<div dir="ltr"><div><div><div><div>The only similar issue I've had, with slow ZFS, was due to issues with a 3Ware RAID controller and disks in JBOD mode under fbsd 9 and 10. It was even pretty useable when talking to external disks on i386 (non-64 bit) in a pinch.<br><br></div>Do you have the same problem with UFS under fbsd 11?<br><br></div>FYI, you're probably going to want more RAM than 4GB to get decent performance out of ZFS. I understand this is more of an experiment than a production system or something :)<br><br></div>Thanks,<br></div>Jonathan<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Nov 2, 2016 at 12:00 PM, <span dir="ltr"><<a href="mailto:cdbug-talk-request@lists.nycbug.org" target="_blank">cdbug-talk-request@lists.nycbug.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send CDBUG-talk mailing list submissions to<br>
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Today's Topics:<br>
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1. Slow ZFS and/or Backup/recovery question (Steve Moon)<br>
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Message: 1<br>
Date: Tue, 1 Nov 2016 23:41:28 -0400<br>
From: Steve Moon <<a href="mailto:steve.moon@gmail.com">steve.moon@gmail.com</a>><br>
To: CDBUG <<a href="mailto:cdbug-talk@lists.nycbug.org">cdbug-talk@lists.nycbug.org</a>><br>
Subject: [CDBUG-talk] Slow ZFS and/or Backup/recovery question<br>
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<CAK4=V7=<a href="mailto:dbhZNrq8gsToi0fWB0qgduPizqi3ZzV7GCH5RWC9KYg@mail.gmail.com">dbhZNrq8gsToi0fWB0qgd<wbr>uPizqi3ZzV7GCH5RWC9KYg@mail.<wbr>gmail.com</a>><br>
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<br>
I recently resurrected an old laptop and loaded FreeBSD 11 and ended up<br>
really liking it.<br>
<br>
So far so good.<br>
<br>
The laptop started with a dead hard drive that I swapped out with a<br>
different drive. While the original drive worked fine with the "AHCI" BIOS<br>
setting, the new drive The laptop freezes at the BIOS screen unless AHCI is<br>
changed to compatible (IDE) mode.<br>
<br>
The drive seemed to work fine when I fired it up, I got Ubuntu installed<br>
with no issues, started over with FreeBSD, re-installed clean a couple of<br>
times, finally just went with a ZFS root and everything seemed okay. I got<br>
X configured, but noticed it got _really_ slow.<br>
<br>
diskinfo -t /dev/ada0 shows some stunningly poor disk performance - like<br>
1MB/s reads.<br>
<br>
I've done a lot of research on ZFS and tweaked some settings in loader.conf<br>
but to no avail - the disk is slow.<br>
<br>
So I've either got a slow disk, perhaps because it is in the process of<br>
dying, or there is some kind of incompatibility with ZFS and the IDE mode<br>
(some googling showed a few places where AHCI is suggested over ZFS).<br>
<br>
I have no real use for ZFS other than the novelty value. It's not like a<br>
300GB SATA disk on an old consumer-grade Lenovo Z560 laptop with 4GB RAM is<br>
going to exercise ZFS.<br>
<br>
However I did do a lot of tweaking, installing packages and ports, etc. etc.<br>
<br>
So to the questions:<br>
1. Has anyone had similar issues with ZFS - could it just be that?<br>
2. Either way - ZFS or hardware - any suggestions on how I could back up<br>
the various configurations and package/port installs and then re-install<br>
them on top of a fresh install on a new disk? Linux Mint had a "upgrade"<br>
option that basically dumped a list of installed packages and after a fresh<br>
install of the new version of Mint you'd "apply" that to get your stuff<br>
re-installed. It looks like that may have changed, but it was slick the<br>
time or two I used it.<br>
<br>
I see I could run something like: pkg query --all '%o %n-%v %R'<br>
- then manually get that stuff re-installed after a clean install.<br>
<br>
Anyone have any other ideas? The disk is so slow it might take 24+ hours to<br>
use dump, tar, or the like, and I'd like to ditch ZFS anyway.<br>
<br>
Thanks-<br>
Steve-<br>
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