       %                               DIGITAL    Software Product  Description   C ___________________________________________________________________   C PRODUCT NAME:  Spiralog File System for OpenVMS Alpha  SPD 60.48.01                 Version 1.1   DESCRIPTION   D The Spiralog File System for OpenVMS[TM] Alpha is an optional compo-+ nent of the OpenVMS Alpha operating system.   F Spiralog is an enhanced 64-bit file system that coexists with Files-11F (ODS-2), the original OpenVMS Alpha file system. Spiralog and Files-11D can run simultaneously on the same computer. You can use Spiralog in/ an OpenVMS Cluster or on a standalone computer.    Spiralog provides:  4 o  A radical new approach to organizing data on disk  D Spiralog treats a disk as if it were a sequential device, and writesF all information into a structure called a log. All data is written se-F quentially to the tail of the log. This technique maximizes write per-4 formance by reducing time-consuming disk head seeks.   o  Online backup and restore  D Spiralog provides fast online backup that runs without requiring anyF interruption to applications or users. This reduces the amount of time required to manage your system.   G You can save either a whole volume or the parts that have changed since H a previous save. You can restore either a whole volume or selected files and directories.   o  Enormous scalability   C                                                           July 1996        D Spiralog keeps up with growing data requirements and makes data man-D agement much simpler. It supports 10's of millions of files per vol-C ume by allowing huge directories. It also provides support for huge C files, an order of magnitude larger than those supported by today's 
 file systems.   F o  A high-performance write-behind software cache on each computer us-    ing Spiralog   F The caches are automatically kept coherent throughout an OpenVMS Clus-E ter. Additionally, Spiralog provides cache ordering guarantees to en- 1 sure immediate recovery after a computer failure.   G o  A client-server architecture that provides automatic server failover     in an OpenVMS Cluster  E If the computer serving a Spiralog volume fails, the service automat- D ically fails over to a standby server. This happens transparently toF users; users on other computers continue accessing their data, unaware  that the server has failed over.  G System managers can control the location of servers and standby servers F around the OpenVMS Cluster to maximize I/O throughput and balance disk traffic.  + o  Compatibility with existing applications   F Spiralog supports existing OpenVMS programming interfaces for file ac-H cess, such as Record Management Service (RMS) and run time library (RTL)C functions. There is no need to recompile or relink existing OpenVMS 
 applications.   D o  A Spiralog utility that allows system managers to set up and man-    age Spiralog volumes             "                                  2        RESTRICTIONS  : Spiralog is supported only under the following conditions:  F o  Spiralog must be used with disks that can be considered error-free.F    This requires that the underlying disks must be configured with one    of the following:  6    -  Volume Shadowing for OpenVMS V7.0 (SPD 47.04.xx)  -    -  RAID 5 (host based or controller based)   6 o  Spiralog volumes must run at no more than 80% full.  G o  Serving Spiralog volumes via MSCP to other nodes in an OpenVMS Clus- $    ter environment is not supported.  C o  Access to Spiralog volumes from computers running either OpenVMS D    VAX or versions of OpenVMS Alpha prior to Version 7.0 is provided7    only via network software such as DECnet and DECdfs.    HARDWARE REQUIREMENTS   E o  Each computer on which you install Spiralog or mount Spiralog vol- /    umes must have at least 64 Mbytes of memory.   A o  A Spiralog volume must have a capacity of at least 500 Mbytes.   4 o  Files-11 (ODS-2) must be used as the system disk.   Processors Supported  D Spiralog is supported on all OpenVMS Alpha systems, as documented inC the OpenVMS Operating System for VAX and Alpha Version 7.0 SPD (SPD 
 25.01.xx).          "                                  3        DISK SPACE REQUIREMENTS   E o  Free disk space required for installation: 9200 blocks on the sys-     tem disk   D This size is approximate; the actual size may vary depending on your8 system environment, configuration, and software options.   SOFTWARE REQUIREMENTS   . o  OpenVMS Alpha Operating System Version 7.0.   INSTALLATION  D To install Spiralog you use the POLYCENTER[TM] Software InstallationC (PCSI) utility. This utility is distributed with OpenVMS Alpha Ver- F sion 7.0, and the right to use it is included with the license for the OpenVMS Alpha operating system.  GROWTH CONSIDERATIONS   E The minimum hardware and software requirements for any future version G of Spiralog may be different from the requirements for the current ver-  sion.    ORDERING INFORMATION  , Spiralog Version 1.1 is available on CD-ROM:   o  As a separately ordered kit:   4    -  Software and online documentation: QA-4P7AA-H8  (    -  Printed documentation: QA-4P7AA-GZ  0 o  On the OpenVMS Alpha Software Product Library  D    The online documentation is available on the OpenVMS Alpha Online    Documentation Library.     "                                  4        SOFTWARE LICENSING  E The license rights for Spiralog are included with the license for the  OpenVMS Alpha operating system.  SOFTWARE PRODUCT SERVICES   D Software Product Services for the Spiralog component are included inC the OpenVMS Alpha operating system Software Product Services. A va- E riety of integrated and  la carte hardware and software product ser- C vices are available. For additional information, contact your local ) Digital office or Digital representative.  SOFTWARE WARRANTY   G Warranty for this software product is provided by Digital with the pur- D chase of a license for the OpenVMS Alpha operating system product asG defined in the Software Warranty Addendum of the OpenVMS Operating Sys- & tem for VAX and Alpha Version 7.0 SPD.F The above information is valid at time of release. Please contact your9 local Digital office for the most up-to-date information.   :  1996 Digital Equipment Corporation. All rights reserved.  @ [TM]Digital, OpenVMS, POLYCENTER and the Digital logo are trade-+     marks of Digital Equipment Corporation.                                 "                                  5