I’ve been doing some testing that requires rather large file systems. I have an EMC XtremIO Dual X-Brick array from which I provision a 10 terabyte volume. Volumes in XtremIO are always thinly provisioned. The testing I’m doing required me to scrutinize default Linux mkfs(8) behavior for both Ext4 and XFS. This is part 1 in a short series and it is about Ext4.
Discard the Discard Option
The first thing I noticed in this (more...)
I’ve started updating the SLOB Resources page with links to “recipes” for certain SLOB testing. The first installment is the recipe for loading 8TB scale SLOB 2.3 Multiple Schema Model with a 2-Socket Linux host attached to EMC XtremIO. Recipes will include (at a minimum) the relevant SLOB program output (e.g., setup.sh or runit.sh), init.ora and slob.conf.
Please keep an eye on the SLOB Resources page for updates…and (more...)
This is just a quick blog post to direct readers to a YouTube video I recently created to help explain to someone how flexible EMC XtremIO Snapshots are. The power of this array capability is probably most appreciated in the realm of provisioning storage for Test and Development environments.
Although this is a silent motion picture I think it will speak volumes–or at least 1,000 words.
Please note: This is just a video demonstration to (more...)
This is just a quick post to announce SLOB 2.3. Please visit the SLOB Resources page to download the gzipped tar archive. The SLOB Resources page also has a link the SLOB 2.3 Documentation.
SLOB Resources Page: Click Here.
New in this release:
- The documentation is now also included in the tar archive under SLOB/doc in PDF form.
- SLOB 2.3 introduces the SLOB Single Schema feature. Please see the documentation.
- Because of (more...)
SLOB 2.3 is releasing within the next 48 hours. In case anyone wants to read about all the new features here is a link to the SLOB 2.3 User Guide:
SLOB 2.3 User Guide (pdf)
Filed under: oracle
SLOB 2.3 is soon to be released. This version has a lot of new, important features but also a significant amount of tuning in the data loading kit. Before sharing where the progress is on the front, I’ll quickly list some of the new important features that will be in SLOB 2.3:
- Single Schema Support. SLOB historically avoids application-level contention by having database sessions perform the SLOB workload against a private schema. The (more...)
If you are interested in array-level data reduction services and how such technology mixes with Oracle Database application-level compression (such as Advanced Compression Option), I offer the link below to an EMC Lab Report on this very topic.
To read the entire Lab Report please click the following link: Click Here.
The following is an excerpt from the Lab Report:
EMC XtremIO storage array offers powerful data reduction features. In addition to (more...)
This is a just a quick blog post to direct readers to the best Oracle-related paper detailing the value EMC XtremIO brings to Oracle Database use cases. I’ve been looking forward to the availability of this paper for quite some time as I supported (minimally, really) the EMC Global Solutions Engineering group in this effort. They really did a great job with this testing! I highly recommend this paper for readers who are interested in:
When Something Is Simple It Must Be Simple To Prove
Provisioning high-performance storage has always been a chore. Care and concern over spindle count, RAID type, RAID attributes, number of controller arms involved and a long list of other complexities have burdened storage administrators. Some of these troubles were mitigated by the advent of Automatic Storage Management–but not entirely.
Wouldn’t it be nice if the complexity of storage provisioning could be boiled down to but (more...)
It’s been a long time since my last installment in the Little Things Doth Crabby Make series and to be completely honest this particular topic isn’t really all that fit for a LTDCM installment because it covers something that is possible but less than expedient. That said, there are new readers of this blog and maybe it’s time they google “Little Things Doth Crabby Make” to see where this series has been. This post might rustle (more...)
I want to make these two points right out of the gate:
- I do not question Oracle’s IOPS claims in Exadata datasheets
- Everyone makes mistakes
Everyone Makes Mistakes
Like me. On January 21, 2015, Oracle announced the X5 generation of Exadata. I spent some time studying the datasheets from this product family and also compared the information to prior generations of Exadata namely the X3 and X4. Yesterday I graphed some of the datasheet numbers (more...)
This is a short post to recommend some recent blog posts by Nikolay Manchev and Bertrand Drouvot on the topic of Oracle Database 12c NUMA awareness.
Nikolay provides a very helpful overview on Linux Control Groups and how they are leveraged by Oracle Database 12c. Bertrand Drouvot carried the topic a bit further by leveraging SLOB to assess the impact of NUMA remote memory on a cached Oracle Database workload. Yes, SLOB is very useful (more...)
I’ve gotten a lot of reports of folks branching out into SLOB 2.2 large user count testing with the SLOB 2.2 Think Time feature. I’m also getting reports that some of the same folks are not getting the resultant AWR reports one expects from a SLOB test.
If you are not getting your AWR reports there is the old issue I blogged about here (click here). That old issue was related to a (more...)
BLOG UPDATE 2015.07.24: For all testing recipes please visit the SLOB Recipes section of kevinclosson.net/slob
This is Part II in a series. Part I can be found here (click here). Part I in the series covered a very simple case of SLOB data loading. This installment is aimed at how one can use SLOB as a platform test for a unique blend of concurrent, high-bandwidth data loading, index creation and CBO statistics (more...)
This is a quick blog post to show SLOB users how to determine whether they are using the latest SLOB kit. If you visit kevinclosson.net/slob you’ll see the webpage I captured in the following screenshot.
Once on the SLOB Resources page you can simply hover over the “SLOB 2.2 (Click here)” hyperlink and the bottom of your browser will show the full name of the tar archive. Alternatively you can use md5sum(1) on (more...)
I invite you to please read this report.
NAND Flash is good for a lot of things but not naturally good with write-intensive workloads. Unless, that is, skillful engineering is involved to mitigate the intrinsic weaknesses of NAND Flash in this regard. I assert EMC XtremIO architecture fills this bill.
Regardless of your current or future plans for adopting non-mechanical storage I hope this lab report will show some science behind how to determine suitability (more...)
This is a hasty blog post to get SLOB 2.2 out to those who are interested.
Where To Get The Kit
Please visit kevinclosson.net/slob
About The New Kit
In addition to doing away with the cumbersome “seed” table and procedure.sql, this kit introduces 5 new slob.conf parameters. By default these parameters are disabled.
This SLOB distribution does not require re-executing setup.sh. One can simply adopt the kit and use (more...)
I’m surprised to find that Google is not cleanly ranking the helpful set of blog posts by Oracle’s Maria Colgan on the Oracle Database 12c In-Memory Column Store feature so I thought I’d put together this convenient set of links. Google search seems to only return a few of them in random order.
Over time I may add other helpful links regarding Oracle’s new, exciting caching technology.
Getting Started With Oracle Database In-Memory. (more...)
BLOG UPDATE 2015.01.20: Please Note! This patch has been deprecated. Please go to kevinclosson.net/slob to get the latest SLOB kit with the latest awr_info.sh.
BLOG UPDATE 2014.09.11: Please note: the following is a link to a more recent update of the awr_info.sh script. This version adds DB Time, DB CPU and Logical I/O: click here. The MD5 sum for this version of awr_info.sh is: a28a38b11040bb94f08a8f817792c75c
The SLOB (more...)
This is a quick blog post to help folks that are testing with SLOB at high user (session) counts. The situation may arise where you are testing SLOB on a large configuration, with or without SQL*Net, and the SLOB driver (runit.sh) is failing to produce Automatic Workload Repository (a.k.a AWR) reports.
This problem will generally be seen on RHEL 6 variants that implement the much maligned /etc/security/limits.d/90-nproc.conf method of preventing (more...)