Hi,
> > > > > >[Cut] >SLOG - dedicated device (partition) to hold ZIL on it instead of the pool >(much quicker >than pool -> high iops for sync writes) > > > >first of thanks for writing an informative input. > >as it seems, a person must need 1 SSD for L2ARC and 2xmirrored SSDs for ZIL, >now the >question is do we also need a SSD for SLOG > > > >ZIL is the write cache in memory. SLOG is like a raid1 mirror to ZIL located >on storage. >This could be on dedicated SSD or in a partition on an SSD. In your case it >could be enough to >make some partitions on a reliable SSD and use it for system (ext3/4), L2ARC >(10-100GB?), >SLOG (1-2GB). Please remember, only sync writes goes to ZIL, in the worst case >you lost 5 >seconds of data if the SLOG device dies too. (no rule of thumb, you need to >check your >implementation details) > > >Thanks Fabio, i have a dell workstation 490 and it only support SATAv2 or 3gb >speed. > > >do you guys think by tweaking ZFS a bit and using multiple SSDs for ZIL, L2ARC >and may be >SLOG can give me 4x1GB from each interface. as i mentioned i have 12GB RAM. > > > >No idea. You should play with the tunings (compression, raidz2/3). Too much >variables >(cpu throughput, your pool config, fragmentation of course - COW, IO >direction). I have a >AMD T56N system with 2 x sata port multiplicators with 6x 2.5" hitachi disks, >I can achieve >50MB/sec write to them with no compression - video, but sometimes it droppes >to 10-20MB/sec. > >So, you should test your system and monitor it. > > >we are a small company, not too much reads and writes, we mostly checkin >checkout our >software codes to the VM repositories. >so i think generally we have less IOPS but yes we have huge files in form of >VMs and they >should be backed up every week and snapshot ZFS on daily basis > > > >Raidz2/3 could be ok, depends on numbers of your disks. > > >so with this load what you guys think, can i achieve 4x1gb Ethernet output? > > > >[Cut] > > > > > >
_______________________________________________ pve-user mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
