Andrei POPESCU wrote: >> Each LSI card has a 6 bay cage attached and I have raided 6x2TB WD RED >> spinning discs (for data) and 2x1TB WD RED spinning discs (for OS) > > 1TB for OS (assuming RAID1) seems... excessive to me. All my current > installations are in 10 GiB partitions with only a separate /home. > > Even if I'd go "wild" with several desktops installed (I'm only using > LXDE), LibreOffice, etc. I'd probably get away with 50 GiB or so. Check > the output of: > > du -hx --max-depth=1 / > This is true. the root partition is not big - the rest of the space I'll use for data, but I do not want to use smaller disk, because I will loose two bays and have the power consumption anyway. I think 1TB is good compromise. I leave some disk space as spare for LVM and LVM snapshot. I put there the OS and for example the NFS root/boot stuff or some QEMU machines.
>> I somehow can not convince myself that I need to replace any of these >> with SSDs. >> I don't want the cheapest but also not unnecessary expensive drives, I >> just find it hard to evaluate which drives are reliable. > > The reliability matters much less with RAID1. By the way, the "I" in > RAID stands for "inexpensive" ;) > For me it does not matter less, as I do not want to spent time. I had it with Seagate disks before I moved to the WD RED NAS. > If in doubt buy from two different manufacturers with similar specs. > RAID devices should whenever possible be from different batches anyway. > I am too old for blind experimenting. This is why I'm asking if someone has experience with SSD in RAID with consumer grade disks. The once I see are installed in servers are not available on the consumer market. >> I saw there are 1TB WD RED SSDs targeting NAS for about €120,- >> WESTERN DIGITAL WD RED SA500 NAS 1TB SATA (WDS100T1R0A) > > The speed gain of SSD vs. spinning discs for the OS is hard to describe. > Think jet aircraft vs. car. > > I've done this for a laptop (partially out of necessity, after I dropped > it) and it was like buying a new system, even if the processor was > already significantly outdated at the time (one of the first non-Itanium > Intel 64 bit processors). Yes, but as mentioned the LSI I use in the server are SATA2 so it will stick to bandwidth throughput of 300MB/s - does it make sense to replace the good WD RED spinning disks with SSD? I already heard one good argument.
