And if anyone is wondering why this is not the default, the answer is
here: https://github.com/zfsonlinux/zfs/issues/443
** Bug watch added: Github Issue Tracker for ZFS #443
https://github.com/zfsonlinux/zfs/issues/443
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Ah, that is a good solution. By default, ZFS on Linux will store xattrs
in a hidden folder, so there are multiple seeks per xattr and it's
poorly cached, so it will impact on performance especially on the slower
block devices. The zfs set xattr=sa will store this in the inodes and
will really hel
Hello Colin,
I set a couple of ZFS options a day or two ago, and have bee playing videos
to see if we still have the problem. The options I set were:
o zfs set xattr=sa storage
o zfs set xattr=sa storage/vault
o zfs set ralatime=on storage
o zfs set ralatime=on storage/vault
We've pl
I've tried to simulate this with very slow media and can't yet reproduce
this issue. Can you play the DVD image and also run the following
command in another terminal:
iostat 1 300 > iostat.log
this will capture 5 minutes of activity. please then attach the log to
the bug report.
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root@hetty:/home/crlb# blockdev --getpbsz /dev/sdb
512
root@hetty:/home/crlb# blockdev --getpbsz /dev/sdc
512
root@hetty:/home/crlb#
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https://bugs.launchpad.net/bugs/1725859
Title:
zfs
Just one more check, what is the block size of the raw devices? One can
check this using:
sudo blockdev --getpbsz /dev/sdb
sudo blockdev --getpbsz /dev/sdc
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Hello Colin, I have a couple more screen shots showing the raw
performance of both drives; the first using 512MiB as you suggested and
the second with a larger sample and using the dd commands
status=progress option to monitor for pauses. Also in the second ss, I
performed the test on an iso file f
** Attachment added: "raw device and zfs performance on a larger sample."
https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1725859/+attachment/5114648/+files/dd-2.png
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https://
The iostat -mx shows that the /dev/sdb /dev/sdc devices have a very high
read I/O latency of ~80-110 milliseconds which may be the underlying
issue.
I suggest seeing how long it takes to read data from these raw devices
to sanity check their maximum speed. One can do this by doing:
sync
echo 3 |
Hello Colin,
Thank you for responding. To Answer your questions:
1. I have two external drives, sdb and sdc, in USB 3 Orico enclosure. The
drives are mirrored.
2. Atom D525 with 4GiB RAM. The attached screenshot shows "vmstat 5 5" output
while VLC is playing a movie. It shows 1.5GiB of fre
1. what is your ZFS configuration (number of drives?)
2. size of your system (total memory, free memory).
3. Do your drive(s) suffer from large I/O latencies?
- what is the output from iostat -mx
You may possibly get some benefit from setting spl_kmem_cache_slab_limit
to zero as a module parame
Just updated to:
root@hetty:~# apt list --installed | awk '/zpool|zfs/'
libzfs2linux/artful-updates,now 0.6.5.11-1ubuntu3.2 amd64 [installed,automatic]
libzpool2linux/artful-updates,now 0.6.5.11-1ubuntu3.2 amd64 [installed]
zfs-zed/artful-updates,now 0.6.5.11-1ubuntu3.2 amd64 [installed,automatic]
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