Re: btrfs across a mix of SSDs HDDs

2012-05-02 Thread Martin
Thanks for good comments. Is the OP using Oracle Linux? He didn't say. But he didn't say he WON'T be using oracle linux (or other distro which supports btrfs) either. Plus the kernel can be installed on top of RHEL/Centos 5 and 6, so he can easily choose either the supported version, or

Re: btrfs across a mix of SSDs HDDs

2012-05-02 Thread Duncan
Martin posted on Wed, 02 May 2012 15:00:59 +0100 as excerpted: Multiple pairs of HDD paired with SSD on md RAID 1 mirror is a thought with ext4... FWIW, I was looking at disk upgrades for my (much different use case) home workstation a few days ago, and the thought of raid1 across SSD and

Re: btrfs across a mix of SSDs HDDs

2012-05-02 Thread viv...@gmail.com
Il 02/05/2012 20:41, Duncan ha scritto: Martin posted on Wed, 02 May 2012 15:00:59 +0100 as excerpted: Multiple pairs of HDD paired with SSD on md RAID 1 mirror is a thought with ext4... FWIW, I was looking at disk upgrades for my (much different use case) home workstation a few days ago, and

Re: btrfs across a mix of SSDs HDDs

2012-05-02 Thread Duncan
viv...@gmail.com posted on Thu, 03 May 2012 01:54:01 +0200 as excerpted: Il 02/05/2012 20:41, Duncan ha scritto: Martin posted on Wed, 02 May 2012 15:00:59 +0100 as excerpted: Multiple pairs of HDD paired with SSD on md RAID 1 mirror is a thought with ext4... FWIW, I was looking at disk

btrfs across a mix of SSDs HDDs

2012-05-01 Thread Martin
How well does btrfs perform across a mix of: 1 SSD and 1 HDD for 'raid' 1 mirror for both data and metadata? Similarly so across 2 SSDs and 2 HDDs (4 devices)? Can multiple (small) SSDs be 'clustered' as one device and then mirrored with one large HDD with btrfs directly? (Other than using

Re: btrfs across a mix of SSDs HDDs

2012-05-01 Thread sam tygier
On 01/05/12 20:35, Martin wrote: The idea is to gain the random access speed of the SSDs but have the HDDs as backup in case the SSDs fail due to wear... Have you looked at the bcache project http://bcache.evilpiepirate.org/ sam -- To unsubscribe from this list: send the line unsubscribe

Re: btrfs across a mix of SSDs HDDs

2012-05-01 Thread Bardur Arantsson
On 05/01/2012 09:35 PM, Martin wrote: How well does btrfs perform across a mix of: 1 SSD and 1 HDD for 'raid' 1 mirror for both data and metadata? Similarly so across 2 SSDs and 2 HDDs (4 devices)? Can multiple (small) SSDs be 'clustered' as one device and then mirrored with one large HDD

Re: btrfs across a mix of SSDs HDDs

2012-05-01 Thread Bardur Arantsson
On 05/02/2012 06:28 AM, Fajar A. Nugraha wrote: On Wed, May 2, 2012 at 9:22 AM, Bardur Arantssons...@scientician.net wrote: On 05/01/2012 09:35 PM, Martin wrote: From Kconfig: Btrfs filesystem (EXPERIMENTAL) Unstable disk format ^^