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Frequently Asked Questions (FAQs)

Q1: Does the cache still work if I close the PrimoCache application? Shall I open and run PrimoCache every time my computer restarts? It seems that PrimoCache does not automatically start with Windows start-up.

A: The data caching keeps working even you exit the PrimoCache application, and automatically starts with Windows startup, until you explicitly stop the caching or uninstall PrimoCache.

Q2: Can I use PrimoCache to cache network mapped drives?

A: No, it can't. PrimoCache can only cache local drives.

Q3: Can I restrict cache to certain folders or files, or can I exclude certain files from cache?

A: No, you cannot. PrimoCache is a block-level caching program, residing below Windows file system drivers. It cannot capture correct file information.

Q4: Is Level-2 cache content persistent across computer restarts?

A: Yes.

Q5: I get an error message saying "Failed to format this volume to the level-2 storage!" while I try to create a level-2 storage volume on a SSD with PrimoCache.

A: See Level-2 Storage FAQ.

Q6: Can I use level-2 cache as a write buffer for HDD disks? I have already enabled Defer-Write and I'd like to utilize the high IOPS of an SSD for writes, only passing them onto the HDD when the HDD is idle.

A: Sorry, level-2 cache cannot store deferred write data. Only level-1 cache can. This means that Defer-Write has no effect if only level-2 cache is set.

Q7: My boot partition is write protected, and I find that contents stored in level-2 storage always become invalid and useless after computer restarts.

A: PrimoCache implements a mechanism to check if cache contents stored in level-2 storage are synced with source disks. It traces and updates flags saved in Windows registry. However if boot partition is write protected, which means that these flags won't be updated, PrimoCache will think that level-2 cache contents are out of sync and reset contents.

Q8: My level-2 cache is almost not working. PrimoCache does not store data to level-2 cache and "L2Storage Write" value increases very slowly.

A: 1) Make sure that the destination volumes you are monitoring are on a different disk than the disk containing the level-2 storage volume. Otherwise, these volumes are automatically bypassed by the level-2 caching as there's no performance boost doing so. 2) You may set the Gather Interval in the advanced level-2 cache options to the value FASTEST (1). 3) If you're using the version 1.x.x, we recommend you upgrade PrimoCache to the latest version.

Q9: What is a good cache size?

A: A good cache size depends on how much data is mostly accessed in your daily activities. Generally, the larger the cache size, the better the cache performance. However, to avoid wasting, you may tune it to a fitting value by checking the Free Cache (L1/L2) after running the computer over a period of time. If the Free Cache is larger than 64MB, you may reduce the cache size. Another thing you shall note is that when you decide the cache size of OS managed memory, you shall leave enough memory for Windows and other applications to run and not use up all available memory.

Q10: What is a good block size?

A: To get the best performance, a block size equal to or less than the cluster size of the volume file system is recommended. However, if you see that the memory overhead is too large with such block size, you may try a bigger block size.

Q11: If I set cache strategy to "Write-data Only", will it increase the risk of data loss? Does it differ from Defer-Write?

A: Cache strategy tells PrimoCache what type of data can be stored into cache. Strategy "Write-data Only" means that PrimoCache only stores write-data into cache storage and bypasses any read-data. It does not indicate that write-data will be delayed in writing to underlying disks. It is decided by Defer-Write function, not Cache Strategy, whether write-data will be immediately written to disks. Therefore, whatever cache strategy you choose, it will not increase the risk of data loss. However, if you enable the Defer-Write function, it will increase the risk.

Q12: What's the difference between PrimoCache and Primo Ramdisk since they both use memory to speed up computers?

A: See Primo Ramdisk Vs. PrimoCache.

Q13: I currently use the former program which is named FancyCache and don't want to upgrade to PrimoCache. Is there a way to buy a license for FancyCache?

A: A license of PrimoCache Desktop Edition can also be used to activate FancyCache. See Buy PrimoCache.