ulisses1478 Posted May 16, 2019 Share Posted May 16, 2019 (edited) I have an OSX Sierra VM and I installed on a unassigned device with raw .img and Im having VERY slow write speeds. I start the disk speed test and the speeds are great like 500mb/s but in seconds it drops to 80mb/s and 60mb/s and going down until get read at 8mb/s and writes at 6.2mb/s. I already tried to chance cache from writeback to none and unsafe and native IO the start perfomance is the best with io='native' on the disk but it get slow after during the test. Edited June 1, 2019 by ulisses1478 fixed the problem an d posted the solution Quote Link to comment
trurl Posted May 16, 2019 Share Posted May 16, 2019 9 hours ago, ulisses1478 said: the disk speed test Are you referring to the diskspeed docker? https://forums.unraid.net/topic/70636-beta-6a-diskspeed-hard-drive-benchmarking-unraid-6/ Or is this some disk speed test you are performing in the VM? Quote Link to comment
ulisses1478 Posted May 17, 2019 Author Share Posted May 17, 2019 I'm performing a disk speed test in my VM Quote Link to comment
cheww Posted May 23, 2019 Share Posted May 23, 2019 I'm having the exact same issue. Except i am passing the SSD through and not using an image. ( Prim vdisk location --- Manual - /dev/drive/by-id/ata-ct480bx500etcetc) Mine starts fast at 100MB/s then drops after 10 seconds to 80MB/s then 40MB/s then to 0MB/s Then back up again for 4 seconds then drops back down until the file finished. By accident (didn't realise i could do this) booted into the drive bypassing unraid. Did the same test and same thing happened. Tried different Sata slots, Cables, Different drives (both same model Crucial BX500) I plan on Installing windows directly to the drive to see if i experience the same issue. If i do i would assume there just horrible drives or its a compatibility issue with the motherboard. Where i will try a different computer. anyway i will let you know the outcome. Quote Link to comment
ulisses1478 Posted May 25, 2019 Author Share Posted May 25, 2019 I have no problem with any os on the SSD im using it's just on virtual machine Quote Link to comment
cheww Posted May 26, 2019 Share Posted May 26, 2019 18 hours ago, ulisses1478 said: I have no problem with any os on the SSD im using it's just on virtual machine Ok, well i am happy to say i have sorted my issue out. Just in case anyone ever has this issue something for them to try. I download Crucial SSD software originally to check and see if there was a new firmware (which there wasn't) so i saw it had a sanitize option (which wipes the drive completely) i don't know what made me want to do it, but i did it and its working 100% .. Sits on 98-113 MB/s Quote Link to comment
ulisses1478 Posted May 29, 2019 Author Share Posted May 29, 2019 I will try it, the sanitize opetion it was on the Crucial SSD software? Quote Link to comment
ulisses1478 Posted June 1, 2019 Author Share Posted June 1, 2019 Probably the problem was the NTFS partition. I pre clear the disk and put XFS on it running test fine now. Quote Link to comment
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