Backup Set is the original Retrospect term (still used in Retrospect Windows) for a group-which may have only a single member-of one or more tapes, CD/DVD discs, disks, or a single-member file or a single-member FTP site that serve as the destination individual volumes of 'media' are members of a backup set. Retrospect maintains a separate Catalog File-distinct from any OS-maintained directory-on disk for each backup destination-originally known as a Backup Set. This makes Retrospect distinct from such backup applications as Time Machine and CrashPlan, in which the conceptual 'client' pushes data to a backup 'host' (which may not be a full-fledged computer) at its non-'host'-controlled option. In the network backup scenario a 'backup server' computer host pulls data from host-attached drives and multiple networked workstations-called 'Retrospect clients', according to a host-scheduled script or host-initiated immediate action. Retrospect (originally sold as Retrospect Pro)- the ancestor of what is still sold-adds tape drives and LAN/WAN network backup support.It was the successor to Dantz's DiskFit Direct backup product, which came bundled with Iomega's Zip 100 drive. Retrospect Express-now no longer sold, added support for removable media such as CD/DVD 'discs' and many kinds of 'superfloppy'.Retrospect Express HD-now no longer sold, supported backup to single local and NAS hard drives.This is not a general Windows problem, but just a limitation of certain drivers in the system.Retrospect was both available for retail sale, and was also often bundled with an external hard drive (though often the limited Retrospect Express version). Increasing the default allows for all of the filters to have their own I/O stack location and everyone is happy. ![]() etc.) so the default IRPStackSize isn't large enough. You have too many filters in the particular stack (The number of requests each going through the layers of Antivirus, base filtering engine, ntfs, etc. ![]() A layer of drivers that utilize each other's services are typically referred to as a, "driver stack." Windows uses a layered I/O model, where drivers attach to each other and utilize the services of the underlying driver to perform their work. "I also see random failures to open files in applications that try to access lots of files from the share." ![]() How do I know what the appropriate value is? Or should I just set to to the max of 50? However, why do I need to do this? Why would one Win7 machine have this problem and another not? They are all on the same domain, so group policy pushes down the same settings to them, some of which I've manually verified. I found that increasing the IRPStackSize on both my workstation and the client XP machine seems to make the problems go away. Microsoft publishes a cryptic knowledgebase article on the subject that suggests increasing IRPStackSize to fix the problem without any explanation as to why you would need to do so. I also see random failures to open files in applications that try to access lots of files from the share. I get various errors that seem to come and go (at some points it will work fine for hours). I received a new Windows 7 workstation (replacing an older Windows 7 workstation) and started running into errors accessing my file shares from Windows XP machines.
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