April 20, 20179 yr MKNSSDRE1TB_MK160830100222344 - 1 TB (sdl) btrfs 624GB (size) 246GB (used) 378 GB (free) Samsung_SSD_840_Series_S19HNSAD628289A - 120 GB (sdk) OCZ-VECTOR_OCZ-KP7XM481IQSXC36Q - 128 GB (sdi) I'm not understanding how a raid1 btrfs cache of a 1TB, 120GB, and a 128GB SSD would only total 624GB? Am I missing something here or is this just plain wrong? All these ssds were clean and formatted by unraid. Thanks, Frosty
April 20, 20179 yr Worth pointing out that with the mix of drives reported and the default of BTRFS RAID-1 the usable space will be the sum of the two SSD drives so much less that the 624G being reported.
April 20, 20179 yr 7 hours ago, Darksurf said: I'm not understanding how a raid1 btrfs cache of a 1TB, 120GB, and a 128GB SSD would only total 624GB? RAID1 means all data will have a copy on another physical disk, so the maximum possible total size with those 3 SSD's would be 248GB. Otherwise there would be data that couldn't have a duplicate on the set. 6 hours ago, johnnie.black said: Know btrfs issue, size is incorrectly reported when using different size devices. http://carfax.org.uk/btrfs-usage/ will give you the real usable capacity for a given set of disks and RAID level.
April 20, 20179 yr Author oops apolgies, 21 minutes ago, jonathanm said: RAID1 means all data will have a copy on another physical disk, so the maximum possible total size with those 3 SSD's would be 248GB. Otherwise there would be data that couldn't have a duplicate on the set. http://carfax.org.uk/btrfs-usage/ will give you the real usable capacity for a given set of disks and RAID level. OMG, I should have noticed that. I need to set to RAID0. I just plugged the 1TB drive and immediately was confused by the total. The plan was to RAID1 2x1TB but I didn't have the funds to purchase the second one yet so I was planning on changing the raid and leaving the small ones in. Appears I skipped a step and didn't pay attention. So lame and embarrassing., I just missed a lvl 0 problem and I've been doing this for years. Edited April 20, 20179 yr by Darksurf
April 20, 20179 yr 10 minutes ago, Darksurf said: OMG, I should have noticed that. I need to set to RAID0. I just plugged the 1TB drive and immediately was confused by the total. The plan was to RAID1 2x1TB but I didn't have the funds to purchase the second one yet so I was planning on changing the raid and leaving the small ones in. Appears I skipped a step and didn't pay attention. So lame and embarrassing., I just missed a lvl 0 problem and I've been doing this for years. If you actually use the calculator linked, you will find that you really want "single" instead of btrfs raid0:
April 20, 20179 yr Moving this entire thread to General Support since the "minor" detail of reported size is a known issue, the user didn't follow the rules for posting a defect report (pinned at the top of the Defect Report subforum), and he had other issues anyway.
April 20, 20179 yr Author 3 minutes ago, trurl said: If you actually use the calculator linked, you will find that you actually want "single" instead of btrfs raid0: You're right, I'll just remove the smaller 2 SSDs and leave the RAID1 settings in place for when I get the second 1T SSD. Thanks for the info. Sorry about the confusion. I should know not to jump to conclusions and post in forums after midnight.
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