A new 147 GB disk was recently purchased for t2, which I've installed as
/scratch. The old contents of /scratch and now just on a bigger drive.
Filesystem size used avail capacity Mounted on
scratch2 134G 15G 119G 12% /scratch
I've currently enabled compression on the ZFS file system. It needs further
testing to see if this is a good idea or not. Clearly it saves disk space, but
does uses CPU time to perform the compression.
I was chatting to a Oracle (former Sun) employee about the disk compression last
night. He said in some cases it can actaully be faster with compression on, as
you are writing less data to the disk, so there's less disk I/O.
Apparently the earlier versions of the ZFS file system did not support
multi-threaded compression, whereas the newer versions do. I don't know yet
whether t2 will use multiple threads for the compression or not. Anyway,
compression can be turned on/off very quickly.
There is a shortage of physical memory in t2 now, which is starting to show as
people build packages in parallel. But as you all know, using t2 without
building things in parallel takes forever! I'll try asking William to put in
another 32 GB.
Messages like
Aug 14 23:45:55 t2 tmpfs: [ID 518458 kern.warning] WARNING: /tmp: File system
full, swap space limit exceeded
Aug 15 13:10:10 t2 tmpfs: [ID 518458 kern.warning] WARNING: /tmp: File system
full, swap space limit exceeded
basically mean t2 is out of RAM.
Dave
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