usn

Is the USN journal disabled by default?

由 梦想与她 提交于 2020-01-07 06:20:22
问题 In my backup application I am using USN journal to check changes to the volume. By default USN is disabled or enabled? In this link (old article)it was mentioned like "By default, an NTFS volume will have its Change Journal disabled" .I didn't get much information about it in any website. Is it really disabled on NTFS drive or Is it based on OS? It's important to me because I use it in my application. 回答1: It's generally on in Windows XP, Vista, 7, 8, Server 2003, Server 2008, and Server 2012

Estimate the number of USN records on NTFS volume

由 拟墨画扇 提交于 2019-12-18 03:44:43
问题 When the USN journal is used for the first time, the volume's entire set of USN records must be enumerated using the FSCTL_ENUM_USN_DATA control code. This is usually a lengthy operation. Is there a way to estimate the number of records on the volume prior to running it, so progress can be displayed? I'm guessing the USN data for the entire volume is generated from the MFT, with one record per file (approximately). So perhaps a way to estimate the number of active files in the MFT would work.

Estimate the number of USN records on NTFS volume

由 泄露秘密 提交于 2019-12-18 03:44:22
问题 When the USN journal is used for the first time, the volume's entire set of USN records must be enumerated using the FSCTL_ENUM_USN_DATA control code. This is usually a lengthy operation. Is there a way to estimate the number of records on the volume prior to running it, so progress can be displayed? I'm guessing the USN data for the entire volume is generated from the MFT, with one record per file (approximately). So perhaps a way to estimate the number of active files in the MFT would work.

Know the number of files / directories before doing a FSCTL_ENUM_USN_DATA

由 ぐ巨炮叔叔 提交于 2019-12-08 08:47:02
问题 Before doing a USN journal / NTFS MFT files-enumeration with while (DeviceIoControl(hDrive, FSCTL_ENUM_USN_DATA, &med, sizeof(med), pData, sizeof(pData), &cb, NULL)) { // do stuff here med.StartFileReferenceNumber = *((DWORDLONG*) pData); // pData contains FRN for next FSCTL_ENUM_USN_DATA } I'd like to know the number of files/directories (to "reserve" a std::vector: v.reserve(...) and also other reasons). I thought about using FSCTL_QUERY_USN_JOURNAL before, that gives a USN_JOURNAL_DATA_V0

Estimate the number of USN records on NTFS volume

由 ♀尐吖头ヾ 提交于 2019-11-29 02:34:59
When the USN journal is used for the first time, the volume's entire set of USN records must be enumerated using the FSCTL_ENUM_USN_DATA control code. This is usually a lengthy operation. Is there a way to estimate the number of records on the volume prior to running it, so progress can be displayed? I'm guessing the USN data for the entire volume is generated from the MFT, with one record per file (approximately). So perhaps a way to estimate the number of active files in the MFT would work. You can use FSCTL_GET_NTFS_VOLUME_DATA to get the length in bytes of the MFT. If you compare this to
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