Comments on: TIER has been renamed to BTIER

By: Milo

Milo — Thu, 28 Feb 2013 16:35:20 +0000

If I use an SSD in front of a SATA drive and the SSD fails, is the data that exists on the SATA drive still available? Or is everything basically lost at that point? I guess I’m wondering what type of file system exists on the SSD and the SATA drives and can the be read if they are detached from each other.

By: Corrado Fiore

Corrado Fiore — Sun, 10 Feb 2013 15:22:09 +0000

Hi Mark,

kudos for such an awesome package like Btier. We’re testing it on a HA setup (with DRBD) and so far it looks very promising. We could reach even better numbers than the ones you published.

As you write in Btier’s docs, “btier allows us to use either real blockdevices or files to be part of the tier.” Performance-wise, are there any differences between the two modes? Which one should be used in a production setup?

(Hope this is the right place to ask — feel free to redirect me to the SF mailing list if you prefer).

Best,
Corrado

By: David

David — Tue, 29 Jan 2013 03:32:47 +0000

Actually, I found this in a previous post…..is it still valid?

[global]
bs=4k
ioengine=libaio
iodepth=4
size=20g
direct=1
runtime=60
directory=/mnt/fio
filename=test.file
[seq-read]
rw=read
stonewall
[rand-read]
rw=randread
stonewall
[seq-write]
rw=write
stonewall
[rand-write]
rw=randwrite
stonewall

By: David

David — Tue, 29 Jan 2013 03:31:14 +0000

Hi Mark,
Thanks also for the benchmark comparisons. Is it possible for you to test the same setup with ZFSonLinux using SSD for ZIL and L@ARC?
I’m currently tossing up whether to use ZFSonLinuz or Btier at the moment.

Conversely, are you able to provide the ‘fio’ command you use for your tests or if its in another post, direct me to it and run the tests on my rig.

Thanks,
David

By: David

David — Mon, 28 Jan 2013 14:16:01 +0000

You are awesome! Thanks for a great product.