search for: qd32

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

...my setup, made with fio. > > Firstly a RAID1 array from 2 x WD Black 1TB drives. Second set of figures are the same are for a RAID1 array with the same 2 WD Black 1TB drives and a WD Blue NVMe (PCIe X2) added into the array, with the 2 X HDDs set to --write-mostly. > > Sequential write QD32 > 147MB/s (2 x HDD RAID1) > 156MB/s (1 x NVMe, 2 x HDD RAID1) > > The write tests give near 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...

...ance stats from my setup, made with fio. Firstly a RAID1 array from 2 x WD Black 1TB drives. Second set of figures are the same are for a RAID1 array with the same 2 WD Black 1TB drives and a WD Blue NVMe (PCIe X2) added into the array, with the 2 X HDDs set to --write-mostly. Sequential write QD32 147MB/s (2 x HDD RAID1) 156MB/s (1 x NVMe, 2 x HDD RAID1) The write tests give near 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 RAI...

...me, Xen community. my DomU has very slow Disk performance, despite the usage of SSD''s. Maybe somebody can give some good tips to accelerate, or point out my mistakes. DomU CristalDiskMark 3.0.1 test(roundet): seq (R/W) :71 / 86 MB/s 512k(R/W) :76 / 80 MB/s 4K(R/W) :4 / 3 MB/s 4K QD32(R/W):4 / 4 MB/s The same guest running in KVM-Qemu (standard installed on Ubuntu 12.04) has: seq (R/W) :319 / 146 MB/s 512k(R/W) :306 / 143 MB/s 4K(R/W) :10 / 7 MB/s 4K QD32(R/W):12 / 9 MB/s Need only Xen because of second graphic card pass through (here works fine). I have: intel e...