Cache Containers
Cache Containers
File Cache Consistency
When a file server is used, performance of file I/O can be noticeably degraded relative to local file access because of the delays imposed by the network. Individual systems can use file caches to hold recently accessed file records. Because of the principal of locality, use of a local file cache should reduce the number of remote server accesses that must be made. When a process makes a file access, the request is presented first to the cache of the process`s work station.
If not satisfied there, the request is passed either to the local disk if the file is stored is there, or to a file server where the file is stored. At the server, the server`s cache is first interrogated and if there is a miss then the servers disk is accessed. The dual caching approach is used to reduce communications traffic and disk I/O.
When caches always contain exact copies of remote data, then the caches are consistent. It is possible for caches to become inconsistent when the remote data are changed and the corresponding obsolete local cache copies are not discarded. This can happen if one client modifies a file that is also cached by other clients. The difficulty is actually at two levels. If a client adopts a policy of immediate writing any changes to a file back to the server, then any other client with a cache copy of the relevant portion of the file back will have obsolete data. The problem is made even worse if the client delays writing back changes to the server. The server has an obsolete version of the file, and new file Read requests to the server may contain obsolete data. The problem of keeping local cache copies up to date to changes in remote data is known as the cache consistency problem.
The simplest approach to cache consistency is to use file-locking techniques to prevent simultaneous access to a file by more than one client. This guarantees consistency at the expense of performance and flexibility. A more powerful approach is provided with the facility is Sprite.
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Any number of remote processes may open a file for read and create their own client cache. When an open file request to a server requests Write access and other processes have the file open for Read access, the server takes two actions. It should notify the writing process and maintain cache.
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 Nice Magnetic Geocache Tin Camo Style Complete with Logs More Cache Container  US $5.99
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 Seven Days Nail Polish Cache Set Hot Focus New Reusable Container Glitter Gift US $7.99
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 Seed Pod Regular Sized Geocaching Container Geocache Cache Evil GPS US $7.99
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 Seed Pod Micro Geocaching Container Geocache Cache GPS EVIL US $4.99
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 Lock and Lock 12 QT Container the Classic Cache Container US $3.99
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 Cockroach Micro Geocaching Container Geocache Cache GPS Roach US $4.99
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 7 Geocache Geocaching Cache Aluminum Containers Bison Tubes Tube w Logs US $5.95
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 Red And White Fishing Bobber Micro Geocaching Container Geocache Cache GPS US $5.99
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 Low Profile Pea Gravel Geocaching Container Geocache Cache GPS Stone Rock Evil US $7.99
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 Wood Micro Geocaching Container Geocache GPS Found Cut Stick Log Cache Sneaky US $6.99
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 30 Geocache Geocaching Micro Cache Containers Bison Tubes Cache w Logs US $24.98
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 Pill Cache Container box case Keyring Drug holder VIAL US $.99
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 5 Unique Micro Cache Geocache Geocaching Containers GPS US $1.99
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 13 Sly Micro Pico Cache Geocaching Containers With Logs US $1.49
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 13 Sly Micro Pico Cache Geocache Geocaching Containers US $.99
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 26 Sly Micro Pico Cache Geocache Geocaching Containers US $1.49
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 Crochet Pattern Book CACHE CRITTERS Animals Containers US $3.99
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 Pill Cache Container box case Keyring Drug holder VIAL 7 Days Delivery US $.99
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 6 Geocache Geocaching Containers Bison Cache Tubes Pens US $6.75
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 Lot of 10 Micro Geocache Cache Container w Log 2ml Tan Orange 1 5 8Lx3 8W US $5.95
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 Lot of 3 Micro Geocache Cache Containers w Secured Hook Log US $4.85
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 Lot of 10 Magnetic Micro Geocache Cache Container Neodymium Magnet w Logs US $22.95
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 Lot of 5 Micro Geocache Cache Container w Log 2ml Tan Orange 1 5 8L x 3 8W US $4.25
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 Lot of 2 Camouflage Micro Geocache Cache Containers w Secured Hook Log US $4.35
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 Lot of 20 Micro Geocache Cache Container 2ml Tan Orange 1 5 8Lx3 8W US $11.95
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 12 Micro Cache Containers Geocache Geocaching ASSTD CLR US $9.99
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 60 MICRO Geocache Geocaching Cache Containers Bison Tubes w Logs US $4.95
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 Found Wood Micro Geocaching Container Geocache GPS Stick Log Cache Evil Sneaky US $6.99
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 Evil Black Cable Micro Nano Cache Geocache Geocaching Container Gps US $10.99
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 Evil Screw Micro Cache Geocache Geocaching Container US $8.99
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 60 MICRO Nano Geocache Geocaching Cache Containers Bison Tubes Supplies NEW US $3.95
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 Sly Pine Cone Micro Cache Geocache geocaching Container US $6.99
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 Small Variegated Pink Clay Rose Micro Geocaching Container Geocache Cache GPS US $4.99
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 Pink Clay Rose Micro Geocaching Container Geocache Cache Evil GPS US $4.99
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 Magnetic Micro Cache Slide Tin Camo with Logs Geocache Container Geocaching US $3.99
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 50 Micro Geocache Cache Containers Nano Geocaching Bison Tubes w Logs NEW US $12.99
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 Black Pill Cache Container box Keyring Drug holder VIAL US $.99
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 Geocache Geocaching Container Bison Cache Tubes w Logs Waterproof Holder Case US $5.95
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 THE BOLT micro cache container geocaching GEOCACHE log US $10.99
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 12 Bison Cache Containers Geocache Geocaching FREEELOG US $9.99
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 15 Geocache Geocaching Micro Cache Containers Bison Tubes w Logs NEW US $5.99
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 Keyring Pill Cache Container box case Drug holder Vial US $.99
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 125 Red Reflector Micro Cache Geocaching Container Gps US $4.99
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 GEOCACHING MINI STICK CACHE CONTAINER SNEAKY US $1.98
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 Evil Grass Micro Cache Geocache Container Geocaching US $5.99
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 10 Geocache Container Geocaching Tube Small Cache W LOG US $7.99
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Bear Vault BV500 Bear Resistant Food Canister Head out for a trip into Yosemite or Denali National Park with your food safe and secure in the Bear Vault BV500 Bear Resistant Food Canister. This large-capacity container's 700 cubic inch interior stashes enough supplies for weeklong trips into bear country. An innovative tool-free top gives you quick access to your goodies, and the see-through polycarbonate housing and extra-wide lid make it ea... |
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Backpackers Cache Bear Resistant Container Garcia Machine has pioneered the development of bear resistant food containers. Since 1982 they have worked with wildlife specialists to develop light weight containers that campers can count on to keep their food safe from wild animals. Documented studies have shown that the use of these containers has drastically reduced the seriousness and frequency of camper/bear incidents. Keeping your backpa... |
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Rusty Magnetic Bolt Geocache $10.99 The perfect cache container to blend into urban environments, never to be spotted by the eyes of a muggle! This bolt cache container is 1 and 1/4 inches long, 3/4 inches at the widest point and includes a magnet to stick to metal surfaces. A log sheet is included inside along with a metal toggle to fish the sheet out. The bolt is available in two colors, to fit in with either a silver or rust ... |
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Log Cache - Geocaching $32.99 The original Log Cache! This individually handcrafted natural wood container can hide in plain sight! On closer inspection you will find the Log Cache opens to reveal a compartment for Geocaching swag!... |
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STATE-OF-THE-ART SURVIVAL CACHING - How To Cache Weapons, Ammo, And Almost Anything Else $18.95 This DVD reveals the latest caching techniques and technology, including types of storage containers, low-cost alternatives to commercial containers, container sizes for specific weapons and preparation methods for long-term storage. It also covers methods to thwart metal detectors and sure-fire ways to recall the exact location of your cache.... |
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Nano Geocache Container (Cachemark) - Black $2.99 World famous Joani Designed Custom Made Nano Cache!! Perfect for your local urban Geocaching experience! Extra log included! Our logs are made with Rite in the Rain® paper.Now There is also an O-ring to help keep water out.... |
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Medium Camo Geocache $8.95 This is a 4."x 5.4" x 2.8" tall Lock and Lock all camoed up and ready to go! Contents include the Lock & Lock, small logbook in a strong 4mil strong plastic bag, pencil and Bison Carabiner for starter swag. We use our Special Cache Advance Camouflage Method for painting these Lock and Locks - should stand up to the environment well and many finds.... |
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Micro Geocache: Camo $3.99 Increase the difficulty of your caches with these stylish micro containers. These geocaches are available in six different colors to suit your caching needs. The aluminum, waterproof capsule is also lightweight enough to carry with you.... |
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YuGiOh 5D's 2009 Exclusive Collector's Tin Jack Atlas (XX-Saber Gottoms) Out of Print! $11.99 YuGiOh Tins Sets - Yu-Gi-Oh! Card Game 2009 Collectible Tin Sets! Wow! Bravo to Konami and their committment to making Yugioh the Worlds #1 card game! The announcement for this year's Exclusive 5D's tins was just made and both offers look very attractive... Similar to the tins offered through the Hobby channel, the Exclusive Tins are available on a very limited basis. Themed after The King Jack At... |
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SE Small Pill/ID Holder Keychain (Set of 6) $5.85 ID Holder Comes with key chain Assorted Colors (Red, Blue, Green, Black, Purple & Silver) Includes Plastic Tube Inside Each ID Holder (Not For Medical Use) Size: 1 7/16 in. X 33/64 in.... |