On 2018-10-05 20:34, Duncan wrote:
Wilson, Ellis posted on Fri, 05 Oct 2018 15:29:52 + as excerpted:
Is there any tuning in BTRFS that limits the number of outstanding reads
at a time to a small single-digit number, or something else that could
be behind small queue depths? I can't
Wilson, Ellis posted on Fri, 05 Oct 2018 15:29:52 + as excerpted:
> Is there any tuning in BTRFS that limits the number of outstanding reads
> at a time to a small single-digit number, or something else that could
> be behind small queue depths? I can't otherwise imagine what the
>
On 10/05/2018 06:40 AM, Duncan wrote:
> Wilson, Ellis posted on Thu, 04 Oct 2018 21:33:29 + as excerpted:
>
>> Hi all,
>>
>> I'm attempting to understand a roughly 30% degradation in BTRFS RAID0
>> for large read I/Os across six disks compared with ext4 atop mdad
Wilson, Ellis posted on Thu, 04 Oct 2018 21:33:29 + as excerpted:
> Hi all,
>
> I'm attempting to understand a roughly 30% degradation in BTRFS RAID0
> for large read I/Os across six disks compared with ext4 atop mdadm
> RAID0.
>
> Specifically, I achieve performa
On 5.10.2018 00:33, Wilson, Ellis wrote:
> Hi all,
>
> I'm attempting to understand a roughly 30% degradation in BTRFS RAID0
> for large read I/Os across six disks compared with ext4 atop mdadm RAID0.
>
> Specifically, I achieve performance parity with BTRFS in terms of
Hi all,
I'm attempting to understand a roughly 30% degradation in BTRFS RAID0
for large read I/Os across six disks compared with ext4 atop mdadm RAID0.
Specifically, I achieve performance parity with BTRFS in terms of
single-threaded write and read, and multi-threaded write, but poor
when I use two disk to create raid0 in btrfs, after rebooting
system,one disk unable to mount ,
error is as follows:
mount: wrong fs type, bad option, bad superblock on /dev/md0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
How can I verify the read speed of a btrfs raid0 pair in archlinux.?
I assume raid0 means striped activity in a paralleled mode at lease
similar to raid0 in mdadm.
How can I measure the btrfs read speed since it is copy-on-write which
is not the norm in mdadm raid0.?
Perhaps I cannot use
On Fri, Oct 04, 2013 at 04:15:22PM +, ray clancy wrote:
How can I verify the read speed of a btrfs raid0 pair in archlinux.?
I assume raid0 means striped activity in a paralleled mode at lease
similar to raid0 in mdadm.
How can I measure the btrfs read speed since it is copy-on-write
Hi,
So the case is, now I've got a btrfs image file, which is created from a
raid0 btrfs fs.
And if I run 'btrfs-image -r image_file /dev/sdf', then I have to mount
it with 'degraded' mode, and that still fails because raid0 requires two
disks at least.
So any ideas how to make it work?
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