Thanks for your reply, Janne!
I was estimating the theoretical maximum recover speed for erasure
coded pool. My calculation may not be accurate, hope it can be close
to the correct one and the list can help here.
As for hardware/software RAID, user can set the speed for rebuilding.
Some hardware
Den tors 9 maj 2019 kl 17:46 skrev Feng Zhang :
> Thanks, guys.
>
> I forgot the IOPS. So since I have 100disks, the total
> IOPS=100X100=10K. For the 4+2 erasure, one disk fail, then it needs to
> read 5 and write 1 objects.Then the whole 100 disks can do 10K/6 ~ 2K
> rebuilding actions per secon
Thanks, guys.
I forgot the IOPS. So since I have 100disks, the total
IOPS=100X100=10K. For the 4+2 erasure, one disk fail, then it needs to
read 5 and write 1 objects.Then the whole 100 disks can do 10K/6 ~ 2K
rebuilding actions per seconds.
While for the 100X6TB disks, suppose the object size is
Den tors 9 maj 2019 kl 16:17 skrev Marc Roos :
>
> > Fancy fast WAL/DB/Journals probably help a lot here, since they do
> affect the "iops"
> > you experience from your spin-drive OSDs.
>
> What difference can be expected if you have a 100 iops hdd and you start
> using
> wal/db/journals on ssd?
to
(estimating)?
-Original Message-
From: Janne Johansson [mailto:icepic...@gmail.com]
Sent: donderdag 9 mei 2019 16:13
To: Feng Zhang
Cc: ceph-users
Subject: Re: [ceph-users] maximum rebuild speed for erasure coding pool
Den tors 9 maj 2019 kl 15:46 skrev Feng Zhang :
For erasure
Den tors 9 maj 2019 kl 15:46 skrev Feng Zhang :
>
> For erasure pool, suppose I have 10 nodes, each has 10 6TB drives, so
> in total 100 drives. I make a 4+2 erasure pool, failure domain is
> host/node. Then if one drive failed, (assume the 6TB is fully used),
> what the maximum speed the recoveri
Hello all,
I have a naive question about the way and the maximum rebuild speed
for erasure coding pool. I did some search, but could not find any
formal and detailed information about this.
For pool recovering, the way Ceph works(to my understanding) is: each
active OSD scrubs the drive, and if i
