Adding Volumes to XtremIO Consistency Groups

XtremIO 4.0 added the concepts of Consistency Groups and Snapshot Sets. These were added mainly to simplify the flow when creating new snapshots of multiple volumes, and more importantly when refreshing/restoring those snapshots. Volumes are added to a Consistency Group, a snapshot of that CG is taken (and…

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Dynamic Currency Conversion

If you've ever traveled internationally and used a credit card, odds are at some point you've been asked if you'd rather pay in the local currency, or in your home currency. Being charged in your home currency - or "Dynamic Currency Conversion" (DDC) as it's called - sounds like a…

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Friends Don't Let Friends Run Oracle on ZFS

I frequently get asked why I recommend against running Oracle DBMS on ZFS, and instead recommend using ASM. The filesystem v's ASM (or filesystem v's raw device) is a decision that people have had to make with databases for dozens of years. Over that time, in general, filesystem performance has…

#Tags: zfs, solaris, alignment, performance testing, xtremio, oracle

Flash testing tools - CrystalDiskMark

CrystalDiskMark is the type of tool I wouldn't even normally look at due to it's focus market, but one of our SE's asked about it last week, so... CrystalDiskMark is a tool you would normally see used on standalone hard disks/SSD, in particular on consumer focused websites like Toms…

#Tags: performance testing, xtremio, diskspd

Flash testing tools - Diskspd

Some time ago I wrote about Microsoft's storage performance testing tool SQLIO, with the conclusion that it was unsuitable for using with flash-based products as it wrote nothing but zeros, which will not be stored by flash but instead treated as if they were an UNMAP/TRIM request. It seems…

#Tags: performance testing, xtremio

ZFS and Intelligent Storage

It's been almost 10 years to the day since Sun Microsystems first released ZFS as a part of the Solaris 10 6/06 release. I worked for Sun at the time, and it was clear that ZFS was a revolution in file systems - but it was also very clear…

#Tags: solaris, zfs, xtremio