hi,
after getting a USB enclosure that allowes me to access each of its
disks as individual devices, i played around with btrfs a weekend, and
here are some questions i hit, but could not find an answer for.
Setup: 4 disks, 2x 500gig, 2x1500gig, connected to a SATA port
multiplier backplane to a SATA<->USB converter. PC is a i686 Celeron M,
running 3.4.0-rc1, running the latest btrfs tools from git.
*) at first, i created the volume as raid10. i started filling it up,
and when the 2 500gig disks where full, i got ENOSPC errors. which makes
me wonder: what is the advantage of raid10 over raid1?
*) i added a 16gig SD card to the array
*) with `btrfs balance start -dprofile=raid1 /vol` (the syntax of the -d
parameter is not clear in the help --full or man page). this operation
completed quite quickly.
*) i continued to fill it, and i could put another 100gig orso on the
volume before i hit ENOSPC again. but this time, there is plenty of
space on the 2 1500gig disks that should be usable right?
*) i deleted the 16gig SD card from the array. when i watched this
process with dstat, i noticed that its doing lots of writes to the
device beeing deleted. why is this? after a while, it failed claiming
there was not enough free space.
*) i started a rebalance, when i watched this with `btrfs balance status
/vol` i showed that is planned to process 549 chunks, when i paused and
resumed it, (the pause takes quite a while), it only planned to do 80
chuncks.
If i should do more specific tests or provide specific details, please
let me know. i have little experience in 'official' testing these kind
of things.
Remco
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