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From: Daniel Janzon <>
To: "" <>
Subject: [linux-lvm] Best way to run LVM over multiple SW RAIDs?
Date: Mon, 16 Dec 2019 08:22:56 +0000	[thread overview]
Message-ID: <> (raw)

> From: Guoqing Jiang <>
>>On 12/7/19 11:44 PM, John Stoffel wrote:
>> As Daniel says, he's got lots of disk load, but plenty of CPU, so the
>> single thread for RAID5 is a big bottleneck.

>Perhaps set "/sys/block/mdx/md/group_thread_cnt" could help here,

Now I finally had a chance to test this. It turns out to work great! It's not as fast as a non-raided linearly allocated LVM volume (about half of performance without getting a fat tail of high read/write response time). So there is a price for redundancy but that is worth it in my application. It's now up there in the same magnitude.

Thanks a lot Guoqing! You really helped me a lot here. I'd also like to thank John Stoffel for valuable input.

             reply	other threads:[~2019-12-16  8:23 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-16  8:22 Daniel Janzon [this message]
  -- strict thread matches above, loose matches on Subject: below --
2019-12-09 10:26 [linux-lvm] Best way to run LVM over multiple SW RAIDs? Daniel Janzon
2019-12-09 14:26 ` Marian Csontos
2019-12-10 11:23 ` Gionatan Danti
2019-12-10 21:29   ` John Stoffel
2019-10-29  8:47 Daniel Janzon
2019-12-07 16:16 ` Anatoly Pugachev
2019-12-07 17:37   ` Roberto Fastec
2019-12-07 20:34     ` Stuart D. Gathman
2019-12-07 22:44       ` John Stoffel
2019-12-07 23:14         ` Stuart D. Gathman
2019-12-08 11:57           ` Gionatan Danti
2019-12-08 22:51           ` John Stoffel
2019-12-09 10:40         ` Guoqing Jiang

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