In most cases write speed increases of 100-200% can be obtained simply by changing the maximum block size written to tape from the software default (usually 64kB) to 1MB. _Much_ greater gains in write speeds can be obtained by increasing the “blocking factor” if writing tarfiles, or using larger maximum block sizes and file sizes if using backup software such as Amanda or Bacula. There is _no_ good reason to disable hardware compression in any modern tape drive (The last drives which were guilty of the stated behaviour were DDS-2 DAT format) ” in some compression algorithms may cause the written data to tape to be larger than the original data.”Īll drives made in the last 20 years which have hardware compression will switch the compression off and write blocks directly if expansion occurs. Sometimes you can switch it on by an extra jumper on the corpus or through a program via the operating system. If a compression functionality for your drive is not enabled as “default”, you may turn on it in a few ways depending on the drive. Typically default hardware compression is turned on, but this is not a set rule. Also, in this case, the real speed is dependent on the extent to which data will be compressed. With 2:1 compression ratio of this speed is doubled. For example, the tape drive has a native speed of 120MB/s. This speed is greater when the compression ratio is better. The compression ratio is also related to the speed obtained during operations on magnetic tape. When you use hardware compression, you can write more than 800GB. Not use hardware compression, then with LTO-4 tape, you can write 800GB maximum. If the compression ratio is 2:1, then the compressed capacity is 1600GB (in theory). Written smaller font – a native data capacity.įor example, a tape that is LTO-4 (Linear Tape-Open 4 generation) has a native capacity of 800GB.Written large font – a compressed capacity.Magnetic tapes manufacturers provide two tape capacities: Still, if you are going to write pre-compressed data (for example, multimedia data types such as mpg, jpg, mp3, etc.), this ratio will be very poor and in some compression algorithms may cause the written data to tape to be larger than the original data. For uncompressed data types (such as txt, bmp, etc.), the real ratio may be near 2:1. That depends on the type of data that you are writing onto tape. In fact, the compression ratio of 2:1 may be really equal to 1.2:1 or 1.6:1 or another ratio. This means that if we would write 2MB data to a tape, then the drive will compress the data, and you will have only 1MB saved of compressed data on the tape. Also, it is transparent to the operating system, and data is compressed “on the fly.” Usually, the compression ratio for magnetic tape drives is 2:1. The hardware compression is much faster than software compression because, as opposed to software compression, it does not use a computer processor which draws from resources. In many cases, this feature may prove very useful. This makes data compression available to the magnetic tape by a drive. Most present tape drives include a function called hardware compression. Iperius is easy to use, reliable, fast, and supports any tape drive, starting from the common HP DAT 72/160/320 USB/SCSI, to DLT/SDLT, and up to the high-capacity LTO 5 and LTO 6, that allows to back up hundreds of gigabytes.Hardware Compression in a Backup With Tape Drives Tape backup software compatible with Windows Server 2008 and Windows Server 2012. You can also restore individual files, mount the image as a virtual machine, and restore the system to a dissimilar hardware (bare metal restore). Iperius can make images of the system disk, allowing to recover a server with a few clicks. Disk imaging backup software, that allows to save the whole operating system with a fast block-level backup. The cloud backup configuration requires only a few clicks, and it guarantees the security of automatic remote backups. Iperius Backup can make backups to Google Drive, OneDrive and Dropbox. it includes a Web Console to monitor all the backups, run backup jobs remotely, and update the program remotely. Tape backup software, DAT backup, LTO backup software, NAS backup, RDX drives, USB backup, zip compression, AES 256 bit encryption, virtual machines VMWare ESXi backup, Hyper-V backup, online backup, database backup (Oracle, SQL Server, MySQL, MariaDB, PostgreSQL), FTP backup, FTP Download and synchronization, Website backup, Dropbox, Google Drive, OneDrive, Azure Storage, Amazon S3 (remote backup), installable as Windows service, e-mail notifications, synchronization and open file backup. Iperius Backup is one of the most flexible and complete software to backup and protect your files and your reserved data.
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