Tim,
I'm apologising for not being precise enough.
The main requirements are related to agility:
1. Fast fallback and rollback in the case of upgrades and tests.
2. Fast provisioning of test and development databases based on a source
database.
Both requirements have been achieved by the means of ZFS snapshot, rollback and
clone commands.
Furthermore, ZFS has significantly simplified capacity management. What I mean
by that is Unix admins provision the space in the pools (zpools), and the space
is being allocated to individual ZFSs as the databases are growing. This makes
the DBA life easier if there are 20-30 databases in a Solaris container, as it
is much cheaper to always keep some spare capacity in the pool to account for
an unexpected growth than to micromanage individual databases.
On the other hand, the main disadvantage has been so far that sometimes the
quality of new releases left something to be desired for. As a consequence,
we've been occasionally spending more time for troubleshooting and performance
tuning than we had budgeted for. These are the examples of the problems we've
been encountering over the past years:
http://nenadnoveljic.com/blog/arc-resizing-user_reserve_hint_pct/
http://nenadnoveljic.com/blog/solaris-11-3-hang-kernel-object-manager/
I've been using ZFS since it was released in Solaris 10. In my opinion, its
benefits far outweigh its disadvantages. The reason I'm thinking about
alternatives are the recent layouts of Solaris engineers by the Oracle
Corporation.
Finally, let me mention that I'm willing to accept some penalty in performance
which is inherent to copy-on-write file systems (see Bart Sjerps' blog post
https://bartsjerps.wordpress.com/2013/02/26/zfs-ora-database-fragmentation/ ;)
in exchange for the features which would help fulfilling the aforementioned
agility requirements.
Thanks,
Nenad
Gesendet über BlackBerry Work
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Von: Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxx>>
Datum Montag, 04. Sep. 2017, 12:14 AM
An: gogala.mladen@xxxxxxxxx
<gogala.mladen@xxxxxxxxx<mailto:gogala.mladen@xxxxxxxxx>>,
oracle-l@xxxxxxxxxxxxx <oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>>
Betreff: AW: Copy-on-write file systems
Hi Mladen,
Thank you for your feedback!
ACFS seems to be a viable alternative to ZFS then.
I'm surprised to hear about good benchmark results of ZFS on Linux. I thought
that ZFS has not been integrated into the Linux Kernel, i.e. that the ZFS
processes are running in the user space.
As already mentioned, I've been successfully using ZFS from its very beginning,
but I've got the impression that its future is uncertain.
Thank you,
Nenad
Gesendet über BlackBerry Work
(www.blackberry.com)
Von: Mladen Gogala <gogala.mladen@xxxxxxxxx<mailto:gogala.mladen@xxxxxxxxx>>
Datum Sonntag, 03. Sep. 2017, 11:54 PM
An: oracle-l@xxxxxxxxxxxxx
<oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>>
Betreff: Re: Copy-on-write file systems
Not being able to afford a T5 super-cluster, I am playing with ZFS on Linux. It
is surprisingly good, no complaints at all. Here are two pages about ZFS
beating Ext4 on benchmark:
http://www.phoronix.com/scan.php?page=article&item=ubuntu-xenial-zfs&num=1
https://www.phoronix.com/forums/forum/software/general-linux-open-source/35594-zfs-vs-ext4-zfs-wins
ZFS is a very decent file system.
On 09/03/2017 02:47 PM, Tim Gorman wrote:
Nenad,
It is helpful to share those requirements, as it is not useful to make
recommendations without them?
What is it that you're trying to accomplish? What did ZFS do right, and at
what did it fail?
Thanks!
-Tim
On 9/3/17 04:16, Noveljic Nenad wrote:
Hi,
Is anybody running databases on ACFS or some other copy-on-write file system?
I'd be greatful if you could share your experiences.
I'm looking for alternatives to ZFS, which has had fulfilled most of our
requirements so far.
Many thanks in advance,
Nenad
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(www.blackberry.com<http://www.blackberry.com>)
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