Masrawy Posted April 12, 2017 Share #1 Posted April 12, 2017 What can I do to speed up expand speed? I had 3 X 6TB HDDs + 1 X 128GB SSD all in the same disk group. I added a 4th Seagate Ironwolf 6TB HDD identical to the 3 already in. the rebuild speed is now around 60MBPS. at that speed it will take I remember when I had only 2 HDDs plus the SSD and added a 3rd HDD, the rebuild speed was between 195 and 220MBPS. I already changed sysctl -w dev.raid.speed_limit_min=200000 and sysctl -w dev.raid.speed_limit_max=500000. My CPU and RAM are only around 4% use... What else can I do to speed this up??? I read somewhere to increase stripe_cache_size, but couldn't find how... Any clue or other suggestions? Quote Link to comment Share on other sites More sharing options...
mgrobins Posted April 12, 2017 Share #2 Posted April 12, 2017 http://www.pro-blog.com/fix-synology-long-raid-rebuild-times/ This article is one source. There are a few posts around the web that explain how you can speed it up. Quote Link to comment Share on other sites More sharing options...
Masrawy Posted April 12, 2017 Author Share #3 Posted April 12, 2017 http://www.pro-blog.com/fix-synology-long-raid-rebuild-times/ This article is one source. There are a few posts around the web that explain how you can speed it up. I already did that as explained. But I couldn't find how to modify stripe cache size. Quote Link to comment Share on other sites More sharing options...
fonix232 Posted April 12, 2017 Share #4 Posted April 12, 2017 http://www.pro-blog.com/fix-synology-long-raid-rebuild-times/ This article is one source. There are a few posts around the web that explain how you can speed it up. I already did that as explained. But I couldn't find how to modify stripe cache size. Under "More advanced tweaks": echo 32768 > /sys/block/md3/md/stripe_cache_size Quote Link to comment Share on other sites More sharing options...
Masrawy Posted April 12, 2017 Author Share #5 Posted April 12, 2017 http://www.pro-blog.com/fix-synology-long-raid-rebuild-times/ This article is one source. There are a few posts around the web that explain how you can speed it up. I already did that as explained. But I couldn't find how to modify stripe cache size. Under "More advanced tweaks": echo 32768 > /sys/block/md3/md/stripe_cache_size Thanks for the help, I tried and it didn't do anything unfortunately. Should I put an even higher value? up to how much with the specs I have in my signature? Quote Link to comment Share on other sites More sharing options...
mgrobins Posted April 13, 2017 Share #6 Posted April 13, 2017 Ill try and find the site I used to increase my last rebuild speed but I dont recall it off hand.... I do know that you can increase the CPU utilisation to get it done quicker. It is n't persistent though. Quote Link to comment Share on other sites More sharing options...
H-MAN Posted April 13, 2017 Share #7 Posted April 13, 2017 32768 seems to be the highest value Maybe this site helps https://www.cyberciti.biz/tips/linux-raid-increase-resync-rebuild-speed.html Quote Link to comment Share on other sites More sharing options...
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