We can check sector alignment by running gpart list on one of the disks in the gpart list da1Įfimedia: HD(1,GPT,b1c0188e-b098-11ec-89c7-0800275344ce,0x80,0x400000) The layout and size of these reserved sectors will depend on your operating system and partition scheme, but we'll use FreeBSD and GPT for this example because that is what's used by TrueNAS CORE and Enterprise. Next, we want to account for reserved sectors at the start of the disk. Other distributions may create a large or smaller swap partition or might not create one at all.ġ8 * 1000^4 - 2 * 1024^3 = 17997852516352 bytes By default, TrueNAS CORE creates a 2GiB swap partition on every disk in the data pool. If a running process needs more memory than is currently available, the system can unload some of its in-memory data onto the swap space. The swap partition acts as an extension of the system's physical memory pool. Starting with the capacity of the individual drives, we'll subtract the size of the swap partition. It will generally be easier for us to work in bytes so we don't have to worry about conversion between TB and TiB. We'll use 14x 18TB drives in two 7-wide RAIDZ2 (7wZ2) vdevs. Once we understand RAIDZ, understanding mirrored and striped vdevs will be simple. We'll start by picking a less-than-ideal RAIDZ vdev layout so we can see the impact of all the various forms of ZFS overhead. I've found that the best way to get my head wrapped around ZFS allocation overhead is to step through an example. There are layers of overhead that need to be understood and accounted for to get a reasonably accurate estimate. ![]() Because its on-disk structure is so complex, predicting how much usable capacity you'll get from a set of hard disks given a vdev layout is surprisingly difficult. This complexity is driven by the wide array of data protection features ZFS offers. Its on-disk structure is far more complex than that of a normal RAID implementation. To ensure successful synchronization of folder & file permission settings, it is strongly recommended that the SnapSync-paired NAS systems are deployed in an AD/LDAP compliant domain environment to prevent inconsistent system UIDs (especially when the paired NAS includes a QuTS hero NAS and a QES NAS).ZFS RAID is not like normal RAID. These NAS can be paired with each other to provide the perfect backup storage solution. SnapSync is supported by QNAP NAS models featuring the QuTS hero (4.5.2 or later) and QES ( v2.1.1 v11 or later) operating systems. Deployment costs may be higher, but RPO is minimal to achieve real-time disaster recovery. SnapSync requires the primary and secondary NAS to be on the same network (round trip latency < 10ms). If the primary NAS goes offline, IT staff can simply adjust the privilege settings of the secondary NAS for continuous operations, leading to no data loss. The multi-version snapshot files created by the primary NAS can also be synced to the secondary NAS. Each time data is written to the source, it is also identically written to the destination. ![]() Real-time SnapSync immediately synchronizes changes to data with the destination storage. If you… Demand strict data synchronization for critical data backup, use Real-time SnapSync Support Milestone Surveillance Platform.NAS Smart Surveillance System Solutions.NDR Solutions against Targeted Ransomware.Software-defined Platform Total Solution.Support Platform9’s Managed OpenStack Solution.Veeam-Ready and Virtualization Certifications.With Linux and ZFS, QuTS hero supports advanced data reduction technologies for further driving down costs and increasing reliablility of SSD (all-flash) storage. ![]() QuTS hero is the operating system for high-end and enterprise QNAP NAS models. WIth Linux and ext4, QTS enables reliable storage for everyone with versatile value-added features and apps, such as snapshots, Plex media servers, and easy access of your personal cloud. QTS is the operating system for entry- and mid-level QNAP NAS.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |