Hello Scott, Wednesday, May 24, 2006, 9:42:06 PM, you wrote:
SD> How does (or does) ZFS maintain sequentiality of the blocks of a file. SD> If I mkfile on a clean UFS, I likely will get contiguous blocks for my SD> file, right? A customer I talked to recently has a desire to access SD> large volumes of sequential data. They were concerned about maintaining SD> this file as a string of sequential blocks on disk (for performance SD> reasons) as they update it. SD> This brought up the second part of the question - how does ZFS deal with SD> things that look and feel like directio? When processes update blocks SD> "in place", like a database might do, are new blocks allocated, or the SD> existing blocks left alone? If they are left in place, doesn't that SD> screw around with the transactional nature of ZFS? SD> Is this question at all clear? "updated" blocks will be actually written to new place - so if you update random blocks in a file then reading this file sequentially will not be that sequential. -- Best regards, Robert mailto:[EMAIL PROTECTED] http://milek.blogspot.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
