I was interested in the impact the type of an SSD has on the performance of the ZIL. So I did some benchmarking and just want to share the results.
My test case is simply untarring the latest ON source (528 MB, 53k files) on an Linux system that has a ZFS file system mounted via NFS over gigabit ethernet. I got the following results: - locally on the Solaris box: 30 sec - remotely with no dedicated ZIL device: 36 min 37 sec (factor 73 compared to local) - remotely with ZIL disabled: 1 min 54 sec (factor 3.8 compared to local) - remotely with a OCZ VERTEX SATA II 120 GB as ZIL device: 14 min 40 sec (factor 29.3 compared to local) - remotely with an Intel X25-E 32 GB as ZIL device: 3 min 11 sec (factor 6.4 compared to local) So it really makes a difference what type of SSD you use for your ZIL device. I was expecting a good performance from the X25-E, but was really suprised that it is that good (only 1.7 times slower than it takes with ZIL completely disabled). So I will use the X25-E as ZIL device on my box and will not consider disabling ZIL at all to improve NFS performance. -- Peter -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
