On 2012-08-24 14:39, Jim Klimov wrote:
Hello all,
The idea of dedicated metadata devices (likely SSDs) for ZFS
has been generically discussed a number of times on this list,
but I don't think I've seen a final proposal that someone would
take up for implementation (as a public source code, at
2012-08-25 15:46, Sašo Kiselkov wrote:
The difference is that when you want to go fetch a block from a metaxel,
you still need some way to reference it. Either you use direct
references (i.e. ARC entries as above), or you use an indirect
mechanism, which means that for each read you will need to
On 08/25/2012 11:53 AM, Jim Klimov wrote:
>> No they're not, here's l2arc_buf_hdr_t a per-buffer structure
>> held for
>> buffers which were moved to l2arc:
>>
>> typedef struct l2arc_buf_hdr {
>> l2arc_dev_t *b_dev;
>> uint64_t b_daddr;
>> } l2arc_buf_hdr_t;
>>
>> That's about 16-bytes overhead p
> No they're not, here's l2arc_buf_hdr_t a per-buffer structure
> held for
> buffers which were moved to l2arc:
>
> typedef struct l2arc_buf_hdr {
> l2arc_dev_t *b_dev;
> uint64_t b_daddr;
> } l2arc_buf_hdr_t;
>
> That's about 16-bytes overhead per block, or 3.125% if the
> block's data is 512
On 08/25/2012 12:22 AM, Jim Klimov wrote:
> 2012-08-25 0:42, Sašo Kiselkov wrote:
>> Oh man, that's a million-billion points you made. I'll try to run
>> through each quickly.
>
> Thanks...
> I still do not have the feeling that you've fully got my
> idea, or, alternately, that I correctly underst
2012-08-25 0:42, Sašo Kiselkov wrote:
Oh man, that's a million-billion points you made. I'll try to run
through each quickly.
Thanks...
I still do not have the feeling that you've fully got my
idea, or, alternately, that I correctly understand ARC :)
There is also relatively large RAM pointer
Oh man, that's a million-billion points you made. I'll try to run
through each quickly.
On 08/24/2012 05:43 PM, Jim Klimov wrote:
> First of all, thanks for reading and discussing! :)
No problem at all ;)
> 2012-08-24 17:50, Sašo Kiselkov wrote:
>> This is something I've been looking into in the
2012-08-24 17:39, Jim Klimov wrote:
Hello all,
The idea of dedicated metadata devices (likely SSDs) for ZFS
has been generically discussed a number of times on this list,
but I don't think I've seen a final proposal that someone would
take up for implementation (as a public source code, at le
First of all, thanks for reading and discussing! :)
2012-08-24 17:50, Sašo Kiselkov wrote:
This is something I've been looking into in the code and my take on your
proposed points this:
1) This requires many and deep changes across much of ZFS's architecture
(especially the ability to sustain t
On Aug 24, 2012, at 6:50 AM, Sašo Kiselkov wrote:
> This is something I've been looking into in the code and my take on your
> proposed points this:
>
> 1) This requires many and deep changes across much of ZFS's architecture
> (especially the ability to sustain tlvdev failures).
>
> 2) Most of
This is something I've been looking into in the code and my take on your
proposed points this:
1) This requires many and deep changes across much of ZFS's architecture
(especially the ability to sustain tlvdev failures).
2) Most of this can be achieved (except for cache persistency) by
implementi
Hello all,
The idea of dedicated metadata devices (likely SSDs) for ZFS
has been generically discussed a number of times on this list,
but I don't think I've seen a final proposal that someone would
take up for implementation (as a public source code, at least).
I'd like to take a liberty of
12 matches
Mail list logo
