Pasi, The software is proprietary, but can run on most 64-bit Linux systems in a server setting. It also works wonders with "embedded Flash" (SD, eMMC, USB, etc.) for 32-bit x86 and ARM systems. Please send me a direct email, off-list, and I can give you more details. Doug Dumitru On Fri, Dec 30, 2016 at 8:32 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote: > Hello, > > On Thu, Dec 29, 2016 at 05:24:16PM -0800, Doug Dumitru wrote: >> >> My test is of a "managed" array with a "host side Flash Translation >> Layer". This means that software is linearizing the writes before >> RAID-5 sees them. This is how the major "storage appliance" vendors >> get really fast performance. One vendor, running an earlier version >> of the software I am running here, was able to support 5000 ESXI VDI >> clients from a single 2U storage server (with a lot of FC cards). The >> boot storm took about 3 minutes to settle. >> > > Does this software happen to be opensource / publicly available ? > > > Thanks, > > -- Pasi > >> Single drives are around 500 MB/sec which is 125K IOPS through our >> engine. Eight drives are (8-1)x500=3500 MB/sec or 900K IOPS. This is >> actually faster than FIO can generate a test pattern from a single >> job. It is also faster than stock RAID-5 can linearly write without >> patches. >> >> In terms of wear, lots of users are running very light write >> environments. This is good as many configurations are > 50:1 write >> amp if you measure "end to end". By end to end, I mean, how many >> flash writes happen when you create a small file inside of a file >> system. This leads to "file system write amp" x "raid write amp" x >> "SSD write amp". Some people don't like this approach as the file >> system is often "off limits" and a black box. Then again, some file >> systems are better than others (for 10K sync creates, EXT4 and XFS are >> both about 4.4:1 whereas ZFS is a lot worse). And with EXT4/XFS, you >> can mitigate some of this with an SSD or mapping layer that compresses >> blocks. >> >> Doug Dumitru >> > -- Doug Dumitru EasyCo LLC -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
