Slower write with ZIL on SSD
Posted: 29 Apr 2015 17:36
I thought adding the ZIL to a dedicated SSD would improve write speed, but instead it reduces it slightly.
With ZIL
Without ZIL
Is that usually the case? The system I have is a P4 3.2 GHz and 4GB of RAM.
With ZIL
Code: Select all
/usr/bin/time -h dd if=/dev/zero of=sometestfile bs=1024 count=1604800
1604800+0 records in
1604800+0 records out
1643315200 bytes transferred in 39.472788 secs (41631597 bytes/sec)
40.60s real 0.39s user 16.62s sys
Code: Select all
/usr/bin/time -h dd if=/dev/zero of=sometestfile bs=1024 count=1604800
1604800+0 records in
1604800+0 records out
1643315200 bytes transferred in 24.981995 secs (65779982 bytes/sec)
24.99s real 0.44s user 14.79s sys