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Why speed up Linux software RAID rebuilding and re-syncing? Recently, I build a small NAS server running Linux for one my client with 5 x 2TB disks in RAID 6 configuration for all in one backup server for Linux, Mac OS X, and Windows XP/Vista/7/10 client computers.

Sep 2022. Hi There! Just wondering why the speed to change RAID Types is so slow I'm currently changing from SHR to SHR-2 on my RS2421+ and I have about 29GB of data. My CPU is usually around 1% utilization as per Performance Monitor and my DSM Desktop Read / Write is between 20MB - 30MB in Task Manager.

I've been looking in the RAID resync limits section and I notice 3 options: Lower the impact on overall system performance. Run RAID resync faster. Customize. Right now I've got "Run RAID resync faster" selected, and in resource monitor I see the 3 old drives reading at 80MBps and all 4 are writing at 50MBPs.

Run RAID resync faster. /proc/sys/dev/raid/speed_limit_max= 600000. /proc/sys/dev/raid/speed_limit_min= 300000. As for /sys/block/md2/md/stripe_cache_size(also used to speed up resync) I just checked for all three options and they all come back as 1024(same value as when I check on DSM 6.1.6). ^{Sprawdź listę zgodności produktów Synology, aby zobaczyć, które dyski są zgodne z urządzeniem Synology. Kalkulator RAID Synology zapewnia szacunkowe zużycie pamięci masowej dla konfiguracjami dysków mieszanych i RAID. Systemy Synology wymagają około 10 GB miejsca do wykorzystania w konfiguracjach RAID 1.} In my own experience with Synology and other raid controllers on Windows, it takes about 12-13 hours to rebuild a 2Tb drive and about the double for a 4Tb drive. So in your case, it would take around 2 days for the rebuild of a 8Tb drive. Seems like this how fast the hardware can work these days.

This looks as though it only lets you change the speed_limit_min and speed_limit_max values, but not the stripe_cache_size variable. Still, it'll be nice to be able to set this in DSM and not worry so much about it anymore. Is there any data on what the "Run RAID resync faster" radio button actually changes?

2) Go to Storage Pool 1. 3) Select "Global Settings" button at the top. 4) Adjust the "RAID Resync Speed Limits". See the note: "This setting will affect the speed limit when running data scrubbing, repairing, expanding storage pools, and changing RAID types."

1 Likes Hi everyone, I have a DS916+ running DSM 7.0. I just spend almost 24h for data scrubbing to run on the new 2x 18tb drives in Raid1 with no data on them. While this was happening the CPU was at 0% all the time and I was not doing anything else on the NAS. The process is just as slow on another identical NAS running DSM6

Please follow the steps below to adjust the Resync speed: Go to the Storage page and click Global Settings. In the RAID Resync Speed Limits section, select one of the following speed limit options: Lower the impact on overall system performance (recommended): Select this option to lower the Finding the Problem Fixing the Problem (Temporarily) Improving Performance Inspecting a setup -- do this first if you're new to the hardware you're working on! Links https://www.simplicate.info/2014/05/07/speeding-up-synology-volume-expansion/ Gist by @stevenharman

To set the RAID resync speeds back to the default (recommended) speed via SSH as root: echo 10000 > /proc/sys/dev/raid/speed_limit_min. echo 600000 > /proc/sys/dev/raid/speed_limit_max

Nov 16, 2010 hi synology, is there something on the roadmap, that its possible to set the maximal rsync bandwith to use for network backup? this will be a nice features, if limited bandwiths are available and no QoS functions can be used. i need the feature in the GUI to set this : --bwlimit=500

2tTTRTd.