Search found 31 matches

by Nick7
Fri Sep 23, 2022 12:27 pm
Forum: Technical Support
Topic: primocache 4.2.0 Hanging on delete cache volume
Replies: 5
Views: 231

Re: primocache 4.2.0 Hanging on delete cache volume

RobF99 wrote: Wed Sep 21, 2022 6:21 pm Yes this has happened to me a few times also. With me it occurs when I reset the cache content.
Yep... happened to me too.
by Nick7
Tue Aug 23, 2022 4:24 pm
Forum: Submit Suggestions
Topic: Exclude processes and extensions from caching
Replies: 1
Views: 135

Re: Exclude processes and extensions from caching

1) PrimoCache works on block level - thus it's unaware of files, filesystems, file extensions, etc 2) PrimoCache is layer between FS and block level, and because of this is unaware of processes accessing it What PrimoCache needs is possibility to set 'maximum sequential' size that will be cached, an...
by Nick7
Sun Jul 31, 2022 2:26 pm
Forum: Technical Support
Topic: How can I measure performance improvements of PrimoCache ?
Replies: 2
Views: 358

Re: How can I measure performance improvements of PrimoCache ?

I will not, as OS also does file caching.
If you keep re-reading same file over and over, it'll be in OS's read cache.

To test: open Task Manager, and check drive holding the file while scripts are running. Close to 0 I/O there at that time.. so there you go.
by Nick7
Tue Apr 05, 2022 9:37 am
Forum: Submit Suggestions
Topic: PrimoCache Review
Replies: 7
Views: 5529

Re: PrimoCache Review

Just please be aware of silent corruption that can occur if using defer write in case of power loss/system crash.
by Nick7
Tue Mar 30, 2021 8:41 am
Forum: Technical Support
Topic: Is caching an iscsi drive good idea?
Replies: 5
Views: 1488

Re: Is caching an iscsi drive good idea?

As long as you do not do any writes (even mount R/W) on other OS, you'll be fine.
Doing any changes on disk, reverting snapshots, etc.. will cause data corruption.
by Nick7
Sat Mar 20, 2021 6:37 pm
Forum: Technical Support
Topic: About Defer-Write and the risk of data loss on power outage
Replies: 11
Views: 3378

Re: About Defer-Write and the risk of data loss on power outage

InquiringMind, NTFS does not support out of order writes. What is does support is journaling, which is completely different thing. Windows also supports delayed writes, but they are journaled and in order. What is out of order write? Example: * You do some I/O, and what needs to be written down is i...
by Nick7
Thu Mar 11, 2021 9:52 pm
Forum: Technical Support
Topic: L2 cache verification
Replies: 11
Views: 2447

Re: L2 cache verification

@Jaga - i partly agree. I agree data integrity should be 1st. This is why using L2 for defer writes can be still safe. Take bcache as an example. It did it right. On the other hand - we also talked here about L2 read cache, and how crash handles that. Saying that L2 'resets' (I know it's wrong word,...
by Nick7
Thu Mar 11, 2021 11:01 am
Forum: Technical Support
Topic: L2 cache verification
Replies: 11
Views: 2447

Re: L2 cache verification

Please note that L2 verification is only to verify L2 data stored right at the last bootup, not the data stored before the ungraceful shutdown. Here is a detailed explaination for this. https://forum.romexsoftware.com/en-us/viewtopic.php?p=15667#p15667 Wow.. that's.. really odd design! I mean, data...
by Nick7
Sun Jan 31, 2021 10:17 pm
Forum: Technical Support
Topic: About Defer-Write and the risk of data loss on power outage
Replies: 11
Views: 3378

Re: About Defer-Write and the risk of data loss on power outage

Are you referring to "write coalescing"? If so, it is a highly useful feature that I have yet to experience problems with. Yes. In normal use it's quite useful feature, I agree. However, problem is in case of sudden power loss. If you write data in order, you can easily recover and discar...
by Nick7
Fri Jan 29, 2021 8:58 am
Forum: Technical Support
Topic: About Defer-Write and the risk of data loss on power outage
Replies: 11
Views: 3378

Re: About Defer-Write and the risk of data loss on power outage

Greatest problem with defer-write is out of order writes. This is what causes greatest issue.
Out of order writes are used to maximize and reduce writes to slow HDD.

Maybe option to disable out of order writes could be added?