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Code Issues Releases Wiki Activity

More info about reshape speed.

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Markus Birth 2017-05-29 19:32:42 +02:00
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know-how/hardware/_posts/2017-05-28-speed-up-synology-reshape.md
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@ -3,7 +3,7 @@ title: Speed up Synology volume reshaping
layout: default
language: en
created: 2017-05-28 23:45:40 +0200
updated: 2017-05-28 23:45:40 +0200
updated: 2017-05-29 19:22:31 +0200
toc: false
tags:
- know-how
@ -144,6 +144,29 @@ md3 : active raid5 sdd6[2] sda6[0] sdb6[1]
```
UPDATE
======
After replacing the second disk, there was another *reshape* going on, but this time, the speed
lingered at 20-30 MB/sec which isn't much given that it went up to 80 MB/sec for the first disk.
However, after some more research, I found [this comment](https://www.cyberciti.biz/tips/linux-raid-increase-resync-rebuild-speed.html#comment-20767)
which explained how the system only speeds up to `speed_limit_max` when there's no other disk I/O
going on and otherwise keeps the speed at `speed_limit_min`. That made sense as the default
`speed_limit_min` is `10000` (or 10 MB/sec) and I already increased it to `20000` yesterday.
Why the Synology thought there was other activity and kept the transfer speed down, I don't know.
But now I increased the minimum speed further to 60 MB/s:
sysctl -w dev.raid.speed_limit_min=60000
And suddenly the reshaping speed also increased to around 60 MB/sec. I slightly increased it
further until I ended up at a value of `90000` (90 MB/s) and a real speed of around
80-90 MB/sec.
This cut the remaining time down from 12 hours to 3.
*[MiB]: Mebibyte (1024 KiB), similar to Megabyte (1000 kB)