Veritas File System 5.0 Release Notes HP-UX 11i v3 HP Part Number: 5992-1951 Published: May 2008 Edition: 1.
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Table of Contents About this Document..........................................................................................................5 Intended Audience.................................................................................................................................5 Document Organization.........................................................................................................................5 Typographic Conventions....................................................
List of Tables 1-1 1-2 1-3 1-4 1-5 1-6 1-7 4 Application Programming Interfaces (APIs) for FCL ....................................................................8 Features Enabled by HP OnlineJFS...............................................................................................13 Features Enabled by HP Serviceguard Storage Management Licenses........................................13 Memory Usage for a File System With a 1K Block Size..........................................................
About this Document This document describes the Veritas™ File System (VxFS) of the Veritas 5.0 product features supported on HP-UX 11i v3. It also describes product licensing, limitations, system requirements, compatibility with previous product versions and known problems with VxFS 5.0. Intended Audience This document is intended for system administrators responsible for installing and configuring UNIX systems with the Veritas suite of products.
• • • • • • • • • • • • Veritas Volume Manager 5.0 Release Notes Veritas Volume Manager 5.0 Administrator’s Guide Veritas Volume Manager 5.0 Troubleshooting Guide Veritas Volume Manager 5.0 Migration Guide Veritas Enterprise Administrator User's Guide Veritas Storage Foundation 5.0 Cross-Platform Data Sharing Administrator’s Guide Veritas Storage Foundation 5.0 Intelligent Storage Provisioning Administrator’s Guide Veritas Storage Foundation 5.
1 Veritas File System 5.0 Release Notes This chapter describes the new features, licensing, system requirements, compatibility with previous releases and known problems with the Veritas File System 5.0 on HP-UX 11i v3.
fcl_winterval fcl_ointerval Specifies the time in seconds that must elapse before the VxFS FCL records a data overwrite, data extending write, or data truncate for a file. Specifies the time interval in seconds within which subsequent opens of a file do not produce an additional FCL record. This helps to reduce the number of repetitive file-open records logged in the FCL, especially in the case of frequent accesses through NFS. See vxtunefs (1M) manpage, for more information on these tunables.
• Large File Systems and Large File Support The HP OnlineJFS license is required to create file systems over 2 TB and under 32 TB. The EBFS license is required to create file systems over 32 TB. The EBFS license is bundled with HP Serviceguard Storage Management suite. Please contact the HP sales representatives for further information about obtaining this license.
NOTE: Concurrent I/O is not included in Base-VxFS or OnlineJFS. Additional licenses are required. • Nested mount support This feature allows mounting of a VxFS file system on any of the VxFS mount points. A directory on a shared VxFS file system can be used as a mount point for a VxFS file system, enabling nested mounts of shared file systems. NOTE: To enable nested mount support an additional license is required. The nested mounts cannot be enabled with Base-VxFS and HP OnlineJFS.
NOTE: To enable the DST feature an additional license is required. The DST feature is not available with Base-VxFS and HP OnlineJFS. See Table 1-3 for the products which bundle this license. • 2K volumes in a volume set The limit on the number of volumes allowed in a volume set is now increased from 256 to 2048. NOTE: 2K volumes are not supported with Base-VxFS and HP OnlineJFS. See Table 1-3 for the products that bundle this license.
Tuning VxFS for Performance • Tuning down the inode cache VxFS allocates and releases inodes based on the file system load. Generally, larger inode caches help the file system to perform better in the case of a file server or web server load. The global tunable, vx_ninode, determines the maximum possible size of the VxFS inode cache. If the default value of vx_ninode is set to zero, VxFS automatically tunes the size of the inode cache at boot time, based on the size of the physical memory on the system.
Table 1-2 Features Enabled by HP OnlineJFS Feature License Veritas File System HP OnlineJFS File Change Log — logs file system activity for fast incremental backup and auditing.
Table 1-3 Features Enabled by HP Serviceguard Storage Management Licenses (continued) 14 Feature T2771CB T2772CB T2773CB T2774CB T2775CB T2776CB T2777CB File Change Log — Logs file system activity for fast incremental backup and auditing Yes Yes Yes Yes Yes Yes Yes Online FileSystem Yes Operations (fsadm) — File system resize — File system defragmentation — Single file or directory defragmentation — File System intent log resize Yes Yes Yes Yes Yes Yes DMAPI - a VxFS interface Yes t
Table 1-3 Features Enabled by HP Serviceguard Storage Management Licenses (continued) Feature T2771CB T2772CB T2773CB T2774CB T2775CB T2776CB T2777CB Storage Checkpoints and Yes Storage Rollback Instantly create disk-based backups or file systems without adding storage. The backup can be easily restored by the user.
Compatibility With Previous Versions of VxFS The following section discusses the compatibility of VxFS 5.0 with the previous VxFS releases: • The VxFS 5.0 release does not support creating or mounting disk layout version 1, 2, or 3 file systems. HP recommends that you upgrade any previously installed VxFS file system to Disk Layout Version 7 available with VxFS 5.0. An online conversion utility vxupgrade is provided to upgrade existing disk layouts to Disk Layout Version 7 on mounted file systems.
• Problem The write(2) system call does not modify the m_time of a FIFO after some operations are completed on the FIFO. This issue occurs when the owner of the FIFO is different from the process who is writing to it and the writer process has the write permission on the FIFO. When the owner and writer process are the same, or when a root process is writing the FIFO, the m_time is modified appropriately. Also, this problem occurs only with FIFOs. This error does not occur with regular files.
Workaround Avoid large offsets while using mmap. • Problem System hang can occur on systems that have less than 2GB cache memory. Workaround VxFS allocates a fixed amount of memory. You can change the amount of memory allocated using the tunables vx_ninode and vxfs_bc_bufhwm. After long hours of operation, low-memory systems (that is, systems having less physical RAM), may slow down or hang due to memory pressure.
The problems occur after a power failure, SCSI bus reset, or other events in which the disk has cached data, but has not yet written it to non-volatile storage. Contact your disk drive or disk array manufacturer to determine whether your disk drives use a write-back cache, and if the configuration can be changed to disable write-back caching. • Problem Under some conditions, fsadm command cannot truncate a directory with one extent.
Workaround When a file system is mounted, VxFS keeps certain data structures in the kernel. As the size of the file system increases, the amount of data structures stored by VxFS also increases. The file system typically keeps approximately 128 bytes per allocation unit (32,768 file system blocks). This translates to a usage of 512K per 1 TB for an 8K block size file system (4 MB per 1 TB for a 1K block size file system).
The external quota file would need to be manually migrated as follows: — On source: Prior to unmounting the file system, remove the quotas file. Run the fscdsconv command after unmounting the file system. — On target: Mount the file system without quotas. Manually edit the quotas and the quotas.grp file to enter the limits. • Problem Native ACLs will be lost while converting a file system back to the original platform where ACLs are supported, but VxFS ACLs remain intact.
• Problem The -i option of the diskusg command, that is used to ignore the disk usage of the specified file systems, does not work on file systems with Disk Layout Version 7. Workaround No workaround is available for this problem. • Problem Ioctls are not supported on the File Change Log file. Workaround Ioctls are not supported on the File Change Log file.
*5992-1951* Printed in the US
