Dne 24. 03. 20 v 23:35 Gionatan Danti napsal(a):
Il 2020-03-24 16:09 Zdenek Kabelac ha scritto:
In past we had problem that when users have been using huge chunk size,
and small 'migration_threashold' - the cache was unable to demote chunks
from the cache to the origin device (the size of
Il 2020-03-24 16:09 Zdenek Kabelac ha scritto:
In past we had problem that when users have been using huge chunk size,
and small 'migration_threashold' - the cache was unable to demote
chunks
from the cache to the origin device (the size of 'required' data for
demotion were bigger then what
Dne 24. 03. 20 v 12:37 Gionatan Danti napsal(a):
Il 2020-03-24 10:43 Zdenek Kabelac ha scritto:
By default we require migration threshold to be at least 8 chunks big.
So with big chunks like 2MiB in size - gives you 16MiBof required I/O
threshold.
So if you do i.e. read 4K from disk - it may
Il 2020-03-24 10:43 Zdenek Kabelac ha scritto:
By default we require migration threshold to be at least 8 chunks big.
So with big chunks like 2MiB in size - gives you 16MiBof required I/O
threshold.
So if you do i.e. read 4K from disk - it may cause i/o load of 2MiB
chunk block promotion into
Dne 23. 03. 20 v 23:02 Scott Mcdermott napsal(a):
On Mon, Mar 23, 2020 at 2:57 AM Zdenek Kabelac wrote:
Dne 23. 03. 20 v 9:26 Joe Thornber napsal(a):
On Sun, Mar 22, 2020 at 10:57:35AM -0700, Scott Mcdermott wrote:
have a 931.5 GibiByte SSD pair in raid1 (mdraid) as cache LV for a
data LV on
On Mon, Mar 23, 2020 at 2:57 AM Zdenek Kabelac wrote:
> Dne 23. 03. 20 v 9:26 Joe Thornber napsal(a):
> > On Sun, Mar 22, 2020 at 10:57:35AM -0700, Scott Mcdermott wrote:
> > > have a 931.5 GibiByte SSD pair in raid1 (mdraid) as cache LV for a
> > > data LV on 1.8 TebiByte raid1 (mdraid) pair of
On Mon, Mar 23, 2020 at 1:26 AM Joe Thornber wrote:
> On Sun, Mar 22, 2020 at 10:57:35AM -0700, Scott Mcdermott wrote:
> > [system crashed, uses all memory when brought online...]
> > parameters were set with: lvconvert --type cache
> > --cachemode writeback --cachepolicy smq
> > --cachesettings
> "Zdenek" == Zdenek Kabelac writes:
Zdenek> Dne 23. 03. 20 v 9:26 Joe Thornber napsal(a):
>> On Sun, Mar 22, 2020 at 10:57:35AM -0700, Scott Mcdermott wrote:
>>> have a 931.5 GibiByte SSD pair in raid1 (mdraid) as cache LV for a
>>> data LV on 1.8 TebiByte raid1 (mdraid) pair of larger
Dne 23. 03. 20 v 9:26 Joe Thornber napsal(a):
On Sun, Mar 22, 2020 at 10:57:35AM -0700, Scott Mcdermott wrote:
have a 931.5 GibiByte SSD pair in raid1 (mdraid) as cache LV for a
data LV on 1.8 TebiByte raid1 (mdraid) pair of larger spinning disk.
these disks are hosted by a small 4GB big.little
On Sun, Mar 22, 2020 at 10:57:35AM -0700, Scott Mcdermott wrote:
> have a 931.5 GibiByte SSD pair in raid1 (mdraid) as cache LV for a
> data LV on 1.8 TebiByte raid1 (mdraid) pair of larger spinning disk.
> these disks are hosted by a small 4GB big.little ARM system
> running4.4.192-rk3399
have a 931.5 GibiByte SSD pair in raid1 (mdraid) as cache LV for a
data LV on 1.8 TebiByte raid1 (mdraid) pair of larger spinning disk.
these disks are hosted by a small 4GB big.little ARM system
running4.4.192-rk3399 (armbian 5.98 bionic). parameters were set
with: lvconvert --type cache
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