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Отправлено: 13 августа 2015 г. 15:54
Кому: Jan Schermer
Копия: ceph-users@lists.ceph.com javascript:;
Тема: Re: [ceph-users] CEPH cache layer. Very slow
So, good, but price for 845 DC PRO 400 GB higher in about 2x times than
intel S3500 240G (((
Any other models? (((
2015-08-13
So, after testing SSD (i wipe 1 SSD, and used it for tests)
root@ix-s2:~# sudo fio --filename=/dev/sda --direct=1 --sync=1 --rw=write
--bs=4k --numjobs=1 --iodepth=1 --runtime=60 --time_based --gr[53/1800]
ting --name=journal-test
journal-test: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K,
Hi, Igor.
Try to roll the patch here:
http://www.theirek.com/blog/2014/02/16/patch-dlia-raboty-s-enierghoniezavisimym-keshiem-ssd-diskov
P.S. I am no longer tracks changes in this direction(kernel), because we
use already recommended SSD
С уважением, Фасихов Ирек Нургаязович
Моб.: +79229045757
I tested and can recommend the Samsung 845 DC PRO (make sure it is DC PRO and
not just PRO or DC EVO!).
Those were very cheap but are out of stock at the moment (here).
Faster than Intels, cheaper, and slightly different technology (3D V-NAND)
which IMO makes them superior without needing many
So, good, but price for 845 DC PRO 400 GB higher in about 2x times than
intel S3500 240G (((
Any other models? (((
2015-08-13 15:45 GMT+03:00 Jan Schermer j...@schermer.cz:
I tested and can recommend the Samsung 845 DC PRO (make sure it is DC PRO
and not just PRO or DC EVO!).
Those were very
Hi all, we have setup CEPH cluster with 60 OSD (2 diff types) (5 nodes, 12
disks on each, 10 HDD, 2 SSD)
Also we cover this with custom crushmap with 2 root leaf
ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
-100 5.0 root ssd
-102 1.0 host ix-s2-ssd
2
Hi Igor
I suspect you have very much the same problem as me.
https://www.mail-archive.com/ceph-users@lists.ceph.com/msg22260.html
Basically Samsung drives (like many SATA SSD's) are very much hit and miss so
you will need to test them like described here to see if they are any good.
