November 30, 20187 yr im having some problems with a btrfs cache of 4 ssd samsung 840 evo in unraid the performance is really really poor https://gyazo.com/936a484279c5c211c8ec96a2d9ed14c4 i read that could be the align of the partition but i dont know how to change it in unraid, i changed the align with fdisk but unraid change it back when i mounted the array...
November 30, 20187 yr Community Expert 5 hours ago, elfco said: but i dont know how to change it in unraid You can't for now, the Samsung alignment issue has bee reported before and LT is already aware, don't know if a fix is planned soon though, still that's very poor performance even for non optimally aligned SSDs, are they being trimmed and what raid profile are you using?
November 30, 20187 yr Community Expert 29 minutes ago, elfco said: they are in btrfs, I meant what kind of raid, 1, 0, 10, I assume you're using the default raid1 29 minutes ago, elfco said: formated today and empthy so they are trimmed If they where used before in another system you still need to trimmed them, unless they've been secure erased or similar, if they are trimmed there's likely something wrong with one or more of the SSDs, by coincident I have a couple of 840 EVOs on my test server, this is me writing to that pool using default raid1 on my test server:
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