On Thu, Mar 2, 2023 at 2:34 AM Roy Sigurd Karlsbakk wrote:
>
>
> - Original Message -
> > From: "Roger Heflin"
> > To: "linux-lvm"
> > Cc: "Malin Bruland"
> > Sent: Thursday, 2 March, 2023 01:51:08
> > Subject: Re: [linux-lvm] lvconvert --uncache takes hours
>
> > On Wed, Mar 1, 2023
Il 2023-03-02 01:51 Roger Heflin ha scritto:
A spinning raid6 array is slow on writes (see raid6 write penalty).
Because of that the array can only do about 100 write operattions/sec.
True. But does flushing cached data really proceed in random LBA order
(as seen by HDDs), rather than trying
On Thu, Mar 2, 2023 at 11:44 AM Gionatan Danti wrote:
>
> Il 2023-03-02 01:51 Roger Heflin ha scritto:
> > A spinning raid6 array is slow on writes (see raid6 write penalty).
> > Because of that the array can only do about 100 write operattions/sec.
>
> True. But does flushing cached data really
Il 2023-03-02 19:33 Roger Heflin ha scritto:
On Thu, Mar 2, 2023 at 11:44 AM Gionatan Danti
wrote:
It is a 100G cache over 16TB, so even if it flushes in order the may
not be that close to each other (1 in 160).
Yes, but destaging in LBA order (albeit far apart) is much better than
in
- Original Message -
> From: "Roger Heflin"
> To: "linux-lvm"
> Cc: "Malin Bruland"
> Sent: Thursday, 2 March, 2023 01:51:08
> Subject: Re: [linux-lvm] lvconvert --uncache takes hours
> On Wed, Mar 1, 2023 at 4:50 PM Roy Sigurd Karlsbakk
> wrote:
>>
>> Hi all
>>
>> Working with a
