Re: Experiences on BTRFS Dual SSD RAID 1 with outage of one SSD

2018-08-18 Thread Martin Steigerwald
Roman Mamedov - 18.08.18, 09:12: > On Fri, 17 Aug 2018 23:17:33 +0200 > > Martin Steigerwald wrote: > > > Do not consider SSD "compression" as a factor in any of your > > > calculations or planning. Modern controllers do not do it anymore, > > > the last ones that did are SandForce, and that's

Re: Experiences on BTRFS Dual SSD RAID 1 with outage of one SSD

2018-08-18 Thread Roman Mamedov
On Fri, 17 Aug 2018 23:17:33 +0200 Martin Steigerwald wrote: > > Do not consider SSD "compression" as a factor in any of your > > calculations or planning. Modern controllers do not do it anymore, > > the last ones that did are SandForce, and that's 2010 era stuff. You > > can check for yourself

Re: Experiences on BTRFS Dual SSD RAID 1 with outage of one SSD

2018-08-17 Thread Martin Steigerwald
Austin S. Hemmelgarn - 17.08.18, 14:55: > On 2018-08-17 08:28, Martin Steigerwald wrote: > > Thanks for your detailed answer. > > > > Austin S. Hemmelgarn - 17.08.18, 13:58: > >> On 2018-08-17 05:08, Martin Steigerwald wrote: […] > >>> Anyway, creating a new filesystem may have been better here >

Re: Experiences on BTRFS Dual SSD RAID 1 with outage of one SSD

2018-08-17 Thread Martin Steigerwald
Hi Roman. Now with proper CC. Roman Mamedov - 17.08.18, 14:50: > On Fri, 17 Aug 2018 14:28:25 +0200 > > Martin Steigerwald wrote: > > > First off, keep in mind that the SSD firmware doing compression > > > only > > > really helps with wear-leveling. Doing it in the filesystem will > > > help

Re: Experiences on BTRFS Dual SSD RAID 1 with outage of one SSD

2018-08-17 Thread Martin Steigerwald
Austin S. Hemmelgarn - 17.08.18, 15:01: > On 2018-08-17 08:50, Roman Mamedov wrote: > > On Fri, 17 Aug 2018 14:28:25 +0200 > > > > Martin Steigerwald wrote: > >>> First off, keep in mind that the SSD firmware doing compression > >>> only > >>> really helps with wear-leveling. Doing it in the

Re: Experiences on BTRFS Dual SSD RAID 1 with outage of one SSD

2018-08-17 Thread Austin S. Hemmelgarn
On 2018-08-17 08:50, Roman Mamedov wrote: On Fri, 17 Aug 2018 14:28:25 +0200 Martin Steigerwald wrote: First off, keep in mind that the SSD firmware doing compression only really helps with wear-leveling. Doing it in the filesystem will help not only with that, but will also give you more

Re: Experiences on BTRFS Dual SSD RAID 1 with outage of one SSD

2018-08-17 Thread Austin S. Hemmelgarn
On 2018-08-17 08:28, Martin Steigerwald wrote: Thanks for your detailed answer. Austin S. Hemmelgarn - 17.08.18, 13:58: On 2018-08-17 05:08, Martin Steigerwald wrote: […] I have seen a discussion about the limitation in point 2. That allowing to add a device and make it into RAID 1 again

Re: Experiences on BTRFS Dual SSD RAID 1 with outage of one SSD

2018-08-17 Thread Roman Mamedov
On Fri, 17 Aug 2018 14:28:25 +0200 Martin Steigerwald wrote: > > First off, keep in mind that the SSD firmware doing compression only > > really helps with wear-leveling. Doing it in the filesystem will help > > not only with that, but will also give you more space to work with. > > While also

Re: Experiences on BTRFS Dual SSD RAID 1 with outage of one SSD

2018-08-17 Thread Martin Steigerwald
Thanks for your detailed answer. Austin S. Hemmelgarn - 17.08.18, 13:58: > On 2018-08-17 05:08, Martin Steigerwald wrote: […] > > I have seen a discussion about the limitation in point 2. That > > allowing to add a device and make it into RAID 1 again might be > > dangerous, cause of system

Re: Experiences on BTRFS Dual SSD RAID 1 with outage of one SSD

2018-08-17 Thread Austin S. Hemmelgarn
On 2018-08-17 05:08, Martin Steigerwald wrote: Hi! This happened about two weeks ago. I already dealt with it and all is well. Linux hung on suspend so I switched off this ThinkPad T520 forcefully. After that it did not boot the operating system anymore. Intel SSD 320, latest firmware, which

Experiences on BTRFS Dual SSD RAID 1 with outage of one SSD

2018-08-17 Thread Martin Steigerwald
Hi! This happened about two weeks ago. I already dealt with it and all is well. Linux hung on suspend so I switched off this ThinkPad T520 forcefully. After that it did not boot the operating system anymore. Intel SSD 320, latest firmware, which should patch this bug, but apparently does not,