Search found 180 matches

by Axel Mertes
Mon Jan 24, 2022 2:44 pm
Forum: Technical Support
Topic: Enlightening findings on file compression and PrimoCache
Replies: 12
Views: 5476

Re: Enlightening findings on file compression and PrimoCache

.. 1. PrimoCache L1 cache performs 23% faster than Windows cache on reading uncompressed data! .. This image contains details and results of the performance tests and some more discussion below the image. https://disktrix.com/images/compression.jpg .. Hi Rob, are the read times for Windows cache un...
by Axel Mertes
Wed Jan 12, 2022 12:09 pm
Forum: Technical Support
Topic: SSD Level-2 Cache Size
Replies: 5
Views: 6030

Re: SSD Level-2 Cache Size

Somebody did recommend to use a cache size that is twice the RAM size. But, why not use a much bigger cache and long latency, if you can afford it and you have got power supply that is as fail-safe as an UPS? I don't who and why one would recommend twice the size of RAM as cache. Thats IMHO nonsens...
by Axel Mertes
Sun Jun 13, 2021 2:16 pm
Forum: Technical Support
Topic: CHIA and PrimoCache
Replies: 35
Views: 10884

Re: CHIA and PrimoCache

Interesting, I haven't really followed any new plotters yet, but to me the original implementation always looked pretty slow and un-optimized, without having really looked at the actual code. All the performance I saw, told me there is plenty of room for optimizations. Anyhow, with nearly all free d...
by Axel Mertes
Fri Jun 11, 2021 12:03 pm
Forum: Technical Support
Topic: CHIA and PrimoCache
Replies: 35
Views: 10884

Re: CHIA and PrimoCache

I have done quite a bunch of Chia plotting recently, lik 80 TBytes of plots so far. Outputting over 50 plots per day. My believe is that PrimoCache will bring you no gain in speed, but a gain in SSD lifetime. I use it only for L1 caching and defer writes to 10 seconds, so multiple writes get combine...
by Axel Mertes
Fri May 14, 2021 1:32 pm
Forum: Technical Support
Topic: 100% write back L2 StorageWrite at 0 percent
Replies: 13
Views: 3593

Re: 100% write back L2 StorageWrite at 0 percent

You won't really benefit from caching itself. The cache hit rate when Chia plotting is less than 1% after some more testing here.
However, deferred writes add up significantly and that directly influences the write cycles of the SSD and so its life span.

I see up to 30% deferred writes.
by Axel Mertes
Thu May 13, 2021 11:48 am
Forum: Technical Support
Topic: SSD Level-2 Cache Size
Replies: 5
Views: 6030

Re: SSD Level-2 Cache Size

If you have a rough estimate on how much data you touch per day, like newly written data, old read data, then you have an indication of how much you would need to run via SSD without necessarily touching the HDD at all. I tend to use twice the size of that and that keeps even a server cool... You ca...
by Axel Mertes
Tue May 11, 2021 12:33 pm
Forum: Technical Support
Topic: 100% write back L2 StorageWrite at 0 percent
Replies: 13
Views: 3593

Re: 100% write back L2 StorageWrite at 0 percent

I don't think anything else than a L1 combined read/write RAM cache makes any sense for Chia mining. Given the way that this mining works, it will write really really large chunks of data and the best thing you can do is use a SSD to make that process fast plus use a long deferred block write policy...
by Axel Mertes
Mon Feb 24, 2020 8:12 am
Forum: Latest News
Topic: [2019-12-31] PrimoCache 3.2.0 and 4.0.0 alpha released!
Replies: 101
Views: 63029

Re: [2019-12-31] PrimoCache 3.2.0 and 4.0.0 alpha released!

OK, then an option might be to run a set of hardware RAIDs on the lower level and stripe these on a higher level, allowing an individual SSD cache per lower level RAID set? Lets say I have 4 * RAID6 sets with 8 * 8 TByte drives each, resulting in 4 individual volumes with ~48 TByte net size each (6 ...
by Axel Mertes
Fri Feb 14, 2020 12:52 pm
Forum: Latest News
Topic: [2019-12-31] PrimoCache 3.2.0 and 4.0.0 alpha released!
Replies: 101
Views: 63029

Re: [2019-12-31] PrimoCache 3.2.0 and 4.0.0 alpha released!

Hi Eric, what is the biggest supported L2 cache size in 4.x? We had that 2 TByte limit in the past, and now I see plenty of excessively large U.2 SSDs pop up on ebay, which would do perfectly for large scale L2 caches for very large RAID volumes. Many of those U.2 SSDs are 7.68 TByte in size, so it ...
by Axel Mertes
Thu May 23, 2019 7:38 pm
Forum: Technical Support
Topic: PrimoCache flush write cache taking forever?
Replies: 14
Views: 8943

Re: PrimoCache flush write cache taking forever?

it says you have zero free space for writes on l2 cache and also zero data written to the l2 cache in your pic so for some reason data isn't being written to the l2 cache when the l1 gets full. I was wondering, if L2 might have been full but no recent writes, but you may have found the indication t...