dvd.collector Posted November 8, 2018 Share Posted November 8, 2018 I want to use two ssd's in a raid 0 configuration as a cache drive. I created a RAID0 array in the bios of my unraid server, however unraid does not seem to see that - it still sees the individual disks. Is this expected? Quote Link to comment
JorgeB Posted November 8, 2018 Share Posted November 8, 2018 5 minutes ago, dvd.collector said: it still sees the individual disks. Is this expected? Yes, Unraid doesn't support most RAID controllers, and definitely not "fake" RAID like Intel RST or similar, you can use a btrfs pool and change the profile to raid0: https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=480421 Quote Link to comment
dvd.collector Posted November 8, 2018 Author Share Posted November 8, 2018 Thanks for the quick reply. I don't suppose I have much choice, but is a btrfs raid 0 pool as fast as I would expect (e.g nearly double the speed of a single ssd)? Lee. Quote Link to comment
dvd.collector Posted November 8, 2018 Author Share Posted November 8, 2018 OK, I removed the raid 0 from the bios and added both ssd's as cache drives. Now I see the attached error message. Clicking format does nothing. Quote Link to comment
JorgeB Posted November 8, 2018 Share Posted November 8, 2018 Yes, performs similar to other software/fakeraid raid implementations. Quote Link to comment
JorgeB Posted November 8, 2018 Share Posted November 8, 2018 clear both devices with: blkdiscard /dev/sdX Quote Link to comment
dvd.collector Posted November 8, 2018 Author Share Posted November 8, 2018 OK, so I stopped the array, ran the blkdiscard command on both disks, restarted array but see the same error message. Should I have removed them as cache drives first? I'll try that now anyway. Quote Link to comment
JorgeB Posted November 8, 2018 Share Posted November 8, 2018 You'll still need to format them, if format fails after wiping post the diagnostics. Quote Link to comment
dvd.collector Posted November 8, 2018 Author Share Posted November 8, 2018 (edited) Attached Diagnostics. tower-diagnostics-20181108-1929.zip Can see this in the logs, is it trying to format one drive as XFS? Nov 8 19:26:34 Tower emhttpd: shcmd (1000): /sbin/wipefs -a /dev/sde1 Nov 8 19:26:34 Tower emhttpd: shcmd (1001): mkfs.xfs -m crc=1,finobt=1 -f /dev/sde1 Edited November 8, 2018 by dvd.collector Quote Link to comment
JorgeB Posted November 8, 2018 Share Posted November 8, 2018 4 minutes ago, dvd.collector said: is it trying to format one drive as XFS? Yep, don't know why, never seen this before but it looks like a bug. With the array stopped click on cache and change filesytem to btrfs. 1 Quote Link to comment
dvd.collector Posted November 8, 2018 Author Share Posted November 8, 2018 (edited) OK so when I click on Cache, I can change that to btrfs. When I click on cache2, it says "unknown" in partition format. Went ahead and changed Cache to btrfs anyway then clicked format. It looks like this worked (see screenshot). Now just need to change to raid 0 i guess. Edited November 8, 2018 by dvd.collector Quote Link to comment
dvd.collector Posted November 8, 2018 Author Share Posted November 8, 2018 Conversion to raid0 appears to have worked: Many thanks for your help! Quote Link to comment
RealIPSec Posted October 23, 2020 Share Posted October 23, 2020 Hello How did you change it to raid0 please ? Quote Link to comment
JorgeB Posted October 23, 2020 Share Posted October 23, 2020 6 minutes ago, RealIPSec said: How did you change it to raid0 please ? https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=480421 Quote Link to comment
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