In fact my initial attempt I'm fairly certain with a combined MDT/MGS the command
tunefs.lustre --writeconf --fsname=name /dev/devis incorrect as it generated MGS errors, resubmitting the command
with --fsname=origname allowed the MDT to be mounted but now
MGS complains when the OST's try to mount that it doesn't know about
them. I assume the proper sequence (with everything unmounted) is
on the MDT/MGS and for each OST tunefs.lustre --writeconf --mgsnode=MGS_IP_ADDR@tcp0
--fsname="foobar" /dev/XXX but I'm leary of mucking things up further. BTW, this is my test lustre install not the production one so it's
not exactly the end of the world if it's destroyed though there is some
benchmark data on it I'd like to recover so I'd prefer not.James
After a variety of failed attempts I finally just reverted
everything. I'd still like to figure out the exact process
(or if it's trivially possible) for renaming a lustre instance. It doesn't appear to be as simple as this on the MDS
tunefs.lustre --writeconf --mgs --mdt --fsname="foobar" /dev/XXX and on the OSS
We have two distinct lustre installs with the name "lustre" and
I'd like to rename the test one to simplify parsing of
/proc/fs/lustre/llite/XXXX on the clients. Some docs for 1.4 to 1.6 migration reference a --reformat option
but that has ugly connotations and it's not documented in the actual
tunefs.lustre man page, which itself claims won't reformat or destroy
data. If there's no non-destructive way to do it that's fine. If there's
an incredibly simple way and I'm being an idiot my apologies (but
I'd still like to know).James Robnett
NRAO/NM
ps: As mentioned in the original post
-discuss/2011-February/015076.html
this is a simple 1.8.5 install with a combined MGS/MDT.
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Lustre varies over a wide continuum, and so there are no rigid boundaries between the different types of lustre. (For this reason, different sources can often describe the same mineral differently. This ambiguity is further complicated by lustre's ability to vary widely within a particular mineral species). The terms are frequently combined to describe intermediate types of lustre (for example, a "vitreous greasy" lustre).
Some minerals exhibit unusual optical phenomena, such as asterism (the display of a star-shaped luminous area) or chatoyancy (the display of luminous bands, which appear to move as the specimen is rotated). A list of such phenomena is given below.
Adamantine minerals possess a superlative[clarification needed] lustre, which is most notably seen in diamond.[1] Such minerals are transparent or translucent, and have a high refractive index (of 1.9 or more).[2] Minerals with a true adamantine lustre are uncommon, with examples including cerussite, zircon, and cubic zirconia.[2]
Dull (or earthy) minerals exhibit little to no lustre, due to coarse granulations which scatter light in all directions, approximating a Lambertian reflector. An example is kaolinite.[3] A distinction is sometimes drawn between dull minerals and earthy minerals,[4] with the latter being coarser, and having even less lustre.
Greasy minerals resemble fat or grease. A greasy lustre often occurs in minerals containing a great abundance of microscopic inclusions, with examples including opal and cordierite, jadeite.[2] Many minerals with a greasy lustre also feel greasy to the touch.[5]
Pearly minerals consist of thin transparent co-planar sheets. Light reflecting from these layers give them a lustre reminiscent of pearls.[9] Such minerals possess perfect cleavage, with examples including muscovite and stilbite.[2]
Silky minerals have a parallel arrangement of extremely fine fibres,[2] giving them a lustre reminiscent of silk. Examples include asbestos, ulexite and the satin spar variety of gypsum. A fibrous lustre is similar, but has a coarser texture.
Submetallic minerals have similar lustre to metal, but are duller and less reflective. A submetallic lustre often occurs in near-opaque minerals with very high refractive indices,[2] such as sphalerite, cinnabar, anthracite, and cuprite.
Vitreous minerals have the lustre of glass. (The term is derived from the Latin for glass, vitrum.) This type of lustre is one of the most commonly seen,[9] and occurs in transparent or translucent minerals with relatively low refractive indices.[2] Common examples include calcite, quartz, topaz, beryl, tourmaline and fluorite, among others.
Asterism is the display of a star-shaped luminous area. It is seen in some sapphires and rubies, where it is caused by impurities of rutile.[12][13] It can also occur in garnet, diopside and spinel.
Aventurescence (or aventurization) is a reflectance effect like that of glitter. It arises from minute, preferentially oriented mineral platelets within the material. These platelets are so numerous that they also influence the material's body colour. In aventurine quartz, chrome-bearing fuchsite makes for a green stone and various iron oxides make for a red stone.[12]
Chatoyant minerals display luminous bands, which appear to move as the specimen is rotated. Such minerals are composed of parallel fibers (or contain fibrous voids or inclusions), which reflect light into a direction perpendicular to their orientation, thus forming narrow bands of light. The most famous examples are tiger's eye and cymophane, but the effect may also occur in other minerals such as aquamarine, moonstone and tourmaline.
Colour change is most commonly found in alexandrite, a variety of chrysoberyl gemstones. Other gems also occur in colour-change varieties, including (but not limited to) sapphire, garnet, spinel. Alexandrite displays a colour change dependent upon light, along with strong pleochroism. The gem results from small-scale replacement of aluminium by chromium oxide, which is responsible for alexandrite's characteristic green to red colour change. Alexandrite from the Ural Mountains in Russia is green by daylight and red by incandescent light. Other varieties of alexandrite may be yellowish or pink in daylight and a columbine or raspberry red by incandescent light. The optimum or "ideal" colour change would be fine emerald green to fine purplish red, but this is rare.
Iridescence is the 'play' or 'fire' of rainbow-coloured light caused by very thin regular structures or layers beneath the surface of a gemstone. Similar to a thin film of oil on water, these layers interfere with the rays of reflected light, reinforcing some colours and cancelling others. Iridescence is seen at its best in precious opal.[14]
Schiller (German, literally "shimmer"), is the metallic iridescence originating from below the surface of a stone that occurs when light is reflected between layers of minerals. It is seen in moonstone and labradorite and is very similar to adularescence and aventurescence.[15]
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Lustre Blend can be used dry or wet! For a dry application, dip your food safe brush into the Lustre Jar and apply directly onto your bake. For a wet application, mix lustre with alcohol or activator on a paint palette, to create a pearly paint.
Data is core to high performance computing (HPC), especially for workloads such as those in life sciences, financial services, and media rendering. Accessing large amounts of data at extremely high speeds and low latencies is essential to HPC, but has always been a key challenge in running HPC workloads.
The HPC community has long met this need using storage technologies like the Lustre open-source parallel file system, which is commonly used in supercomputers today. The nearly unlimited scale of the cloud unlocks powerful capabilities for users, while also increasing the demand for fast parallel storage. Unfortunately, the configuration of the Lustre parallel file system is typically a technically challenging and time-consuming task, and can require an expert to implement correctly.
Once the Lustre deployment manager scripts are downloaded, review the lustre-template.yaml, which has descriptions of each field and example valid input, as well as the description of the YAML fields in the Configuration section of README.md, to understand what each field configures. Then open the lustre.yaml file with your favorite editor (vi, nano, etc.) and edit the configuration fields to satisfy your requirements. At a minimum, ensure that the following fields are complete and valid in your environment:
Note: The rest of this blog post assumes you use the default values populated in the lustre.yaml file for the fields cluster_name and fs_name. If you change these values, make sure to continue your changes throughout the following instructions.
This YAML file defines the configuration for a Lustre cluster. When the configuration is deployed, it will create a Lustre cluster with the Lustre file system ready to use, including these components:
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