We have been getting conflicting information about LZ1 compresion. Are there issues using it? Should we not use it? What are the pros and cons of using it?
Thanks.
Subject: LZ1 Compression
Hi Leslie. If you upgrade to Domino R6 it will not automatically convert your email existing attachments to LZ1. You will need to use a 3rd party tool such as AttachZIP to convert them as seen below.
FYI
http://www.notesmail.com/AttachZIP
AttachZIP is an attachment compression and archive solution for Lotus Notes which significantly reduces database sizes and network bandwidth on Lotus Domino servers.
Domino Administrators can save Gigabytes or Terabytes of disk space on Domino servers by compressing files in existing Lotus Notes email and application databases. End Users can automatically convert and seamlessly attach files in ZIP format to Lotus Notes email and applications. Attachments are automatically converted on-the-fly to ZIP format when the user clicks the “Send” email button. End Users can use AttachZIP to compress existing files as well in their mail and application databases.
* Convert attachments in each document to compressed ZIP file format
* Re-attach attachments in each document to force native Huffman or LZ1 compression
* Replace attachments in each document with a Document Link to a central repository database containing either compressed ZIP files or the original attachments
* PPMd ZIP option can achieve up to 30% better compression than normal ZIP on many file types
* BZIP2 ZIP option can achieve up to 20% better compression than normal ZIP on many file types
* R5/R6/R7 Compatible
AttachZIP can be used as a migration tool as well when upgrading to Lotus Domino R6. After upgrading to ND6 documents with existing attachments will still use the old Huffman compression even after you flag the database to use the new LZ1 native compression. AttachZIP can convert all these attachments to either LZ1 or ZIP compression.
-Lance
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Subject: LZ1 Compression
We had a problem with LZ1 compression somewhere in the 6.01 to 6.03 timeframe, but it cleared up by the time we went to 6.5. Nobody can tell you whether you “should” use it or not, that’s a business decision you have to make. The pro is it attachments are compressed. The con is there is a performance hit. Turn it on for a database or two (make a backup if you’re paranoid) and see what users say.
Subject: LZ1 Compression
Hi Leslie. If you upgrade to Domino R6 it will not automatically convert your email existing attachments to LZ1. You will need to use a 3rd party tool such as AttachZIP to convert them as seen below.
FYI
http://www.notesmail.com/AttachZIP
AttachZIP is an attachment compression and archive solution for Lotus Notes which significantly reduces database sizes and network bandwidth on Lotus Domino servers.
Domino Administrators can save Gigabytes or Terabytes of disk space on Domino servers by compressing files in existing Lotus Notes email and application databases. End Users can automatically convert and seamlessly attach files in ZIP format to Lotus Notes email and applications. Attachments are automatically converted on-the-fly to ZIP format when the user clicks the “Send” email button. End Users can use AttachZIP to compress existing files as well in their mail and application databases.
* Convert attachments in each document to compressed ZIP file format
* Re-attach attachments in each document to force native Huffman or LZ1 compression
* Replace attachments in each document with a Document Link to a central repository database containing either compressed ZIP files or the original attachments
* PPMd ZIP option can achieve up to 30% better compression than normal ZIP on many file types
* BZIP2 ZIP option can achieve up to 20% better compression than normal ZIP on many file types
* R5/R6/R7 Compatible
AttachZIP can be used as a migration tool as well when upgrading to Lotus Domino R6. After upgrading to ND6 documents with existing attachments will still use the old Huffman compression even after you flag the database to use the new LZ1 native compression. AttachZIP can convert all these attachments to either LZ1 or ZIP compression.
-Lance
★ Crucial tools for IBM Lotus Notes and Domino administration and development…
Find the “crucial tools you need to succeed” including product descriptions, downloads, demos and testimonials.
Download and try the lite (free) version.
Better, stronger, faster productivity for administrators and developers.
Speed up IBM Lotus Notes and Domino administration and development with these crucial software tools.
Subject: LZ1 Compression
Atts will become internally compressed… however the compression ratio is not good enough (zip files are compressed with higher compression ratio).
Main disadvantage is that at the server side, the server may keep compressing and decompressing the attachment continually (e.g. when this att is recovered from Web) so the bandwidth will be saved but the server will be busy… that is the same.
Take a look at a report published at http://www.notes-compression.com about LZ1
Subject: RE: LZ1 Compression
Pablo, do you work for ZipMail? Many of your recent comments have suggested people use it so it’s sounding a little commercial. I don’t mean to offend you, I just want to make sure if you have a connection to ZipMail that it is clear to anyone reading your responses.
Subject: LZ1 Compression
Be aware that LZ1 doesn’t work with the Mac client - if you don’t have any then it shouldn’t be a problem. If you do, then it’s a total no-no.
I would echo the earlier points, saves bandwidth and disk but does increase CPU time for web apps.
Ben