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Default Stripe Size

Stripe Size: 1

Number of Flash OSTs in Taiga: 24

Number of HDD OSTs in Taiga: 1628

Lustre is capable of striping data over multiple OSTs to increase performance and help balance data across the disks.  The default stripe for Taiga is set to 1 but this value is overridden as the file being written gets larger and larger; this behavior is determined by the PFL configured for Taiga which is described in the next section.  If a user wants to see how many OSTs a file is striped across they can run the below command; the example shows a file that is striped across 2 OSTs.  

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Second, it allows us to dynamically set the stripe size of files so that the bigger a file grows the more stripes it gets.  This helps improve the performance of the system, and helps keep the OST usage rates more balanced which leads to overall better system responsiveness.  The stripe count of a file can be overridden by using either "lfs setstripe" or by using "lfs migrate" to change an existing file's stripe count; however these actions are very much discouraged.  Users should use the system defaults except in rare cases.  

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Stripe for Files 4GB and Above: All HDD (Currently 1628)

Taiga Access Methods

Lustre Native Mount

Taiga is available via a native Lustre mount on the below systems: 

• Delta
• HAL
• Radiant
• HOLL-I
• NCSA Industry Systems

Native sub-directory mounts can also be requested for one-off machines via an SVC ticket, with the STO: Taiga component.  SET will be providing a streamlined guide for Lustre client installation and configuration here (link coming soon).  Requests for one-off mounts of Taiga will only be allowed for machines that have gone through the NCSA security hardening process.  

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