Re: Best practices for ZFS setup for a strictly SSD based system?

2016-02-09 Thread Jan Bramkamp
On 09/02/16 16:54, Patrick M. Hausen wrote: Hi, all, while there is quite a bit of documentation on how to improve ZFS performance by using a combination of rotating disks and SSDs, I have not found much about an SSD only setup. We are planning to try a hosting server with 8 SATA SSDs with ZF

Re: Best practices for ZFS setup for a strictly SSD based system?

2016-02-09 Thread Patrick M. Hausen
Hi! > Am 09.02.2016 um 17:32 schrieb Alan Somers : > [...] > http://blog.delphix.com/matt/2014/06/06/zfs-stripe-width/ > >> >> * Will e.g. MySQL still profit from residing on a mirror >>instead of a RAIDZ2, even if all disks are SSDs? > > Yes, because a mirrored vdev has as many r

Re: Best practices for ZFS setup for a strictly SSD based system?

2016-02-09 Thread Alan Somers
On Tue, Feb 9, 2016 at 8:54 AM, Patrick M. Hausen wrote: > Hi, all, > > while there is quite a bit of documentation on how to improve ZFS performance > by using a combination of rotating disks and SSDs, I have not found much about > an SSD only setup. > > We are planning to try a hosting server wi

Best practices for ZFS setup for a strictly SSD based system?

2016-02-09 Thread Patrick M. Hausen
Hi, all, while there is quite a bit of documentation on how to improve ZFS performance by using a combination of rotating disks and SSDs, I have not found much about an SSD only setup. We are planning to try a hosting server with 8 SATA SSDs with ZFS. Things I am not at all sure about: * D

Re: 82576 + NETMAP + VLAN

2016-02-09 Thread Giuseppe Lettieri
Hi all, I have only looked into the fist LOR, which has actually been there for a long time. It should be triggered by the following paths: 1) application does an ioctl(, NIOCREGIF) (or GETINFO) ->netmap_mem_finalize() [locks the netmap allocator] ->contigmalloc() [lock

Re: 82576 + NETMAP + VLAN

2016-02-09 Thread Luigi Rizzo
I am Cc-ing Giuseppe Lettieri who has looked at the problem and may have some comments to share cheers luigi On Mon, Feb 8, 2016 at 9:39 AM, Slawa Olhovchenkov wrote: > On Thu, Feb 04, 2016 at 10:47:34AM -0800, Adrian Chadd wrote: > >> .. but if it does, can you enable witness and see what it re

cooperation

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