Re: [Gluster-users] JBOD / ZFS / Flash backed

On 09/04/18 22:15, Vincent Royer wrote: Thanks, The 3 servers are new Lenovo units with redundant PS backed by two huge UPS units (on for each bank of power supplies).  I think the chances of losing two nodes is incredibly slim, and in that case a Disaster Recovery from offsite backups would

Re: [Gluster-users] JBOD / ZFS / Flash backed

Thanks, The 3 servers are new Lenovo units with redundant PS backed by two huge UPS units (on for each bank of power supplies). I think the chances of losing two nodes is incredibly slim, and in that case a Disaster Recovery from offsite backups would be reasonable. My requirements are about

Re: [Gluster-users] JBOD / ZFS / Flash backed

On 09/04/18 19:02, Vincent Royer wrote: Thanks, I suppose what I'm trying to gain is some clarity on what choice is best for a given application.  How do I know if it's better for me to use a raid card or not, to include flash-cache on it or not, to use ZFS or not, when combined with a small

Re: [Gluster-users] JBOD / ZFS / Flash backed

On 09/04/18 19:00, Vincent Royer wrote: Yes the flash-backed RAID cards use a super-capacitor to backup the flash cache.  You have a choice of flash module sizes to include on the card.   The card supports RAID modes as well as JBOD. I do not know if Gluster can make use of battery-backed

Re: [Gluster-users] JBOD / ZFS / Flash backed

Thanks, I suppose what I'm trying to gain is some clarity on what choice is best for a given application. How do I know if it's better for me to use a raid card or not, to include flash-cache on it or not, to use ZFS or not, when combined with a small number of SSDs in Replica 3. On Mon, Apr

Re: [Gluster-users] JBOD / ZFS / Flash backed

Yes the flash-backed RAID cards use a super-capacitor to backup the flash cache. You have a choice of flash module sizes to include on the card. The card supports RAID modes as well as JBOD. I do not know if Gluster can make use of battery-backed flash-based Cache when the disks are presented

Re: [Gluster-users] JBOD / ZFS / Flash backed

On 09/04/18 16:49, Vincent Royer wrote: Is a flash-backed Raid required for JBOD, and should it be 1gb, 2, or 4gb flash? RAID and JBOD are completely different things. JBODs are just that, bunches of disks, and they don't have any cache above them in hardware. If you're going to

Re: [Gluster-users] JBOD / ZFS / Flash backed

Your question is difficult to parse. Typically RAID and JBOD are mutually exclusive. By "flash-backed", do you mean a battery backup unit (BBU) on your RAID controller? On Mon, Apr 9, 2018 at 8:49 AM, Vincent Royer wrote: > >> Is a flash-backed Raid required for JBOD,

Re: [Gluster-users] JBOD / ZFS / Flash backed

> > > Is a flash-backed Raid required for JBOD, and should it be 1gb, 2, or 4gb > flash? > Is anyone able to clarify this requirement for me? ___ Gluster-users mailing list Gluster-users@gluster.org

Re: [Gluster-users] JBOD / ZFS / Flash backed

thanks for your reply, Yes the VMs are very small and provide only a single service, I would prefer a total of 2TB but 1TB to start is sufficient. Ideally I want a scheme that is easy to expand by dropping an extra disk in each node. When all slots are full, add another node. our current setup

Re: [Gluster-users] JBOD / ZFS / Flash backed

Based on your message, it sounds like your total usable capacity requirement is around <1TB. With a modern SSD, you'll get something like 40k theoretical IOPs for 4k I/O size. You don't mention budget. What is your budget? You mention "4MB operations", where is that requirement coming from?

[Gluster-users] JBOD / ZFS / Flash backed

Hi, Trying to make the most of a limited budget. I need fast I/O for operations under 4MB, and high availability of VMs in an Ovirt cluster. I Have 3 nodes running Ovirt and want to rebuild them with hardware for converging storage. Should I use 2 960GB SSDs in RAID1 in each node, replica 3?