On 5/14/2011 11:02 AM, Rainer Dorsch wrote: > Am Freitag, 13. Mai 2011 schrieb Miles Fidelman: >> Stan Hoeppner wrote: >>> On 5/12/2011 5:19 AM, Rainer Dorsch wrote:
>>>> Sometimes though something is accessing data on the disk drives, >>>> which I do >>>> not understand. >>> Did you relocate swap to the SSD? >> >> What do you have under root vs. your hard drives. There's lots of stuff >> going on all the time - network activity, mail spools, cron jobs, logging. > > To answer a few questions: > > - I did not relocate swap to SSD, but reduce swapiness: > echo 20 > /proc/sys/vm/swappiness > I have 4 GB or RAM, in most cases that is more than plenty for me. As long > as top shows 0 swap in use, I would think I am safe. Safe for now. > My Main reason for not doing it was that I do run the SSD partitionless to > avoid partition alignment issues. There are no partition alignment issues with SSDs. SSDs have no cylinders, no heads, no mechanical parts. Native sector size is 512B, access time to every sector on the device is uniform--non issue. SSD random read/write access is 10,000x faster than your HDDs so make a small swap file on the SSD--you don't need a partition for swap, use a file. It's brain dead simple. Make a 128MB swap file just so you have some swap to keep the kernel happy. BTW, it is possible to run totally without swap. You just might see some unintended consequences doing so. With 4GB RAM on a workstation it's unlikely though. Anyway, to deactivate and remove the current swap partition, and make a small 128MB swap file on your SSD and activate it: # swappoff -a # dd if=/dev/zero of=/swapfile1 bs=1024 count=131072 # mkswap /swapfile1 # swapon /swapfile1 # vi /etc/fstab Add: /swapfile1 swap swap defaults 0 0 and remove the old swap entry. On reboot only new swap file is used. Linux has had swap file capability for many years, introduced in 2.6. The kernel keeps track of the on disk location of swap files and bypasses the filesystem and buffer cache, performing direct disk access. With modern hardware, whether SSD or hard disk, there is no performance difference between a swap file or partition. Using swap files simply gives you more flexibility--you can add or remove swap anywhere, any time, without needing to dedicate partitions to swap. > - I moved everything on the SSD except some folders in /opt and /home Why haven't you moved those over? > - The inotifywait works nicely :-) So tell us what is accessing the disks already. Lemme guess, some cron job firing a binary in /opt. -- Stan -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4dcec70c.9020...@hardwarefreak.com
