RAID1)
The read speeds are a completely different story, and the array
essentially performs identically to the native speed of the SSD device
once the slower HDDs are set to --write-mostly, meaning th...