Re: defragmenting best practice?

2017-09-15 Thread Michał Sokołowski
On 09/15/2017 03:07 PM, Tomasz Kłoczko wrote: > [...] > Case #1 > 2x 7200 rpm HDD -> md raid 1 -> host BTRFS rootfs -> qemu cow2 storage > -> guest BTRFS filesystem > SQL table row insertions per second: 1-2 > > Case #2 > 2x 7200 rpm HDD -> md raid 1 -> host BTRFS rootfs -> qemu raw storage -> >

Re: defragmenting best practice?

2017-09-15 Thread Michał Sokołowski
On 09/14/2017 07:48 PM, Tomasz Kłoczko wrote: > On 14 September 2017 at 16:24, Kai Krakow wrote: > [..] >> > Getting e.g. boot files into read order or at least nearby improves >> > boot time a lot. Similar for loading applications. > [...] > Just please some example which I

Re: number of subvolumes

2017-08-31 Thread Michał Sokołowski
On 08/31/2017 01:18 PM, Austin S. Hemmelgarn wrote: > [...] >> Any hint here? > Having compression enabled causes no issues with defray and balance. > There appears to be a prevalent belief however that defrag is > pointless if you're using compression, probably because some versions > of

Re: Exactly what is wrong with RAID5/6

2017-06-23 Thread Michał Sokołowski
Hello group. I am confused: Can somebody please confirm/deny, which RAID subsystem is affected? BTRFS' RAID5/6 or mdadm (Linux kernel raid) RAID 5/6 ? Are there some gotchas (in terms of broken reliability) when using kernel one? The web is full of legends, it seems that this confusion is quite