Operativni SiSTEMi 1(Drugi Kolokvijum 2 Deo)

The maximum degree of concurrency for a RAID 6 with 4 disks is 4. This means that up to 4 independent read or write operations can be performed simultaneously on the disks in the RAID array. RAID 6 uses dual parity, which allows for the failure of up to 2 disks without losing data. The degree of concurrency is determined by the number of independent data stripes that can be accessed concurrently, and in this case, it is limited to 4.

RAID 5 is a type of RAID (Redundant Array of Independent Disks) that uses block-level striping with distributed parity. It requires at least three disks and provides fault tolerance by distributing parity information across all drives. This allows for the recovery of data even if one disk fails. RAID 5 offers a good balance between performance, storage capacity, and data protection, making it a popular choice for many applications.

The correct answer is "samo u prvoj fazi" because the question states that the Ci coordinator is requesting the stations to be prepared. This implies that the request is only applicable during the first phase and not in the second phase or in both phases.

This question is asking to identify the term for "Trojan Horse," "TrapDoor," and "Stack or Buffer Overflow." The correct answer is "Programske pretnje" which translates to "Program Threats" in English. These terms refer to various types of malicious software or vulnerabilities that can be exploited by hackers to compromise a computer system or network.

The given options represent different types of columns. ACL stands for Access Control List, which is a column used to manage permissions and access rights for objects or resources.

RAID 3 is the correct answer because it uses parity for fault tolerance. In this RAID configuration, data is striped across multiple drives, and a dedicated drive is used for storing parity information. This allows for the recovery of data in case of a single drive failure. The parity information is used to reconstruct the missing data.

Raid 5 is the correct answer. RAID stands for Redundant Array of Independent Disks, and RAID 5 is a type of RAID configuration that uses striping with distributed parity. In RAID 5, data is distributed across multiple disks, and parity information is also distributed across the disks. This provides both data redundancy and improved performance. If one disk fails, the data can be reconstructed using the parity information stored on the remaining disks. RAID 5 is commonly used in environments where a balance between performance and data protection is required.

The given question states that a RAID 1 has been created with four disks. RAID 1 is a mirrored configuration where data is duplicated across multiple disks. In this case, since there are four disks, only half of the total storage capacity is usable for data storage, as the other half is used for mirroring. Therefore, the storage efficiency in this scenario is 50%.

The answer "Transakcije sigurno nisu u konfliktu" is correct because all the transactions mentioned in the question are read transactions. Read transactions do not modify the data, so they do not conflict with each other. Therefore, it can be concluded that the transactions are definitely not in conflict.

The correct answer is "Transakcija upisuje podatke u log-a kao u zapis Q." This means that the transaction writes data into the log in the same way as it writes into the record Q.

The correct answer is DCD (Disk Caching Disk). This is because the question is asking for the special form of file system caching in DS, and DCD is the only option that refers to disk caching specifically. The other options, DC, RC, and NC, do not specify the type of caching being used.

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The process from domain D2 cannot copy its execute permission to file F3 in domain D3.

The correct answer is "protection" because the image is most likely depicting a concept related to safeguarding or ensuring the safety of something. This can be inferred from the term "protection and security" mentioned in the options, which suggests that the image is related to protecting or securing something.

The correct answer states that "Da imate pravo da po vertikali menjate prava" which translates to "You have the right to change rights vertically." This suggests that the concept of ownership is related to the ability to vertically change rights.

The given answer indicates that the RAID 6 configuration has excellent random read performance (RR5), average random write performance (RW1), excellent sequential read performance (SR5), and average sequential write performance (SW3). This means that the RAID 6 array performs well when it comes to reading data randomly and sequentially, but it may not perform as efficiently when it comes to writing data randomly.

The correct answer is 5 because the question is asking about the number of components in a full name file on DS. A full name file typically consists of a file name and its extension, which counts as two components. Additionally, there may be three more components, such as a directory, a subdirectory, and a root directory. Therefore, the total number of components in the file name is 5.

After a temporary system failure, for each transaction in which both the Ti start and Ti commit exist, the redo(Ti) operation is performed. This means that any changes made by the transaction that were not saved due to the system failure will be reapplied. This ensures that the system remains consistent and all transactions are properly executed.

The correct answer is Raid 4 because it is the only option that matches the given question. The question asks "Koji je ovo raid?" which translates to "What is this raid?" and the correct answer is Raid 4.

RAID 5 uses striping with parity across multiple disks to provide fault tolerance and performance improvement. In this case, a RAID 5 with four disks is created. The maximum degree of concurrency for this RAID is 4, which means that it can handle up to four simultaneous small requests together. Each disk in the RAID can independently handle small requests, allowing for concurrent processing and increased performance.

The given answer states that the RAID 3 configuration has a random read performance rating of 3, random write performance rating of 1, sequential read performance rating of 5, and sequential write performance rating of 3. This means that the RAID 3 performs moderately well in terms of random read and write operations, but has good sequential read performance and average sequential write performance.

The given answer indicates that the RAID 4 configuration has excellent random read and sequential read performance with a rating of 5, average random write performance with a rating of 3, and weak sequential write performance with a rating of 1. This suggests that the RAID 4 setup is optimized for reading data quickly and efficiently, but may struggle with writing data sequentially.

The correct answer is "konkurentne atomske transakcije." This answer suggests that the picture represents a scenario involving concurrent atomic transactions. Atomic transactions are indivisible and either complete successfully or are rolled back entirely. In this scenario, multiple transactions are executing concurrently, ensuring that each transaction is completed atomically without interference from other transactions. This approach helps maintain data consistency and integrity in a concurrent environment.

The correct answer is "security" because the image appears to be related to some form of security measures or systems. It could be depicting a security camera, a lock, or any other element commonly associated with security. Without further context or information, it is difficult to determine the exact meaning or purpose of the image, but "security" seems to be the most logical choice based on visual interpretation.

Under certain conditions, the process from domain D1 can copy its write permission to file F3 in domain D3.

In a RAID 1 configuration, data is mirrored across multiple drives. Each drive contains a complete copy of the data, which allows for redundancy and increased data protection. In this case, there are 4 disks in the RAID 1 configuration, meaning that there can be a maximum of 4 simultaneous read or write operations occurring at the same time. Therefore, the maximum degree of concurrency in this RAID 1 setup is 4.

This question is asking for the type of raid configuration. The correct answer is Raid 1. Raid 1, also known as mirroring, involves creating an exact copy of data on multiple drives. This provides redundancy and improves data protection as if one drive fails, the data can still be accessed from the mirrored drive.

The correct answer is "Proces P2 de poslati reply procesu P5" because it is the only statement that is consistent with the given messages. The first message states that process P2 will not send a reply to process P5, but will send a reply to the coordinator. The second message states that process P2 will send a reply to both process P5 and the coordinator. The third message states that process P2 will not send a reply to process P5. Therefore, the correct statement is that process P2 will send a reply to process P5.

In a RAID 0 configuration, data is striped across multiple disks without any redundancy or fault tolerance. This means that if any of the disks fail, the entire RAID array will be affected and data loss will occur. Therefore, the RAID 0 configuration cannot tolerate any disk failures and the answer is 0.

The correct answer is "P1 čeka na P2 da oslobodi resurs" because in the given scenario, P1 has a lower timestamp than P2 and according to the wait-die scheme, a process with a lower timestamp should wait for a process with a higher timestamp to release the resource. Therefore, P1 will wait for P2 to release the resource before proceeding.

Based on the information given, the statement "Transakcija sigurno dobija lock" means that the transaction definitely acquires the lock. This is because all previous transactions were read transactions, and the new transaction is requesting a share lock. In a database system, a share lock allows multiple transactions to read the data simultaneously, so there should be no conflict in granting the lock to the new transaction. Therefore, the new transaction will definitely acquire the lock.

The correct answer is "samo u drugoj fazi" because the question states that the coordinator Ci is requesting the stations to perform tasks. However, it specifies that this request is only made in the second phase, indicating that the coordinator does not require any tasks to be performed in the first phase. Therefore, the stations are only required to perform tasks in the second phase.

The RAID 0 configuration combines multiple disks into a single logical unit, distributing data across all the disks in the array. This striping technique improves performance as data can be read and written simultaneously from different disks. However, RAID 0 does not provide any redundancy or fault tolerance. Therefore, the storage efficiency in this case is 100%, as all the disk space is usable for data storage without any overhead for redundancy.

The given answer suggests that the RAID 1 configuration with four disks has a random read performance rating of 3, random write performance rating of 1, sequential read performance rating of 3, and sequential write performance rating of 3. This means that the RAID 1 setup has moderate random read and sequential read performance, but poor random write and sequential write performance.

The storage efficiency of RAID 4 is 75%. RAID 4 uses block-level striping with a dedicated parity disk. This means that for every set of data blocks, one disk is used for storing parity information. The remaining disks are used for data storage. In RAID 4, the parity information is distributed across all the disks, except for the dedicated parity disk. This allows for high data transfer rates, but it also means that the storage efficiency is not 100% since a portion of the storage capacity is used for storing parity information. In this case, 75% of the total disk capacity is available for data storage.

The correct answer is "checkpoint koji ubrzava vreme pročišćavanja log-a". This is because a checkpoint is a mechanism in a database system that helps ensure the consistency and durability of the data. It flushes the modified data from memory to disk and writes a record in the transaction log, which allows for faster recovery in case of a system failure. Therefore, a checkpoint that accelerates the process of cleaning the log would be beneficial for improving the performance and reliability of the database system.

The correct answer is "konkurentne atomske transakcije". This is because the given options are discussing different types of problems and approaches related to transactions. "konkurentne atomske transakcije" refers to concurrent atomic transactions, which means multiple transactions are executing simultaneously and each transaction is treated as an indivisible unit. The other options mention deadlock problem, fully-distributed approach, and centralized approach, which are not related to the concept of concurrent atomic transactions.

The correct answer is "Protection domene". The question asks what can be seen in the picture, and the options provided are different domains related to processes, security, objects, and protection. Based on the given options, the picture is showing the "Protection domene".

The correct answer is Deadlock problem, fully-distributed approach. This suggests that the image represents a scenario where a deadlock problem arises in a fully-distributed system. In a fully-distributed approach, resources are distributed across multiple nodes in a network, and deadlock occurs when two or more processes are unable to proceed because each is waiting for a resource held by another. This answer implies that the image depicts a situation where deadlock is a concern in a fully-distributed system.

The correct answer is "Statefull je brži, Stateless se brže oporavlja u slučaju privremenog otkaza." This means that a stateful service is faster, but a stateless service recovers more quickly in case of temporary failure.

In this technique, computers from the Internet have limited access to the DMZ.

The given scenario describes a situation where P3 is performing a roll-back operation. It is mentioned that P2 is also performing a roll-back operation. Additionally, P3 is waiting for P2 to release a resource. However, P3 decides to take the resource from P2 instead. This action suggests that P3 is prioritizing its own roll-back operation over waiting for P2, leading to the conclusion that P3 is the one performing the roll-back.

The correct answer is "Transakcija podatke dobija isključivo iz log-a" which means "Transaction obtains data exclusively from the log". This suggests that in the given scenario, the transaction only retrieves data from the log and not from the record Q or any other source.

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The answer "da" means "yes" in Serbian. Therefore, the explanation for this answer is that the process from domain D2 can set access rights for file F2 in domain D3.

The RAID 3 configuration is based on striping data across multiple disks and using a dedicated parity disk to store error correction information. In this case, there are four disks in the RAID 3 array. The correct answer of 1 indicates that only one disk can fail without causing the RAID to fail. This is because the parity data stored on the dedicated parity disk can be used to reconstruct the data from the failed disk.

The correct answer is "Transakcija upisuje podatke isključivo u log". This is because the statement in the question states that "Transakcija upisuje podatke u log-a kao u zapis Q", which translates to "The transaction writes data to the log like in record Q". This implies that the transaction only writes data to the log, not to any other location or record. Therefore, option 4 is the correct answer.

This naming convention, "hostname:FS:/directory path/filename," is typically used in a centralized operating system. In a centralized OS, all files and directories are stored and managed in a central location, usually on a server. The hostname in the naming convention refers to the name of the server where the file is located. The "FS" stands for file system, indicating that the file is stored in a specific file system. The directory path and filename provide the specific location and name of the file within the centralized system.

The correct answer is "Deadlock problem, centalized approach." This suggests that the image depicts a scenario related to a deadlock problem, where a centralized approach is being used to address the issue. A centralized approach typically involves a central authority or control mechanism that manages and coordinates the resources to prevent deadlocks.

The given answer of 1 suggests that the RAID 5 can tolerate the failure of one disk and still remain functional. This is because RAID 5 uses distributed parity across multiple disks, allowing for the reconstruction of data in the event of a single disk failure. Therefore, if one disk fails, the data can still be accessed and the RAID can continue to operate.

The given question is asking whether the process from domain D3 can transition into domain D2. The correct answer is "Da" which means "Yes" in English. This implies that the process from domain D3 can indeed transition into domain D2.

The correct answer is 50%. RAID 1, also known as mirroring, involves creating an exact copy of data on multiple disks. In this case, since there are four disks, only two of them are being used for data storage, while the other two are duplicates. Therefore, the storage efficiency is 50% because only half of the total disk capacity is available for data storage.

The correct answer states that the processes do not need to know each other, but they must know the coordinator. This means that the processes can communicate with the coordinator without directly communicating with each other.

In this scenario, when a machine performs a write operation to the master copy file, the server notifies all the machines that have a copy of the master to invalidate their cache. This means that the cache copies on those machines are no longer valid and need to be updated. This ensures that all machines have the most recent version of the master copy file.

The given answer states that the transaction definitely does not get the lock. This can be inferred from the information provided in the question, which states that there are already 3 read transactions in the base file. Since the new transaction is requesting an exclusive lock, it will not be able to obtain the lock because there are already other transactions accessing the file. Therefore, the transaction definitely does not get the lock.

In this technique, it is stated that computers with Internet access do not have direct access to company computers. This means that there is some sort of restriction or limitation in place that prevents computers with Internet access from directly accessing company computers.

RAID 0 is the correct answer. RAID 0, also known as striping, is a type of RAID configuration that splits data across multiple drives. It offers improved performance as data is written and read from multiple drives simultaneously. However, RAID 0 does not provide any fault tolerance or data redundancy. If one drive fails, all data on the RAID 0 array may be lost.

The correct answer is 100%. RAID 6 is a redundant array of independent disks that uses double parity, allowing for the failure of two disks without losing any data. This level of redundancy ensures that all data is protected, resulting in a storage efficiency of 100%.

The correct answer suggests that the problem depicted in the given image is related to the DME (Distributed Mutual Exclusion) problem and it is being approached using a fully-distributed approach. This means that the problem involves multiple processes or nodes in a distributed system trying to access a shared resource, and the solution is being implemented in a fully-distributed manner where each node independently manages its own access to the resource without relying on a central coordinator.

The given answer suggests that the RAID 5 configuration with four disks has a rating of 3 for random read performance (RR3), random write performance (RW3), sequential read performance (SR3), and sequential write performance (SW3). This indicates that the RAID 5 setup has average performance in all these aspects.

The correct answer is "DME problem, centralized approach." This suggests that the issue depicted in the image is related to DME (Data Management Entity) problem, which typically involves difficulties in managing and organizing data. Additionally, the approach taken to address this problem is centralized, meaning that a central authority or system is responsible for managing and controlling the data.

The correct answer is "Transakcija podatke može dobiti podatke iz log-a kao i iz zapisa Q." This means that the transaction can receive data from both the log and the Q record.

When a write operation is performed on the master copy in a stateless service with DFS implementation, the server only notifies the machine that has a copy of the master to invalidate its cache. This means that the server does not proactively inform all machines with a copy of the master to invalidate their cache. Instead, it only responds to requests from the specific machine that needs to invalidate its cache.

Raid 4 is the correct answer because it is a type of RAID (Redundant Array of Independent Disks) configuration that uses block-level striping with a dedicated parity disk. In Raid 4, data is striped across multiple disks, similar to Raid 0, but with the addition of a dedicated parity disk that stores information about the data on the other disks. This allows for fault tolerance and data recovery in case of a disk failure.

The correct answer is Raid 5 because it is the only option given in the list of choices. Raid 6, Raid 4, and Raid 3 are not mentioned as possible answers.

The maximum degree of concurrency for a RAID 3 with four disks is 3. This means that up to three disks can be accessed simultaneously in parallel, allowing for faster data transfer and improved performance. The fourth disk is used for parity, which provides redundancy and allows for data recovery in case of a disk failure.

In a RAID 1 configuration, also known as mirroring, data is duplicated across multiple disks. In this case, four disks are used. Since RAID 1 can tolerate the failure of one disk without losing any data, the FT (fault tolerance) rating would be the number of disks that can fail and still allow the RAID to function properly. In this scenario, the correct answer is 2, meaning that two disks can fail and the RAID will still be operational.

To obtain an exclusive lock in a base file, there should be no active transactions. This means that no transactions should be currently accessing or modifying the data in the file. Having no transactions ensures that the current transaction can have exclusive access to the data without any interference or conflicts from other transactions.

The maximum degree of concurrency for this RAID 4 configuration is 3. This means that up to 3 small requests can be processed simultaneously. RAID 4 uses block-level striping with a dedicated parity disk, which allows for parallel processing of multiple small requests. Each disk in the RAID can handle one small request at a time, and since there are 4 disks in this configuration, the maximum degree of concurrency is 3.

To obtain a share lock on the record R in the base file, it is sufficient that there is no write transaction. This means that as long as there are no write transactions accessing the record R, a transaction can acquire a share lock on it.

The RAID 6 configuration can tolerate the failure of two disks without losing any data. Therefore, the correct answer of 1 suggests that only one disk can fail and the RAID will still be able to survive and function properly.

The correct answer states that the transaction only writes data to the log. This means that the transaction does not write data to any other location or record, such as the Q record or any other file. It solely updates the log file with the necessary information.

Raid 0 is the correct answer because it is the only option that matches the given question "Koji je ovo Raid?" (Which Raid is this?). Raid 0 is a type of RAID (Redundant Array of Independent Disks) that uses striping without any redundancy. It offers improved performance by dividing data across multiple disks, but it does not provide any fault tolerance or data protection.

Raid 3 is the correct answer because it is a type of RAID (Redundant Array of Independent Disks) that uses striping with dedicated parity. It requires a minimum of three disks to implement, and it provides high data transfer rates and fault tolerance. In this RAID level, data is striped across multiple disks, and a single dedicated disk is used for storing parity information, which allows for data recovery in case of a disk failure.