Search found 173 matches

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: 45
Views: 21866

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: 45
Views: 21866

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: 5416

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...
by Axel Mertes
Thu May 23, 2019 12:58 pm
Forum: Technical Support
Topic: PrimoCache flush write cache taking forever?
Replies: 14
Views: 5416

Re: PrimoCache flush write cache taking forever?

The problem is serious.

We just experienced a power outage and due to UPS we can at least try a safe shutdown. For some reasons it still takes forever. We need to analyze this.

Cheers
Axel
by Axel Mertes
Thu May 23, 2019 7:27 am
Forum: Technical Support
Topic: PrimoCache flush write cache taking forever?
Replies: 14
Views: 5416

Re: PrimoCache flush write cache taking forever?

Do you have read/write enabled on the l2 cache? Maybe the L1 cache was getting full and instead of spilling over onto L2 cache it was going straight to HD. Yes, I do have read/write enabled on the l2 cache. The particular cache is 96 GByte of RAM and 480 GByte SSD of Intel Optane P900 memory with 6...
by Axel Mertes
Wed May 08, 2019 5:45 am
Forum: Technical Support
Topic: PrimoCache flush write cache taking forever?
Replies: 14
Views: 5416

Re: PrimoCache flush write cache taking forever?

As I wrote, "flushed n out of m blocks to disk" would be all we need. If n and m is growing, we'll see and understand that.
by Axel Mertes
Tue May 07, 2019 6:01 am
Forum: Technical Support
Topic: PrimoCache flush write cache taking forever?
Replies: 14
Views: 5416

Re: PrimoCache flush write cache taking forever?

I understand that the cache is potentially being used/filled, while flushing it, right? That explains why a percentage is a bit problematic. However, depending on the decision which blocks you flush, you know the final amout of blocks at some point. Even if that amount is growing over time, you know...
by Axel Mertes
Mon Apr 29, 2019 12:24 pm
Forum: Technical Support
Topic: PrimoCache flush write cache taking forever?
Replies: 14
Views: 5416

Re: PrimoCache flush write cache taking forever?

Status:

After about 1.5 hours, PrimoCache finished flush to disk. Changing back to 10s for deferred writes and making a reboot. Will be interesting if performance will be up again or not.
by Axel Mertes
Mon Apr 29, 2019 12:04 pm
Forum: Technical Support
Topic: PrimoCache flush write cache taking forever?
Replies: 14
Views: 5416

Re: PrimoCache flush write cache taking forever?

See here:
PrimoCacheFlushDiskProblem2019-04-29.png
PrimoCacheFlushDiskProblem2019-04-29.png (53.8 KiB) Viewed 3446 times
by Axel Mertes
Mon Apr 29, 2019 11:58 am
Forum: Technical Support
Topic: PrimoCache flush write cache taking forever?
Replies: 14
Views: 5416

Re: PrimoCache flush write cache taking forever?

Hi PrimoCache Support, Windows 2012 Server Datacenter R2 x64. Dual Intel Xeon E5-2620 v2 @ 2.1 GHz, 128 GB RAM. I am experiencing a problem here with PrimoCache server 3.0.9 flushing write cache, taking felt forever. I have a 64 TByte RAID6 volume, 48 TByte netto, single NTFS 64 KByte blocks partiti...