On Mon, 8 Jun 2015 09:01:26 AM Wen Lin wrote:
Another key point: A Solid State Drive is worn down relatively quickly by write actions. So this site introduced steps/commands on how to minimise the action of writing to SSD by turning off the updating whenever a file is read (last accessed time) - using the parameter 'noatime'.
It has already been pointed out that relatime is default now. It would be interesting to compare the amount of data written for that vs for other operations. Modern SSDs are designed for significant volumes of disk writes. When you use an SSD as a ZIL for a ZFS filesystem it will get a copy of all data that is written to the entire RAID array. We aren't seeing reports of SSDs failing when used for a ZIL. Some previous analysis of potential SSD lifetimes on this list suggested that they should be good for at least 5 years. If that was the case then they would often outlast hard drives. If your data is important then you will have multiple drives used in some form of RAID array or really good backups (in the case of systems that can't do RAID such as typical laptops). So you shouldn't be particularly worried about the life of SSDs. As with hard drives you can expect them to last long enough that you want bigger ones before they wear out. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/