Search found 49 matches

by npelov
Wed Apr 08, 2020 10:31 am
Forum: Submit Suggestions
Topic: Compression (with an option to turn it on/off) for cache data
Replies: 1
Views: 191

Compression (with an option to turn it on/off) for cache data

I want to request compression (with an option to turn it on/off, choose algorithm) for cache data (not meta data). ZFS is using compression for it's cache with near zero impact on performance/cpu usage with LZ4 compression - a really high speed algorithm. I don't know what's the license for it, but ...
by npelov
Wed Apr 08, 2020 10:25 am
Forum: Submit Suggestions
Topic: More Detections
Replies: 4
Views: 585

Re: More Detections

I don't know how possible it is to cache network drives (like samba), but caching on the remote computer doesn't do much. If I share RAM drive it's still slow for small files. The bottle neck is the protocol. I don't know why, but it's extremely slow accessing 1000s of small files - like 10 to 100 t...
by npelov
Sun Jan 14, 2018 12:51 pm
Forum: Technical Support
Topic: Problem with prefetch v3.0.2
Replies: 4
Views: 2014

Re: Problem with prefetch v3.0.2

ok, but what about the option to not fetch from more than one partition of a specific physical drive at a time?
by npelov
Sat Jan 13, 2018 12:06 pm
Forum: Technical Support
Topic: Non-deferred write cache
Replies: 5
Views: 2055

Re: Non-deferred write cache

So if the user expects most of the written data to not be read (like log files), then he shouldn't enable write cache. If he expects that soon the written data will be read again (like temporary tables of database) then write cache could be enabled.
by npelov
Sat Jan 13, 2018 12:02 pm
Forum: Technical Support
Topic: Problem with prefetch v3.0.2
Replies: 4
Views: 2014

Problem with prefetch v3.0.2

Hi, I have problem with prefetch. Sometime ago I requested that prefetch of the same physical drive don't happen on the same time to speed it up. In 3.0.2 that's not only not fixed, but it got worse. I have 2 partitions cached C: and E: of the same hard disk. C: is set to start prefetch at windows b...
by npelov
Sat Dec 16, 2017 8:07 am
Forum: Technical Support
Topic: Non-deferred write cache
Replies: 5
Views: 2055

Non-deferred write cache

Does L1 write cache actually do anything if it's not deferred? Does it really speed up anything if it has to write the cache to disk right away. Isn't that the same as if there is no write cache?
by npelov
Sun Sep 10, 2017 7:27 am
Forum: Technical Support
Topic: Pause/Resume prefetch
Replies: 5
Views: 2026

Re: Pause/Resume prefetch

I fixed the problem. The partition was copied 1:1 from an SSD. It has been on the SSD for ages, so it got very fragmented. When I copied it to a HDD booting got so slow that it was past the delay of prefetching. Defragmenting fixed it. Now booting stops before prefetch starts.
by npelov
Wed Sep 06, 2017 8:57 am
Forum: Technical Support
Topic: cache replacement policy
Replies: 2
Views: 1472

cache replacement policy

Hi, Does primocache have an algorithm to reduce penalty of big files that are read only once or full hdd backups? In such case does primocache preserves most commonly used cache? If not you might want to implement something like ARC . In fewer words arc is divided to two sections - one for recently ...
by npelov
Wed Aug 09, 2017 7:53 am
Forum: Technical Support
Topic: Pause/Resume prefetch
Replies: 5
Views: 2026

Re: Pause/Resume prefetch

The SSD is not loosing cache. The SSD itself is disappearing, which is hard disk problem not primocache. The problem I have is with prefetch kicking in the wrong moment, while OS still haven't finished loading. If you have a lot of ram and slow hard disk the OS loading time is bigger and it overlaps...
by npelov
Mon Aug 07, 2017 9:32 pm
Forum: Technical Support
Topic: Pause/Resume prefetch
Replies: 5
Views: 2026

Pause/Resume prefetch

Hi, My SSD died and I've put an old 160 GB HDD for main OS temporarily while I wait for warranty service. The old hdd is terribly slow, especially when seeking. I'm using smaller SSD for L2 cache. I have this problem that prefetch takes forever if L2 cache is not present. I waited 10-20 minutes afte...