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Recent content by csmcsm

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    big zfs ssd problem - zil/l2arc max 2500 iops

    no, sorry this is 100% not possible for us. as I mentioned, we have 100s of VMs on our san - we cant have any inconsistency what so ever (to repair them would be a nightmare for us, to some of the VMs we don't even have the root pwd which is need to fix/fsck them).
  2. C

    big zfs ssd problem - zil/l2arc max 2500 iops

    Hi, first of all, thanks a lot for your detailed answer. I really appreciate it, and I don't want to look like a smartass, but I have some notes/questions (see below ///):
  3. C

    big zfs ssd problem - zil/l2arc max 2500 iops

    btw, a side note - reading speed is perfect (I tested it, the ssd disks showed me 10-12k iops each at read if I use them as read-cache) - just write speed is still the issue.
  4. C

    big zfs ssd problem - zil/l2arc max 2500 iops

    thanks for the good answer!! it also explains why the VMA3205/vma3210 san (which is not a ssd disk, it is a san with extreme low latency and extreme fast speed) still not get more than the 2500 iops out.. and it (maybe) explains also why the same ssd disks used as regular pool disks are...
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    big zfs ssd problem - zil/l2arc max 2500 iops

    ah, yes I know now what you refer to, well the iops was better, but there was actually no data written anymore :-) it looked on zpool iostat like 20k iops and 100mb/s - but on the testing server (where I run dd and iozone) it showed only like if it writes a few kb/s - and on the storage itself...
  6. C

    big zfs ssd problem - zil/l2arc max 2500 iops

    increase the settings only helped in regards to faster l2arc filling (so no 8mb limit is there anymore) - but not in regards to iops, only in regards to throughput, and because zil not need throughput but needs iops, this had no impact on iops at all)
  7. C

    big zfs ssd problem - zil/l2arc max 2500 iops

    Im not talking about L2ARC - I already increased writeboost to 400mb/s and average to 200mb/s and it works perfect. (please see at bottom of that post my /etc/system) to clarify, I don't have any throughput problem (I get about 350mb/s each of the ssd disks - so for 4 disks in one pool I get...
  8. C

    big zfs ssd problem - zil/l2arc max 2500 iops

    just checked with solaris 11.1 - same problem - I cant get out more than 2500 iops from a pool, if I ad one (basic)disk or if I add 6 (basic) disk - total is 2500 iops...
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    big zfs ssd problem - zil/l2arc max 2500 iops

    I will try, but we tested solaris 11.0 and there the issue was the same.
  10. C

    big zfs ssd problem - zil/l2arc max 2500 iops

    btw, a funny thing i found out while testing: if i change some paramenters: echo zfs:zfs_no_write_throttle/W0t0 | mdb -kw echo zfs_write_limit_override/W0t1 | mdb -kw i saw all of the sudden 7k write iops for one device, if i added 2 more i came to 20k write iops (so that would be...
  11. C

    big zfs ssd problem - zil/l2arc max 2500 iops

    well thanks for the answer, but i think you missunderstood me. 1) i tested it with 400gb slc ssd disks - 2500 iops for the whole pool (if i add one 400gb disk or 6 - all 6 without zraid, just to see single disk performance) 2) if i create seperate pools with one 400gb disk each - each pool...
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    big zfs ssd problem - zil/l2arc max 2500 iops

    there is pretty much nothing faster to get than this ssd disks, also as a side note, i also tested performance for a volume and as zil device a Violin Memory VMA storage (lowest latency, 350k iops is what i get out on a windows storage server with that device) so its for sure not latency...
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    big zfs ssd problem - zil/l2arc max 2500 iops

    hello, I played around with zfs for several weeks (I used openindiana and onmios to test) and I have a very strange issue. if i add a zil device (a hitachi 400GB SLC SSD 4gb fc) to my pool and set sync=always, the zil device get (depending on the block size) 30-90mbits throughput BUT iops...
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