I am trying to get the hard disk media from Win32_DiskDrive API. However, it returns me all SSD and HDD drives. I want to get only the HDD disks. Is it supported by Win32_DiskDrive API? Below is the query forget all hard disk media.
SELECT * FROM Win32_DiskDrive WHERE MediaType = "Fixed hard disk media"
I've tried the Get-PhysicalDisk in Powershell, with which we can filter HDD drives, but I want it as part of the WQL query. Thanks in advance.
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I am using One node clickhouse with one disk 14TB. Disk path is specified under config.xml
So I want to add new disk and distribute data between disks.
For example
existing disk /DATA capacity 14TB and 12TB data inside it. I want to add new disk /DATA2 and transfer 6TB data from /DATA to /DATA2. At the end of the day size should be /DATA 6TB and /DATA2 6TB and if write request come to clichouse, clickhouse must write data to disk with round robin manner.
In the following article, it says "ordered mode is metadata journaling only but writes the data before journaling the metadata." Does this mean the data is physically written to disk before the metadata is written? From what I understand, data written to a disk is first placed in a cache and then flushed to disk. Or is whether the data was actually written to disk irrevelent to the journaling service?
Is the metadata that is placed in the journal written directly to disk without first being written to a cache?
I am setting up a TimesTen In-Memory database and I am looking for guidance on the storage and location that I should use for the database's persistence files.
A TimesTen database consists of two types of file; checkpoint files (two) and transaction log files (always at least one, usually many).
There are 3 criteria to consider:
a) Data safety and availability (regular storage versus RAID). The database files are critical to the operation of the database and if they become inaccessible or are lost/damaged then your database will become inoperable and you will likely lose data. One way to protect against this is to use TimesTen's built in replication to implement high availability but even if you do that you may also want to protect your database files using some form of RAID storage. For performance reasons RAID-1 is preferred over RAID-5 or RAID-6. Use of NFS storage is not recommended for database files.
b) Capacity. Both checkpoint files are located in the same directory (Datastore attribute) and hence in the same filesystem. Each file can grow to a maximum size of PermSize + ~64 MB. Normally the space for these files is pre-allocated when the files are created, so it is less likely you will run out of space for them. By default, the transaction log files are also located in the same directory as the checkpoint files, though you can (and almost always should) place them in a different location by use of the LogDir attribute. The filesystem where the transaction logs are located should have enough space such that you never run out. If the database is unable to write data to the transaction logs it will stop processing transactions and operations will start to receive errors.
c) Performance. If you are using traditional spinning magnetic media, then I/O contention is a significant concern. The checkpoint files and the transaction log files should be stored on separate devices and separate from any other files that are subject to high levels of I/O activity. I/O loading and contention is less of a consideration for SSD storage and usually irrelevant for PCIe/NVMe flash storage.
Problem description:
I will have regular inserts into a table(lets call it 'daily'), I am planning to build a MV on top of this, I need data from another static table('metadata') .
Option 1: Do a join but that would load the 'metadata' table in memory
Option 2:
How do I limit dictionaries to be on disk and only 'X' bytes loaded in memory?
The dictionary has 600 million rows and takes around 100 GB of memory, I am using low end machines and do not want to use so much RAM.
I am okay with latency.
How do I solve this, is there any setting ?
I have a 16Gb SD where I have a 2Gb partition which I use with a Raspberry Pi. I want to make an image of the SD but only of the partitioned space. I tried to do it with the "Win 32 Disk Imager" but the result is a 16Gb file, so also the non allocated space is copy into the file.
Is there any way to copy only the partitioned space on the image, maybe using Linux utilities? Or is it possible to edit the image file an delete the extra "empty" space?
Thanks!
If you by any chance have an external hard drive you could copy ALL the contents of the Raspberry Pi partition including hidden and operating system files...Then you could delete the partition and merge it with your current partition using a tool like: Minitool Partition Wizard.
Then you could create a system image of your 14GB HDD and copy it to the External HDD and then at last remake the partitions using a partition tool and copy back the contents of your Rasberry Pi partition into the new partition you would have made. Now I do not know what effect this has on registry files so I would try this with caution. I do not know if there are registry files tied to the partition that you cannot copy or see so I would also make a registry backup... Idk if you want to try this but maybe this will help you out.