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Slow Identification of Storage Devices Such as USB Flash Drives in FusionAccess V100R005

Publication Date:  2014-05-15 Views:  45 Downloads:  0
Issue Description
After some USB flash drives or hard disks are inserted into a TC, a VM takes 1 to 2 minutes or even longer to identify these storage devices.
Alarm Information
None
Handling Process
To prevent this fault, perform the following operations:
1. Copy the user data on the USB flash drive or hard disk to a physical machine for backup. Format the USB flash drive from FAT32 into NTFS, and then copy the user data back to the USB flash drive.
2. During the disk formatting, set Allocation unit size to the maximum value.
3. If the operating system asks you to repair USB flash drive, click Repair.
4. Each time when you finish using the U flash drive, do not remove it forcibly. Click Safely Remove in the lower right corner of the desktop to remove it as prompted.
Root Cause
1. When identifying a USB flash drive, the VM scans the entire file system on the USB flash drive. In this case, a large number of I/O instructions need to be sent to the TC, which increases the delay.
2. If the operating system detects that the USB flash drive hardware is abnormal, such as bad sectors, the scanning time increases. The operating system asks the user to perform security recovery, which also increases the delay.
3. The operating system considers that the USB flash drive is abnormal largely because the USB flash drive is forcibly removed last time.
Suggestions
None

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