Need more speed!

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TeeJayHoward

TeeJayHoward

Limpness Supreme
Joined
Feb 8, 2005
Messages
12,271
Code: 
[root@nas Other]# dd if=/dev/zero of=./delete.me bs=1k count=1G
1073741824+0 records in
1073741824+0 records out
1099511627776 bytes (1.1 TB) copied, 5700.26 s, 193 MB/s
[root@nas Other]# zpool status pool
  pool: pool
 state: ONLINE
status: The pool is formatted using a legacy on-disk format.  The pool can
        still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'.  Once this is done, the
        pool will no longer be accessible on software that does not support
        feature flags.
  scan: scrub repaired 0 in 6h44m with 0 errors on Sat Feb 28 06:44:37 2015
config:

        NAME                        STATE     READ WRITE CKSUM
        pool                        ONLINE       0     0     0
          raidz2-0                  ONLINE       0     0     0
            scsi-35000c50034f36cff  ONLINE       0     0     0
            scsi-35000c50034eb58bb  ONLINE       0     0     0
            scsi-35000c50034f44577  ONLINE       0     0     0
            scsi-35000c50034e85e4b  ONLINE       0     0     0
            scsi-35000c50034f422b7  ONLINE       0     0     0
            scsi-35000c50034e85c3f  ONLINE       0     0     0
            scsi-35000c50040cf0c4f  ONLINE       0     0     0
            scsi-35000c500409ae567  ONLINE       0     0     0
            scsi-35000c500409946ff  ONLINE       0     0     0
            scsi-35000c5003c95a907  ONLINE       0     0     0
            scsi-35000c50034fbe17b  ONLINE       0     0     0
            scsi-35000c50034f3dfc7  ONLINE       0     0     0
          raidz2-1                  ONLINE       0     0     0
            scsi-35000c50034f3cc5f  ONLINE       0     0     0
            scsi-35000c50034f3e81f  ONLINE       0     0     0
            scsi-35000c50034ea0857  ONLINE       0     0     0
            scsi-35000c50034ff6167  ONLINE       0     0     0
            scsi-35000c50034f3decf  ONLINE       0     0     0
            scsi-35000c50034f421c7  ONLINE       0     0     0
            scsi-35000c50034f3daeb  ONLINE       0     0     0
            scsi-35000c50034ff1b8b  ONLINE       0     0     0
            scsi-35000c50034f42db7  ONLINE       0     0     0
            scsi-35000c50034f3d3ab  ONLINE       0     0     0
            scsi-35000c50034e011d3  ONLINE       0     0     0
            scsi-35000c5003c95abdf  ONLINE       0     0     0

errors: No known data errors

I've got 24x2TB SAS drives. I'm getting 193MB/s out of my setup (with about 10 VMs idling). 40 gig NICs are getting dirt cheap. I wants them. Ain't no point to buying them when I can't saturate a 10 gig link, though. When I put this together, I figured that I needed about 35TB of space. Turns out, I could be perfectly happy with 20TB. So, let's talk about reconfiguring this beastie to get me the best speed. How do I find out what my bottleneck is?

Usage:
1) Datastore for 10-20 VMs.
2) Storage space for ISOs, documents, movies, etc. I've got everything on here, and I access it daily - mostly streaming video.

I've got a backup solution, so don't worry 'bout that. I just need speed and a little bit of uptime protection. ZFS on CentOS 7, in a VM with 2vCPUs (E3) and 8GB RAM allocated to it. LSI 2308 passed through.
 
You should be able to get 24x100MB/s from your hard drives. Maybe you should access them differently.
 
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